getting ConTeXt results back to Lua (for typesetting solutions at end of document)

getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Sanjoy Mahajan]

Dear List,

I'm trying to have problem solutions automatically collected, each with
its corresponding problem number, e.g. 2.3, and then typeset at the end
of a document.  Thus, I imagine something like

\startproblem{A problem title}  % Problem 1.1
A question                

\startsolution
An answer
\stopsolution

\stopproblem

And then the solution(s) would appear at the end (with the "1.1"
remembered from when the problem was typeset):

  Solution to Problem 1.1.

  An answer

It seems that buffers are the way to do this.  But I cannot quite get
the automatic numbering to work.  The delayed evaluation and information
passing between lua and ConTeXt has me confused and tangled in a knot.

Below is a minimal almost-working example.  The issue is in the line

      {\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}

which ends up putting the verbatim string "\getnumber[problem]" into the
temp buffer, rather than the typeset result, which would be something
like 1.1 or 1.2.

I've read the cld-mkiv.pdf manual, but I must be missing a simple
solution to getting ConTeXt to send back the result of
\getnumber[problem].  I've also tried the analogous
context.getnumber({"problem"}), though without success.

Does anyone see what I am missing?

Many thanks!

-Sanjoy

\defineenumeration[problem]
                  [title=yes, text=Problem, way=bychapter, prefix=chapter]
\defineenumeration[solution][problem]
\setupenumeration [solution][text={Solution to problem}, number=no]

\def\test#1{[#1]}

% appendbuffer modified from Sietse Brouwer's on mailing list (Jan 15, 2013)
\startluacode
    userdata = userdata or { }
    function userdata.addTempToBuffer(buffername, problem)
        buffers.append(
            buffername,
            '\\startsolution{' .. problem .. '}\n' .. buffers.getcontent('APPENDTEMP') .. '\n\\stopsolution\n\n'
        )
    end
\stopluacode

\def\startappendbuffer[#1]%
  {\def\stopappendbuffer%
      {\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}
   \dostartbuffer[APPENDTEMP][startappendbuffer][stopappendbuffer]}

\starttext

\chapter{One}

\startproblem{Test}
  Test problem
\startappendbuffer[soln]
Solution
\stopappendbuffer
\stopproblem

\startproblem{Test}
Test problem
\startappendbuffer[soln]
Solution
\stopappendbuffer
\stopproblem

\typebuffer[soln]

\stoptext
___________________________________________________________________________________
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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Wolfgang Schuster]

Hi Sanjoy,

when you have a equal number of questions ans answers you can create a 
enumeration for each and collect the answers with the block mechanism.

At the end of the document you can flush the collected answers.

\defineblock [answer]

\defineenumeration [question]
\defineenumeration [answer]

\starttext

\startquestion
Question 1
\stopquestion

\beginanswer
\startanswer
Answer 1
\stopanswer
\endanswer

\startquestion
Question 2
\stopquestion

\beginanswer
\startanswer
Answer 2
\stopanswer
\endanswer

\page

\useblocks[answer]

