* Dividing dimensions
@ 2009-03-21 22:08 Aditya Mahajan
2009-03-21 22:26 ` Arthur Reutenauer
` (2 more replies)
0 siblings, 3 replies; 16+ messages in thread
From: Aditya Mahajan @ 2009-03-21 22:08 UTC (permalink / raw)
To: mailing list for ConTeXt users
Hi,
Can I divide dimensions to get a number in pdftex?
I have four dimensions \!!dimena, \!!dimenb, \!!dimenc and \!!dimend, and
I want
if (dimena/dimenb) > (dimenc/dimend)
do something
else
do otherthing
Any hints on how to do this in ConTeXt.
Thanks,
Aditya
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^ permalink raw reply [flat|nested] 16+ messages in thread* Re: Dividing dimensions
2009-03-21 22:08 Dividing dimensions Aditya Mahajan
@ 2009-03-21 22:26 ` Arthur Reutenauer
2009-03-21 22:41 ` Wolfgang Schuster
2009-03-22 8:38 ` Wolfgang Schuster
2009-03-22 0:02 ` Marcin Borkowski
2009-03-22 9:41 ` Hans Hagen
2 siblings, 2 replies; 16+ messages in thread
From: Arthur Reutenauer @ 2009-03-21 22:26 UTC (permalink / raw)
To: Mailing list for ConTeXt users
> Can I divide dimensions to get a number in pdftex?
LaTeX has a package to do exactly that, fp. You could look into its
code. Or you could use LuaTeX :-)
Arthur
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-21 22:26 ` Arthur Reutenauer
@ 2009-03-21 22:41 ` Wolfgang Schuster
2009-03-21 22:49 ` Aditya Mahajan
2009-03-23 7:15 ` Alan BRASLAU
2009-03-22 8:38 ` Wolfgang Schuster
1 sibling, 2 replies; 16+ messages in thread
From: Wolfgang Schuster @ 2009-03-21 22:41 UTC (permalink / raw)
To: Mailing list for ConTeXt users
Am 21.03.2009 um 23:26 schrieb Arthur Reutenauer:
>> Can I divide dimensions to get a number in pdftex?
>
> LaTeX has a package to do exactly that, fp. You could look into its
> code. Or you could use LuaTeX :-)
It's easy to do with etex but I would use lua if possible.
\starttext
\unprotect
\!!dimena=1cm
\!!dimenb=2cm
\!!dimenc=1cm
\!!dimend=3cm
\ifdim\dimexpr\!!dimena*100/\!!dimenb\relax>\dimexpr\!!dimenc*100/\!!
dimend\relax
this
\else
that
\fi
\!!dimend=1cm
\ifdim\dimexpr\!!dimena*100/\!!dimenb\relax>\dimexpr\!!dimenc*100/\!!
dimend\relax
this
\else
that
\fi
\protect
\stoptext
Wolfgang
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^ permalink raw reply [flat|nested] 16+ messages in thread* Re: Dividing dimensions
2009-03-21 22:41 ` Wolfgang Schuster
@ 2009-03-21 22:49 ` Aditya Mahajan
2009-03-21 23:00 ` Wolfgang Schuster
2009-03-23 7:15 ` Alan BRASLAU
1 sibling, 1 reply; 16+ messages in thread
From: Aditya Mahajan @ 2009-03-21 22:49 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Sat, 21 Mar 2009, Wolfgang Schuster wrote:
>
> Am 21.03.2009 um 23:26 schrieb Arthur Reutenauer:
>
>>> Can I divide dimensions to get a number in pdftex?
>>
>> LaTeX has a package to do exactly that, fp. You could look into its
>> code. Or you could use LuaTeX :-)
>
>
> It's easy to do with etex but I would use lua if possible.
>
> \starttext
> \unprotect
>
> \!!dimena=1cm
> \!!dimenb=2cm
> \!!dimenc=1cm
> \!!dimend=3cm
>
> \ifdim\dimexpr\!!dimena*100/\!!dimenb\relax>\dimexpr\!!dimenc*100/\!!dimend\relax
> this
> \else
> that
> \fi
Ah. I was using \dimexpr\!!dimena/\!!dimenb with crazy results. So the
trick is to mulitply by a number in between. Thanks Wolfgang.
