format float numbers in luatex

format float numbers in luatex

[batela]

Dear Sirs,

I'm looking a way to format float numbers. For example 
\ctxlua{text.print(sqrt(2))} give me 1.41421356237309504880 but i want 
1.414.

Is there a way to format real numbers.

Note: I had tried  \ctxlua{a = sqrt(a) ; aformat = 
string.format("0.3%f", a) ; text.print(aformat)}

  but that don't work because the  % character

thanks a lot

Have a nice day

jorge

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Re: format float numbers in luatex

[Wolfgang Schuster]

Am 24.10.2009 um 18:59 schrieb batela:

> Dear Sirs,
>
> I'm looking a way to format float numbers. For example \ctxlua 
> {text.print(sqrt(2))} give me 1.41421356237309504880 but i want 1.414.
>
> Is there a way to format real numbers.
>
> Note: I had tried  \ctxlua{a = sqrt(a) ; aformat = string.format 
> ("0.3%f", a) ; text.print(aformat)}
>
> but that don't work because the  % character

\ctxlua{text.sprint(string.format("0.3\%f",sqrt(2)))}

or

\ctxlua{text.sprint(string.format("0.3\letterpercent f",sqrt(2)))}

Wolfgang

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maillist : ntg-context@ntg.nl / http://www.ntg.nl/mailman/listinfo/ntg-context
webpage  : http://www.pragma-ade.nl / http://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________

Re: format float numbers in luatex

[Otared Kavian]

Hi Jorge,

Regarding your first question try this:

\starttext

The square root of 2 is \ctxlua{tex.print(math.sqrt(2))}\dots, but  
usually the default value
\ctxlua{tex.print(math.floor(1000*math.sqrt(2))/1000)}
is considered to be a good approximation.

\stoptext

(There is also math.ceil)

Best regards: OK
On 24 oct. 2009, at 18:59, batela wrote:

>
> Dear Sirs,
>
> I'm looking a way to format float numbers. For example \ctxlua 
> {text.print(sqrt(2))} give me 1.41421356237309504880 but i want 1.414.
>
> Is there a way to format real numbers.
>
> Note: I had tried  \ctxlua{a = sqrt(a) ; aformat = string.format 
> ("0.3%f", a) ; text.print(aformat)}
>
> but that don't work because the  % character
>
> thanks a lot
>
> Have a nice day
>
> jorge
>
> ___________________________________________________________________________________
> 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://tex.aanhet.net
> archive  : http://foundry.supelec.fr/projects/contextrev/
> 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://tex.aanhet.net
archive  : http://foundry.supelec.fr/projects/contextrev/
wiki     : http://contextgarden.net
___________________________________________________________________________________