\stoptext

Wolfgang


Sanjoy Mahajan schrieb am 31.01.19 um 22:51:
> Dear List,
> 
> I'm trying to have problem solutions automatically collected, each with
> its corresponding problem number, e.g. 2.3, and then typeset at the end
> of a document.  Thus, I imagine something like
> 
> \startproblem{A problem title}  % Problem 1.1
> A question
> 
> \startsolution
> An answer
> \stopsolution
> 
> \stopproblem
> 
> And then the solution(s) would appear at the end (with the "1.1"
> remembered from when the problem was typeset):
> 
>    Solution to Problem 1.1.
> 
>    An answer
> 
> It seems that buffers are the way to do this.  But I cannot quite get
> the automatic numbering to work.  The delayed evaluation and information
> passing between lua and ConTeXt has me confused and tangled in a knot.
> 
> Below is a minimal almost-working example.  The issue is in the line
> 
>        {\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}
> 
> which ends up putting the verbatim string "\getnumber[problem]" into the
> temp buffer, rather than the typeset result, which would be something
> like 1.1 or 1.2.
> 
> I've read the cld-mkiv.pdf manual, but I must be missing a simple
> solution to getting ConTeXt to send back the result of
> \getnumber[problem].  I've also tried the analogous
> context.getnumber({"problem"}), though without success.
> 
> Does anyone see what I am missing?
> 
> Many thanks!
> 
> -Sanjoy
> 
> \defineenumeration[problem]
>                    [title=yes, text=Problem, way=bychapter, prefix=chapter]
> \defineenumeration[solution][problem]
> \setupenumeration [solution][text={Solution to problem}, number=no]
> 
> \def\test#1{[#1]}
> 
> % appendbuffer modified from Sietse Brouwer's on mailing list (Jan 15, 2013)
> \startluacode
>      userdata = userdata or { }
>      function userdata.addTempToBuffer(buffername, problem)
>          buffers.append(
>              buffername,
>              '\\startsolution{' .. problem .. '}\n' .. buffers.getcontent('APPENDTEMP') .. '\n\\stopsolution\n\n'
>          )
>      end
> \stopluacode
> 
> \def\startappendbuffer[#1]%
>    {\def\stopappendbuffer%
>        {\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}
>     \dostartbuffer[APPENDTEMP][startappendbuffer][stopappendbuffer]}
> 
> \starttext
> 
> \chapter{One}
> 
> \startproblem{Test}
>    Test problem
> \startappendbuffer[soln]
> Solution
> \stopappendbuffer
> \stopproblem
> 
> \startproblem{Test}
> Test problem
> \startappendbuffer[soln]
> Solution
> \stopappendbuffer
> \stopproblem
> 
> \typebuffer[soln]
> 
> \stoptext
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
> 
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Weber, Matthias]

A while back I asked a similar question, and Hans pointed out the following which I still use:

\defineenumeration
 [exercise]
 [way=bysection,
  text=Exercise,
  coupling=solution,
  location=hanging]

\defineenumeration
 [solution]
 [text=Solution,
  way=bysection,
  coupling=exercise,
  location=hanging]

\defineblock[exercise]
\defineblock[solution]
\hideblocks[solution]

\setupinteraction
 [state=start]

\starttext

\section{Main Text}

\subsection[subsec:1]{problem section 1}

\startexercise
Addition\index{addition} problem: $1+1=?$ 
\stopexercise

\beginsolution[one]
\startsolution
Answer: 2. 
\stopsolution
\endsolution

\subsection[subsec:2]{problem section 2}

\startexercise
Multiplication problem: $1\times1=?$
\stopexercise

\beginsolution[two]
\startsolution
Answer: 1.
\stopsolution
\endsolution

\page

%\reset[solution]

\section{Answers to the Problems}

\subsection{Answers to \in{section}[subsec:1]}

\useblocks[solution][one]

\subsection{Answers to \in{section}[subsec:2]}

\useblocks[solution][two]