Aditya
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-21 22:41 ` Wolfgang Schuster
2009-03-21 22:49 ` Aditya Mahajan
@ 2009-03-23 7:15 ` Alan BRASLAU
2009-03-23 11:35 ` Arthur Reutenauer
2009-03-23 12:12 ` Wolfgang Schuster
1 sibling, 2 replies; 16+ messages in thread
From: Alan BRASLAU @ 2009-03-23 7:15 UTC (permalink / raw)
To: ntg-context
Can someone explain this?
The solutions posted in lua seem more complicated
than that using \dimexpr
I will add further examples to
http://wiki.contextgarden.net/Expressions
(or someone else can do this directly, of course)
once I understand the advantages and limitations.
Alan
On Saturday 21 March 2009 23:41:19 Wolfgang Schuster wrote:
> >> Can I divide dimensions to get a number in pdftex?
> >
> > LaTeX has a package to do exactly that, fp. You could look into its
> > code. Or you could use LuaTeX :-)
>
> It's easy to do with etex but I would use lua if possible
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-23 7:15 ` Alan BRASLAU
@ 2009-03-23 11:35 ` Arthur Reutenauer
2009-03-23 12:12 ` Wolfgang Schuster
1 sibling, 0 replies; 16+ messages in thread
From: Arthur Reutenauer @ 2009-03-23 11:35 UTC (permalink / raw)
To: Mailing list for ConTeXt users
> Can someone explain this?
tex.dimen is a Lua table containing the dimension registers, in scaled
points. Hence, if \!!dimena is 1pt, tex.dimen["!!dimena"] will be 65536,
for instance. The rest is algebra and Lua control structures.
> The solutions posted in lua seem more complicated
> than that using \dimexpr
If you mean from the number of characters, maybe. Then again, it's
only about comparing a / b to c / d in both cases. It would be
interesting to compare their efficiency.
Arthur
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-23 7:15 ` Alan BRASLAU
2009-03-23 11:35 ` Arthur Reutenauer
@ 2009-03-23 12:12 ` Wolfgang Schuster
2009-03-23 12:22 ` Arthur Reutenauer
2009-03-23 23:27 ` Alan BRASLAU
1 sibling, 2 replies; 16+ messages in thread
From: Wolfgang Schuster @ 2009-03-23 12:12 UTC (permalink / raw)
To: mailing list for ConTeXt users
Am 23.03.2009 um 08:15 schrieb Alan BRASLAU:
> Can someone explain this?
> The solutions posted in lua seem more complicated
> than that using \dimexpr
>
> I will add further examples to
> http://wiki.contextgarden.net/Expressions
> (or someone else can do this directly, of course)
> once I understand the advantages and limitations.
Here is a example document.
Wolfgang
\starttext
\setupwhitespace[line]
Our todays question is how to divide two dimension and compare their
result with the result of another division, to do this we assign values
two four dimensions.
\startbuffer
\dimen0=15pt
\dimen2=20pt
\dimen4=15pt
\dimen6=30pt
\stopbuffer
\typebuffer \getbuffer
Because we can use \ETEX\ functions with \CONTEXT\ let's try to use
them,
the following example should work:
\startbuffer
\ifdim\dimexpr\dimen0/\dimen2\relax<\dimexpr\dimen4/\dimen6\relax
Second number is bigger.
\else
First number is bigger.
\fi
\stopbuffer
\typebuffer \getbuffer
This seems to be working but did it also work when the first result of
the second division is bigger.
\startbuffer
\dimen6=15pt
\ifdim\dimexpr\dimen0/\dimen2\relax<\dimexpr\dimen4/\dimen6\relax
Second number is bigger.
\else
First number is bigger.
\fi
\stopbuffer
\typebuffer \getbuffer
This seems to be weird because we still get as result that the first
number
is bigger but why did this happen? Let's take a closer look at the
real values
of the dimensions and their results after the divison.
