Problem with string.format (Lua)

Problem with string.format (Lua)

[Fabrice Couvreur]

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Hello,
I start with Lua and I try to display my result with 4 decimal places
without success.
Thank you
Fabrice

\startluacode
function Binomial(n,k,p)
    if k > n then return nil end
    if k > n/2 then k = n - k end

    numer, denom = 1, 1
    for i = 1, k do
        numer = numer * ( n - i + 1 )
        denom = denom * i
    end
    return (numer/denom) * p^k * (1-p)^(n-k)
end

\stopluacode

\starttext
\ctxlua{print(string.format("%g",Binomial(100,60,0.25)))}
\stoptext

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Re: Problem with string.format (Lua)

[Joseph Canedo]

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Hi Fabrice,

string.format behaves more or less as C printf. You probably need to specify %.4g in 1st argument.
Hope this helps

Best
Joseph

De : Fabrice Couvreur
Envoyé le :dimanche 14 janvier 2018 13:05
À : mailing list for ConTeXt users
Objet :[NTG-context] Problem with string.format (Lua)

Hello,
I start with Lua and I try to display my result with 4 decimal places without success.
Thank you
Fabrice

\startluacode
function Binomial(n,k,p)
    if k > n then return nil end
    if k > n/2 then k = n - k end 
 
    numer, denom = 1, 1
    for i = 1, k do
        numer = numer * ( n - i + 1 )
        denom = denom * i
    end
    return (numer/denom) * p^k * (1-p)^(n-k)
end

\stopluacode

\starttext
\ctxlua{print(string.format("%g",Binomial(100,60,0.25)))}
\stoptext


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___________________________________________________________________________________

Re: Problem with string.format (Lua)

[Hans Hagen]

On 1/14/2018 1:13 PM, Joseph Canedo wrote:
> Hi Fabrice,
> 
> string.format behaves more or less as C printf. You probably need to 
> specify %.4g in 1st argument.
> 
> Hope this helps
> 
> Best
> 
> Joseph
> 
> *De : *Fabrice Couvreur <mailto:fabrice1.couvreur@gmail.com>
> *Envoyé le :*dimanche 14 janvier 2018 13:05
> *À : *mailing list for ConTeXt users <mailto:ntg-context@ntg.nl>
> *Objet :*[NTG-context] Problem with string.format (Lua)
> 
> Hello,
> I start with Lua and I try to display my result with 4 decimal places 
> without success.
> Thank you
> Fabrice
> 
> \startluacode
> function Binomial(n,k,p)
>      if k > n then return nil end
>      if k > n/2 then k = n - k end
> 
>      numer, denom = 1, 1
>      for i = 1, k do
>          numer = numer * ( n - i + 1 )
>          denom = denom * i
>      end
>      return (numer/denom) * p^k * (1-p)^(n-k)
> end
> 
> \stopluacode
> 
> \starttext
> \ctxlua{print(string.format("%g",Binomial(100,60,0.25)))}
> \stoptext

the % should be \letterpercent

btw, use locals for numer and denom

you can also do this:

\startluacode
     function document.Binomial(n,k,p)
         if k > n then
             return nil
         end
         if k > n/2 then
             k = n - k
         end
         local numer, denom = 1, 1
         for i=1,k do
             numer = numer * ( n - i + 1 )
             denom = denom * i
         end
         context("%0.5g",(numer/denom) * p^k * (1-p)^(n-k))
     end
\stopluacode

\starttext
     \ctxlua{document.Binomial(100,60,0.25)}
\stoptext

in general

context("format",....)

is a bit more powerful than using format




-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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
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___________________________________________________________________________________

Re: Problem with string.format (Lua)

[Fabrice Couvreur]

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Hi Hans,
Your code runs perfectly, thanks. However, if I replace % with
\letterpercent, my code does not run

\ctxlua{print(string.format("\letterpercent g",Binomial(100,60,0.25)))}

Thank you
Fabrice

2018-01-14 13:58 GMT+01:00 Hans Hagen <pragma@wxs.nl>:

> On 1/14/2018 1:13 PM, Joseph Canedo wrote:
>
>> Hi Fabrice,
>>
>> string.format behaves more or less as C printf. You probably need to
>> specify %.4g in 1st argument.
>>
>> Hope this helps
>>
>> Best
>>
>> Joseph
>>
>> *De : *Fabrice Couvreur <mailto:fabrice1.couvreur@gmail.com>
>> *Envoyé le :*dimanche 14 janvier 2018 13:05
>> *À : *mailing list for ConTeXt users <mailto:ntg-context@ntg.nl>
>> *Objet :*[NTG-context] Problem with string.format (Lua)
>>
>> Hello,
>> I start with Lua and I try to display my result with 4 decimal places
>> without success.
>> Thank you
>> Fabrice
>>
>> \startluacode
>> function Binomial(n,k,p)
>>      if k > n then return nil end
>>      if k > n/2 then k = n - k end
>>
>>      numer, denom = 1, 1
>>      for i = 1, k do
>>          numer = numer * ( n - i + 1 )
>>          denom = denom * i
>>      end
>>      return (numer/denom) * p^k * (1-p)^(n-k)
>> end
>>
>> \stopluacode
>>
>> \starttext
>> \ctxlua{print(string.format("%g",Binomial(100,60,0.25)))}
>> \stoptext
>>
>
> the % should be \letterpercent
>
> btw, use locals for numer and denom
>
> you can also do this:
>
> \startluacode
>     function document.Binomial(n,k,p)
>         if k > n then
>             return nil
>         end
>         if k > n/2 then
>             k = n - k
>         end
>         local numer, denom = 1, 1
>         for i=1,k do
>             numer = numer * ( n - i + 1 )
>             denom = denom * i
>         end
>         context("%0.5g",(numer/denom) * p^k * (1-p)^(n-k))
>     end
> \stopluacode
>
> \starttext
>     \ctxlua{document.Binomial(100,60,0.25)}
> \stoptext
>
> in general
>
> context("format",....)
>
> is a bit more powerful than using format
>
>
>
>
> --
>
> -----------------------------------------------------------------
>                                           Hans Hagen | PRAGMA ADE
>               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
> -----------------------------------------------------------------
> ____________________________________________________________
> _______________________
> 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/list
> info/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
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wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: Problem with string.format (Lua)

[Hans Hagen]

On 1/14/2018 9:50 PM, Fabrice Couvreur wrote:
> Hi Hans,
> Your code runs perfectly, thanks. However, if I replace % with  
> \letterpercent, my code does not run
> 
> \ctxlua{print(string.format("\letterpercent g",Binomial(100,60,0.25)))}

because print prints to the console

> Thank you
> Fabrice
> 
> 2018-01-14 13:58 GMT+01:00 Hans Hagen <pragma@wxs.nl 
> <mailto:pragma@wxs.nl>>:
> 
>     On 1/14/2018 1:13 PM, Joseph Canedo wrote:
> 
>         Hi Fabrice,
> 
>         string.format behaves more or less as C printf. You probably
>         need to specify %.4g in 1st argument.
> 
>         Hope this helps
> 
>         Best
> 
>         Joseph
> 
>         *De : *Fabrice Couvreur <mailto:fabrice1.couvreur@gmail.com
>         <mailto:fabrice1.couvreur@gmail.com>>
>         *Envoyé le :*dimanche 14 janvier 2018 13:05
>         *À : *mailing list for ConTeXt users <mailto:ntg-context@ntg.nl
>         <mailto:ntg-context@ntg.nl>>
>         *Objet :*[NTG-context] Problem with string.format (Lua)
> 
>         Hello,
>         I start with Lua and I try to display my result with 4 decimal
>         places without success.
>         Thank you
>         Fabrice
> 
>         \startluacode
>         function Binomial(n,k,p)
>               if k > n then return nil end
>               if k > n/2 then k = n - k end
> 
>               numer, denom = 1, 1
>               for i = 1, k do
>                   numer = numer * ( n - i + 1 )
>                   denom = denom * i
>               end
>               return (numer/denom) * p^k * (1-p)^(n-k)
>         end
> 
>         \stopluacode
> 
>         \starttext
>         \ctxlua{print(string.format("%g",Binomial(100,60,0.25)))}
>         \stoptext
> 
> 
>     the % should be \letterpercent
> 
>     btw, use locals for numer and denom
> 
>     you can also do this:
> 
>     \startluacode
>          function document.Binomial(n,k,p)
>              if k > n then
>                  return nil
>              end
>              if k > n/2 then
>                  k = n - k
>              end
>              local numer, denom = 1, 1
>              for i=1,k do
>                  numer = numer * ( n - i + 1 )
>                  denom = denom * i
>              end
>              context("%0.5g",(numer/denom) * p^k * (1-p)^(n-k))
>          end
>     \stopluacode
> 
>     \starttext
>          \ctxlua{document.Binomial(100,60,0.25)}
>     \stoptext
> 
>     in general
> 
>     context("format",....)
> 
>     is a bit more powerful than using format
> 
> 
> 
> 
>     -- 
> 
>     -----------------------------------------------------------------
>                                                Hans Hagen | PRAGMA ADE
>                    Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
>             tel: 038 477 53 69 | www.pragma-ade.nl
>     <http://www.pragma-ade.nl> | www.pragma-pod.nl
>     <http://www.pragma-pod.nl>
>     -----------------------------------------------------------------
>     ___________________________________________________________________________________
>     If your question is of interest to others as well, please add an
>     entry to the Wiki!
> 
>     maillist : ntg-context@ntg.nl <mailto:ntg-context@ntg.nl> /
>     http://www.ntg.nl/mailman/listinfo/ntg-context
>     <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/
>     <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
> ___________________________________________________________________________________
> 


-- 

-----------------------------------------------------------------
                                           Hans Hagen | PRAGMA ADE
               Ridderstraat 27 | 8061 GH Hasselt | The Netherlands
        tel: 038 477 53 69 | www.pragma-ade.nl | www.pragma-pod.nl
-----------------------------------------------------------------
___________________________________________________________________________________
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
___________________________________________________________________________________