\stoptext


> On Jan 31, 2019, at 5:02 PM, Wolfgang Schuster <wolfgang.schuster.lists@gmail.com> wrote:
> 
> Hi Sanjoy,
> 
> when you have a equal number of questions ans answers you can create a enumeration for each and collect the answers with the block mechanism.
> 
> At the end of the document you can flush the collected answers.
> 
> \defineblock [answer]
> 
> \defineenumeration [question]
> \defineenumeration [answer]
> 
> \starttext
> 
> \startquestion
> Question 1
> \stopquestion
> 
> \beginanswer
> \startanswer
> Answer 1
> \stopanswer
> \endanswer
> 
> \startquestion
> Question 2
> \stopquestion
> 
> \beginanswer
> \startanswer
> Answer 2
> \stopanswer
> \endanswer
> 
> \page
> 
> \useblocks[answer]
> 
> \stoptext
> 
> Wolfgang
> 
> 
> Sanjoy Mahajan schrieb am 31.01.19 um 22:51:
>> Dear List,
>> I'm trying to have problem solutions automatically collected, each with
>> its corresponding problem number, e.g. 2.3, and then typeset at the end
>> of a document.  Thus, I imagine something like
>> \startproblem{A problem title}  % Problem 1.1
>> A question
>> \startsolution
>> An answer
>> \stopsolution
>> \stopproblem
>> And then the solution(s) would appear at the end (with the "1.1"
>> remembered from when the problem was typeset):
>>   Solution to Problem 1.1.
>>   An answer
>> It seems that buffers are the way to do this.  But I cannot quite get
>> the automatic numbering to work.  The delayed evaluation and information
>> passing between lua and ConTeXt has me confused and tangled in a knot.
>> Below is a minimal almost-working example.  The issue is in the line
>>       {\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}
>> which ends up putting the verbatim string "\getnumber[problem]" into the
>> temp buffer, rather than the typeset result, which would be something
>> like 1.1 or 1.2.
>> I've read the cld-mkiv.pdf manual, but I must be missing a simple
>> solution to getting ConTeXt to send back the result of
>> \getnumber[problem].  I've also tried the analogous
>> context.getnumber({"problem"}), though without success.
>> Does anyone see what I am missing?
>> Many thanks!
>> -Sanjoy
>> \defineenumeration[problem]
>>                   [title=yes, text=Problem, way=bychapter, prefix=chapter]
>> \defineenumeration[solution][problem]
>> \setupenumeration [solution][text={Solution to problem}, number=no]
>> \def\test#1{[#1]}
>> % appendbuffer modified from Sietse Brouwer's on mailing list (Jan 15, 2013)
>> \startluacode
>>     userdata = userdata or { }
>>     function userdata.addTempToBuffer(buffername, problem)
>>         buffers.append(
>>             buffername,
>>             '\\startsolution{' .. problem .. '}\n' .. buffers.getcontent('APPENDTEMP') .. '\n\\stopsolution\n\n'
>>         )
>>     end
>> \stopluacode
>> \def\startappendbuffer[#1]%
>>   {\def\stopappendbuffer%
>>       {\ctxlua{userdata.addTempToBuffer('#1', [==[\getnumber[problem]]==])}}
>>    \dostartbuffer[APPENDTEMP][startappendbuffer][stopappendbuffer]}
>> \starttext
>> \chapter{One}
>> \startproblem{Test}
>>   Test problem
>> \startappendbuffer[soln]
>> Solution
>> \stopappendbuffer
>> \stopproblem
>> \startproblem{Test}
>> Test problem
>> \startappendbuffer[soln]
>> Solution
>> \stopappendbuffer
>> \stopproblem
>> \typebuffer[soln]
>> \stoptext
>> ___________________________________________________________________________________
>> If your question is of interest to others as well, please add an entry to the Wiki!
>> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
>> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
>> archive  : https://bitbucket.org/phg/context-mirror/commits/
>> wiki     : http://contextgarden.net
>> ___________________________________________________________________________________
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________

___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Sanjoy Mahajan]

Thank you, Matthias and Wolfgang, for the examples/solutions.

If I understand them right, there must be one solution for each exercise
(otherwise the solution numbering gets out of sync).  Or do the
coupling= options in Matthias's example remove that restriction?  In my
experiments with the examples, deleting the first solution
unsynchronized the exercise--solution numbering, no matter how I fiddled
with the coupling keys.

In the ideal pedagogical world, I'd write a solution for each exercise.
But reality might intervene, so I still wonder if the solutions can
automatically know and include the exercise number (perhaps by placing
\startanswer..\stopanswer inside \startexercise..\stopexercise and using
\getnumber[exercise]).  If there is a clever way, that's great.  But,
the nature of TeX as a macro language may preclude the \getnumber code
being evaluated just when one wants.

Regards,
-Sanjoy
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Alan Braslau]

On Thu, 31 Jan 2019 22:10:40 -0500
Sanjoy Mahajan <sanjoy@olin.edu> wrote:

> Thank you, Matthias and Wolfgang, for the examples/solutions.

Why not use the list mechanism?

Alan
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Mikael P. Sundqvist]

Hi,

this is what I learned from the list to use. I'm sorry, but the names
sound a bit Swedish, but I'm sure you can change that. This way it was
also easy to add different types like hints, answers and solutions and
get clickable letters accordingly.

/Mikael

%Test file
\setupinteraction[state=start,color=,contrastcolor=,style=]

\define[1]\problemtextmakro
 {%
  \doifreferencefoundelse{losn:\currentconstructionreference}
     {\llap{\goto{{\WORD l}}[losn:\currentconstructionreference]}\,}
     {}%
  #1
  }

\defineenumeration[problem][
referenceprefix=problem,
text=,
width=fit,
numbercommand=\problemtextmakro,
number=yes,
alternative=serried,
hang=margin,
indentnext=auto,
indenting={yes,small},
prefix=yes,
prefixsegments=chapter,
way=bychapter,
]


\defineblock[losn]
\hideblocks[losn]


\define[1]\losntextmakro
  {\doifreferencefoundelse{problem:\currentconstructionreference}
     {\bf \goto{\WORD{\in[problem:\currentconstructionreference]}}[problem:\currentconstructionreference]}
     {}
  }