Dimen0 has a value of \the\dimen0{} which is \number\dimen0{} in
scaled points.
Only the second value in scaled points is important for our
calculation, we wan't
to also know what the value of the second dimensions is: \number
\dimen2. The last
we want to know is the result of the division from the two number,
this is
\number\dimexpr\dimen0/\dimen2\relax.
Before I want to say if this number is or good let's see what the
value of
the second number is before we changed the value for dimension 6 and
after
we changed it:
\startlines
Before: \dimen6=30pt \number\dimexpr\dimen4/\dimen6\relax
After: \dimen6=15pt \number\dimexpr\dimen4/\dimen6\relax
\stoplines
The result is always 1 and not very helpful for us, you can see, if
you to divide
two number which are nearly equal the result in \TEX\ is not ver
helpful, to compensate
this we can multiply the first number in the division to get a better
result.
We try this first with the pure number before we include this in the
\type{\ifdim}
text we wanted.
\startlines
Result 1: \number\dimexpr\dimen0*100/\dimen2\relax
Result 2: \number\dimexpr\dimen4*100/\dimen6\relax
\stoplines
This gives us now to higher number we can compare with reliable results.
We will now try to test both this with our number above again.
\startbuffer
\dimen6=30pt
\ifdim\dimexpr\dimen0*100/\dimen2\relax<\dimexpr
\dimen4*100/\dimen6\relax
Second number is bigger.
\else
First number is bigger.
\fi
\stopbuffer
\typebuffer \getbuffer
\startbuffer
\dimen6=15pt
\ifdim\dimexpr\dimen0*100/\dimen2\relax<\dimexpr
\dimen4*100/\dimen6\relax
Second number is bigger.
\else
First number is bigger.
\fi
\stopbuffer
\typebuffer \getbuffer
You can see both tests give us a correct result after we multiplied
the first
number in each division by 100 but should we rely on such limitations
in \TEX\
when we can also use \LUATEX\ to get a correct result.
The \type{tex.dimen} function allows us to access the dimen register
from \TEX\ in Lua.
\startbuffer
\dimen6=30pt
\startluacode
if tex.dimen[0] / tex.dimen[2] < tex.dimen[4] / tex.dimen[6] then
tex.sprint("Second number is bigger.")
else
tex.sprint("First number is bigger.")
end
\stopluacode
\stopbuffer
\typebuffer \getbuffer
\startbuffer
\dimen6=15pt
\startluacode
if tex.dimen[0] / tex.dimen[2] < tex.dimen[4] / tex.dimen[6] then
tex.sprint("Second number is bigger.")
else
tex.sprint("First number is bigger.")
end
\stopluacode
\stopbuffer
\typebuffer \getbuffer
The output is now correct in both values without any tricks.
\stoptext
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^ permalink raw reply [flat|nested] 16+ messages in thread* Re: Dividing dimensions
2009-03-23 12:12 ` Wolfgang Schuster
@ 2009-03-23 12:22 ` Arthur Reutenauer
2009-03-23 23:27 ` Alan BRASLAU
1 sibling, 0 replies; 16+ messages in thread
From: Arthur Reutenauer @ 2009-03-23 12:22 UTC (permalink / raw)
To: Mailing list for ConTeXt users
Hello Wolfgang,
Thanks for the detailed explanation.
> The \type{tex.dimen} function allows us to access the dimen register from
> \TEX\ in Lua.
A small correction: it's not a function, it really behaves like a
table in Lua. You can use both the register number, or the symbolic
name (as defined by \dimendef, if applicable), as a key to the table.
Arthur
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^ permalink raw reply [flat|nested] 16+ messages in thread* Re: Dividing dimensions
2009-03-23 12:12 ` Wolfgang Schuster
2009-03-23 12:22 ` Arthur Reutenauer
@ 2009-03-23 23:27 ` Alan BRASLAU
2009-03-24 6:51 ` Mojca Miklavec
1 sibling, 1 reply; 16+ messages in thread
From: Alan BRASLAU @ 2009-03-23 23:27 UTC (permalink / raw)
To: ntg-context
Great!