\defineenumeration[losning][
referenceprefix=losn,
numbercommand=\losntextmakro,
text=,
headstyle=,
title=yes,
titlestyle=,
alternative=serried,
width=fit,
number=no,
indentnext=auto,
indenting={yes,medium},
before={\blank[halfline]},
after={\blank[halfline]},
]



\starttext

\chapter{Problems}

\startproblem[p:cont]
Show that all functions are continuous.
\stopproblem

\beginlosn
\startlosning[p:cont]
All functions are continuous\ldots
\stoplosning
\endlosn

\startproblem
This is a problem without solution
\stopproblem

\startproblem[p:diff]
Show that all functions are differentiable.
\stopproblem

\beginlosn
\startlosning[p:diff]
All functions are differentiable\ldots
\stoplosning
\endlosn


\beginlosn
\startlosning[p:diff]
This is a second solution to~\in[p:diff].\ldots
\stoplosning
\endlosn

\chapter{Solutions}

\selectblocks[losn][criterium=all]

On Fri, Feb 1, 2019 at 5:20 AM Alan Braslau <braslau.list@comcast.net> wrote:
>
> On Thu, 31 Jan 2019 22:10:40 -0500
> Sanjoy Mahajan <sanjoy@olin.edu> wrote:
>
> > Thank you, Matthias and Wolfgang, for the examples/solutions.
>
> Why not use the list mechanism?
>
> Alan
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
>
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________
___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Otared Kavian]

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Hi Sanjoy,

Two or three years ago Wolfgang helped me to solve an analogous question. Here is an example which works fine, and moreover one can navigate from a question to its hint (if there is one…) and then from the hint to its solution (if present…).

Best regards: OK

%%%% begin interactive-question-hint-answer.tex
%%%% Here, following Wolfgang Schuster's ideas, 
%%%% we define some macros allowing to couple
%%%% Questions, Hints and Answers in an automatic way
%%%% Upon clicking on an interactive title for Question, Hint or Answer
%%%% one goes to the corresponding Hint, Answer or Question

\setupinteraction[state=start]

% We define two counters which follow the numbers
% appearing in Question and Answer

\newcounter\QuestionCounter
\newcounter\HintCounter
\newcounter\AnswerCounter

% We create two commands to be used in the
% enumeration environments
% Note that the check for trial typestting 
% \doifnotmode{*trialtypesetting}
% is necessary in order to avoid unwanted incrementation
\define[1]\QuestionTextCommand
  {\doifnotmode{*trialtypesetting}
     {\doglobal\increment\QuestionCounter
      \pagereference[question:\QuestionCounter]}%
   \doifreferencefoundelse{hint:\QuestionCounter}
     {\goto{#1}[hint:\QuestionCounter]}
     {#1}}

\define[1]\HintTextCommand
  {\doifnotmode{*trialtypesetting}
     {\doglobal\increment\HintCounter
      \pagereference[hint:\HintCounter]}%
   \doifreferencefoundelse{answer:\QuestionCounter}
     {\goto{#1}[answer:\QuestionCounter]}
     {#1}}

\define[1]\AnswerTextCommand
  {\doifnotmode{*trialtypesetting}
     {\doglobal\increment\AnswerCounter
      \pagereference[answer:\AnswerCounter]}%
   \doifreferencefoundelse{question:\AnswerCounter}
     {\goto{#1}[question:\AnswerCounter]}
     {#1}}

% We define here two enumeration environments for
% Questions and Answers
\defineenumeration[question]
	[text=Question,
	headcommand=\QuestionTextCommand,
	number=yes,
	prefix=yes,
	prefixsegments=chapter,
	coupling=hint]

\defineenumeration[hint]
	[text=Hint,
	headcommand=\HintTextCommand,
	number=yes,
	prefix=yes,
	prefixsegments=chapter,
	coupling=answer]
	
\defineenumeration[answer]
	[text=Answer,
	headcommand=\AnswerTextCommand,
	number=yes,
	prefix=yes,
	prefixsegments=chapter,
	coupling=question]

% Each question is followed immediately by its answer.
% The answers are put in a block which will be used later
\defineblock[hint]
\hideblocks[hint]

\defineblock[answer]
\hideblocks[answer]

% We define a command used after a  
% Question for which no Answer is provided
% Since the block commands 
% \beginanswer ... \endanswer
% cannot be used directly in a macro definition
% we use a trick...
% In the buffer the two counters associated to Answer
% are incremented...
\startbuffer[noanswer]
    \beginhint
    \doglobal\increment\HintCounter
    \incrementcounter[hint]
    \endhint
    \beginanswer
    \doglobal\increment\AnswerCounter
    \incrementcounter[answer]
    \endanswer
\stopbuffer

% ...and then the above buffer is invoked
\define\noanswer
  {\getbuffer[noanswer]}

% example of use:
\starttext
\startchapter[title=Questions]

\startquestion[q:1]
Prove that ${\rm e}\sim 2.73$ is irrational.
    
This is the first question, with its own reference, for later use.
\stopquestion

\beginhint
\starthint
Write ${\rm e}$ as a series.
\stophint
\endhint

\beginanswer
\startanswer
This is the answer to the first question (to \in{Question}[q:1]).
\stopanswer
\endanswer

\startquestion 
This is the second question, without its own reference.
\stopquestion

\beginhint
\starthint
Do you really need a hint? :-)
\stophint
\endhint

\beginanswer
\startanswer[a:Test]
This is the answer to the second question. 

(Note that this answer has a reference named \type{a:Test}).
\stopanswer
\endanswer

\startquestion[q:Obvious]
This is the third question, an easy one, without a given solution.
\stopquestion

% we increment here the counters for Answer
\noanswer

\startquestion[q:2]
This is the fourth question with its own reference.
\stopquestion

\beginhint
\starthint
Do you really need a hint? :-)
\stophint
\endhint

\beginanswer
\startanswer
This is the answer to the fourth question: use the result of \in{Question}[q:1].
\stopanswer
\endanswer

\startquestion 
This is the fifth question, without its own reference. 

({\it Hint:} look again at \in{Question}[q:Obvious]).
\stopquestion

\beginhint
\starthint
Do you really need a hint? :-)
\stophint
\endhint

\beginanswer
\startanswer
This is the answer to the fifth question. Read again \in{Answer}[a:Test].
\stopanswer
\endanswer  

\stopchapter

% Here we say ownnumber=1, in order to match the prefix 
% of numbers associated to Answer
\startchapter[ownnumber=1,title=Hints]
\useblocks[hint]
\stopchapter

\startchapter[ownnumber=1,title=Answers and solutions]
\useblocks[answer]
\stopchapter

\stoptext
%%%% end interactive-question-hint-answer.tex


> On 1 Feb 2019, at 04:10, Sanjoy Mahajan <sanjoy@olin.edu> wrote:
> 
> Thank you, Matthias and Wolfgang, for the examples/solutions.
> 
> If I understand them right, there must be one solution for each exercise
> (otherwise the solution numbering gets out of sync).  Or do the
> coupling= options in Matthias's example remove that restriction?  In my
> experiments with the examples, deleting the first solution
> unsynchronized the exercise--solution numbering, no matter how I fiddled
> with the coupling keys.
> 
> In the ideal pedagogical world, I'd write a solution for each exercise.
> But reality might intervene, so I still wonder if the solutions can
> automatically know and include the exercise number (perhaps by placing
> \startanswer..\stopanswer inside \startexercise..\stopexercise and using
> \getnumber[exercise]).  If there is a clever way, that's great.  But,
> the nature of TeX as a macro language may preclude the \getnumber code
> being evaluated just when one wants.
> 
> Regards,
> -Sanjoy
> ___________________________________________________________________________________
> If your question is of interest to others as well, please add an entry to the Wiki!
> 
> maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
> webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
> archive  : https://bitbucket.org/phg/context-mirror/commits/
> wiki     : http://contextgarden.net
> ___________________________________________________________________________________


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___________________________________________________________________________________
If your question is of interest to others as well, please add an entry to the Wiki!

maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://context.aanhet.net
archive  : https://bitbucket.org/phg/context-mirror/commits/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Hans Hagen]