I added a section to the wiki
http://wiki.contextgarden.net/Expressions
taking liberties to modify the presentation slightly.
A few points are broken, though,
notably that the online ConTeXt doesn't appear to do luacode...
Alan
On Monday 23 March 2009 13:12:54 Wolfgang Schuster wrote:
> Here is a example document.
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-23 23:27 ` Alan BRASLAU
@ 2009-03-24 6:51 ` Mojca Miklavec
2009-03-24 7:07 ` Hans Hagen
0 siblings, 1 reply; 16+ messages in thread
From: Mojca Miklavec @ 2009-03-24 6:51 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Tue, Mar 24, 2009 at 00:27, Alan BRASLAU wrote:
> Great!
> I added a section to the wiki
> http://wiki.contextgarden.net/Expressions
> taking liberties to modify the presentation slightly.
>
> A few points are broken, though,
> notably that the online ConTeXt doesn't appear to do luacode...
True. We don't want users to experiment with os.execute.
Mojca
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-24 6:51 ` Mojca Miklavec
@ 2009-03-24 7:07 ` Hans Hagen
0 siblings, 0 replies; 16+ messages in thread
From: Hans Hagen @ 2009-03-24 7:07 UTC (permalink / raw)
To: mailing list for ConTeXt users
Mojca Miklavec wrote:
> On Tue, Mar 24, 2009 at 00:27, Alan BRASLAU wrote:
>> Great!
>> I added a section to the wiki
>> http://wiki.contextgarden.net/Expressions
>> taking liberties to modify the presentation slightly.
>>
>> A few points are broken, though,
>> notably that the online ConTeXt doesn't appear to do luacode...
>
> True. We don't want users to experiment with os.execute.
actually, the code for a more secure handling has been present from the
start ... one can overload the normal executer
--~ executer.register('.*')
--~ executer.register('*')
--~ executer.register('dir','ls')
--~ executer.register('dir')
--~ executer.finalize()
--~ executer.execute('dir',"*.tex")
--~ executer.execute("dir *.tex")
--~ executer.execute("ls *.tex")
--~ os.execute('ls')
reminds me to add the exec and spawn variants
when i have time i will add some commandline argument to control it
Hans
-----------------------------------------------------------------
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-21 22:26 ` Arthur Reutenauer
2009-03-21 22:41 ` Wolfgang Schuster
@ 2009-03-22 8:38 ` Wolfgang Schuster
1 sibling, 0 replies; 16+ messages in thread
From: Wolfgang Schuster @ 2009-03-22 8:38 UTC (permalink / raw)
To: Mailing list for ConTeXt users
Am 21.03.2009 um 23:26 schrieb Arthur Reutenauer:
>> Can I divide dimensions to get a number in pdftex?
>
> LaTeX has a package to do exactly that, fp. You could look into its
> code. Or you could use LuaTeX :-)
\startluacode
if tex.dimen["!!dimena"] / tex.dimen["!!dimenb"] > tex.dimen["!!
dimenc"] / tex.dimen["!!dimend"] then
tex.sprint("this")
else
tex.sprint("that")
end
\stopluacode
Wolfgang
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-21 22:08 Dividing dimensions Aditya Mahajan
2009-03-21 22:26 ` Arthur Reutenauer
@ 2009-03-22 0:02 ` Marcin Borkowski
2009-03-22 2:13 ` Aditya Mahajan
2009-03-22 9:41 ` Hans Hagen
2 siblings, 1 reply; 16+ messages in thread
From: Marcin Borkowski @ 2009-03-22 0:02 UTC (permalink / raw)
To: mailing list for ConTeXt users
Dnia Sat, Mar 21, 2009 at 06:08:41PM -0400, Aditya Mahajan napisał(a):
> Hi,
>
> Can I divide dimensions to get a number in pdftex?