On 2/1/2019 4:10 AM, Sanjoy Mahajan wrote:
> Thank you, Matthias and Wolfgang, for the examples/solutions.
> 
> If I understand them right, there must be one solution for each exercise
> (otherwise the solution numbering gets out of sync).  Or do the
> coupling= options in Matthias's example remove that restriction?  In my
> experiments with the examples, deleting the first solution
> unsynchronized the exercise--solution numbering, no matter how I fiddled
> with the coupling keys.
> 
> In the ideal pedagogical world, I'd write a solution for each exercise.
> But reality might intervene, so I still wonder if the solutions can
> automatically know and include the exercise number (perhaps by placing
> \startanswer..\stopanswer inside \startexercise..\stopexercise and using
> \getnumber[exercise]).  If there is a clever way, that's great.  But,
> the nature of TeX as a macro language may preclude the \getnumber code
> being evaluated just when one wants.
given that context originally was made for typesetting educational 
materials including questions, answers, explanations ... how about 
looking at the 'blocks' mechanism (there are some examples in the test 
suite under blocks)

Hans

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Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Sanjoy Mahajan]

On 2019-02-01 09:48, Hans Hagen <j.hagen@xs4all.nl> wrote:

> given that context originally was made for typesetting educational
> materials including questions, answers, explanations ... how about
> looking at the 'blocks' mechanism (there are some examples in the test
> suite under blocks)

They are very helpful; thank you.  Those and Mikail's example are also
inspiring me to provide a hint and a solution for each problem, not just
a solution.

By the way, in the test suite (from the PRAGMA site), blocks-001.tex
crashes the 2019.01.28 beta here on my Debian amd64 system, with the
following error on the terminal (no log file is even produced):

 $ mycontext blocks-001.tex
 /home/sanjoy/context/2019.01.28-beta/tex/texmf-linux-64/bin/context
 /home/sanjoy/context/2019.01.28-beta/tex/texmf-linux-64/bin/luatex
 ...ta/tex/texmf-context/scripts/context/lua/mtx-context.lua:427: attempt to call a nil value (global 'restart')

(The two file paths that are printed first are for my own debugging,
 to ensure that the run is using the context and luatex binaries from
 the minimals installation.)

The culprit seems to be the "% engine=luatex" first line.  At least,
deleting it fixes the problem.  Meanwhile, blocks-003.tex doesn't have
it, and it runs fine.

About the test-suite wiki page...actually, I'll start a new thread for
that topic as it's not directly related to problems/solutions/blocks.

-Sanjoy
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Re: [DKIM Failure] Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[Sanjoy Mahajan]

On 2019-02-01 07:58, "Mikael P. Sundqvist" <mickep@gmail.com> wrote:

> this is what I learned from the list to use. I'm sorry, but the names
> sound a bit Swedish, but I'm sure you can change that. 

The Swedish is not a problem.  Swedish, like Dutch, seems to be (English
+ German)/2.  Or sqrt(English*German) if, like me, you prefer the
geometric mean.

> This way it was also easy to add different types like hints, answers
> and solutions and get clickable letters accordingly.

Thank you.  I'll incorporate pieces into my setups.  If it ends up an
improvement over what's on the wiki, I'll also wikify.

-Sanjoy
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Re: [DKIM Failure] Re: getting ConTeXt results back to Lua (for typesetting solutions at end of document)

[r.ermers]

What you probably mean is that Swedish, German, Dutch and English are Indo-European Germanic languages which have much in common.

This cannot be expressed in terms of blends, products or square roots from one another.

What they do have is a common root, like

\sqrt(indo-european) $x$ w = Swedish,
\sqrt(indo-european) $x$ x = Dutch, 
\sqrt(indo-european) $x$ y = German, 
\sqrt(indo-european) $x$ z + Latin + French = English,

etc.

And yes, Sanskrit, Farsi, Kurdish, Urdu and Hindi are indo-European languages too, each in their own right.

Robert


> Op 1 feb. 2019, om 17:16 heeft Sanjoy Mahajan <sanjoy@olin.edu> het volgende geschreven:
> 
> On 2019-02-01 07:58, "Mikael P. Sundqvist" <mickep@gmail.com> wrote:
> 
>> this is what I learned from the list to use. I'm sorry, but the names
>> sound a bit Swedish, but I'm sure you can change that. 
> 
> The Swedish is not a problem.  Swedish, like Dutch, seems to be (English
> + German)/2.  Or sqrt(English*German) if, like me, you prefer the
> geometric mean.
> 
>> This way it was also easy to add different types like hints, answers
>> and solutions and get clickable letters accordingly.
> 
> Thank you.  I'll incorporate pieces into my setups.  If it ends up an
> improvement over what's on the wiki, I'll also wikify.
> 
> -Sanjoy
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> If your question is of interest to others as well, please add an entry to the Wiki!
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> ___________________________________________________________________________________

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