>
> I have four dimensions \!!dimena, \!!dimenb, \!!dimenc and \!!dimend, and
> I want
>
> if (dimena/dimenb) > (dimenc/dimend)
> do something
> else
> do otherthing
What about
if (dimena*dimend) > (dimenc*dimenb) ... ?
If dimenb and dimend are positive, this should be equivalent (assuming
you don't run into overflow).
> Any hints on how to do this in ConTeXt.
>
> Thanks,
> Aditya
Regards
--
Marcin Borkowski (http://mbork.pl)
Ja nie chcę czytać tych głupich gazet
I wymyślonych oglądać historii.
(Chili My)
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^ permalink raw reply [flat|nested] 16+ messages in thread* Re: Dividing dimensions
2009-03-22 0:02 ` Marcin Borkowski
@ 2009-03-22 2:13 ` Aditya Mahajan
0 siblings, 0 replies; 16+ messages in thread
From: Aditya Mahajan @ 2009-03-22 2:13 UTC (permalink / raw)
To: mailing list for ConTeXt users
On Sun, 22 Mar 2009, Marcin Borkowski wrote:
> Dnia Sat, Mar 21, 2009 at 06:08:41PM -0400, Aditya Mahajan napisał(a):
>> Hi,
>>
>> Can I divide dimensions to get a number in pdftex?
>>
>> I have four dimensions \!!dimena, \!!dimenb, \!!dimenc and \!!dimend, and
>> I want
>>
>> if (dimena/dimenb) > (dimenc/dimend)
>> do something
>> else
>> do otherthing
>
> What about
>
> if (dimena*dimend) > (dimenc*dimenb) ... ?
>
> If dimenb and dimend are positive, this should be equivalent (assuming
> you don't run into overflow).
I tried that, but that leads to overflow.
Aditya
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^ permalink raw reply [flat|nested] 16+ messages in thread
* Re: Dividing dimensions
2009-03-21 22:08 Dividing dimensions Aditya Mahajan
2009-03-21 22:26 ` Arthur Reutenauer
2009-03-22 0:02 ` Marcin Borkowski
@ 2009-03-22 9:41 ` Hans Hagen
2 siblings, 0 replies; 16+ messages in thread
From: Hans Hagen @ 2009-03-22 9:41 UTC (permalink / raw)
To: mailing list for ConTeXt users
Aditya Mahajan wrote:
> Hi,
>
> Can I divide dimensions to get a number in pdftex?
>
> I have four dimensions \!!dimena, \!!dimenb, \!!dimenc and \!!dimend,
> and I want
depends on what you want to achive as there are many possibilities
\number\dimexp 123pt\relax
\number\dimexp 123pt/65536\relax
there's also
\withoutpt
anyhow, you code ...
\dimen0=10pt
\dimen2=20pt
\dimen4=30pt
\dimen6=40pt
\ifdim \dimexpr\dimen0/\dimen2\relax > \dimexpr\dimen4/\dimen6\relax
do something
\else
do otherthing
\fi
Hans
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| www.pragma-pod.nl
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^ permalink raw reply [flat|nested] 16+ messages in thread
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Thread overview: 16+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2009-03-21 22:08 Dividing dimensions Aditya Mahajan
2009-03-21 22:26 ` Arthur Reutenauer
2009-03-21 22:41 ` Wolfgang Schuster
2009-03-21 22:49 ` Aditya Mahajan
2009-03-21 23:00 ` Wolfgang Schuster
2009-03-23 7:15 ` Alan BRASLAU
2009-03-23 11:35 ` Arthur Reutenauer
2009-03-23 12:12 ` Wolfgang Schuster
2009-03-23 12:22 ` Arthur Reutenauer
2009-03-23 23:27 ` Alan BRASLAU
2009-03-24 6:51 ` Mojca Miklavec
2009-03-24 7:07 ` Hans Hagen
2009-03-22 8:38 ` Wolfgang Schuster
2009-03-22 0:02 ` Marcin Borkowski
2009-03-22 2:13 ` Aditya Mahajan
2009-03-22 9:41 ` Hans Hagen
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