GeneralString to number

LaTeX specific issues not fitting into one of the other forums of this category.
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ihiribar
Posts: 4
Joined: Wed Mar 10, 2010 5:30 pm

String to number

Post by ihiribar »

Hi!

From the package feynmf i get stringvalues like 'v1' and 'v2'.... 'vN' which represent points in a feynmangraph. I know how to implement \DrawLeftBentLine... my problem is to convert a string into an integernumber.

i want to draw lines by

Code: Select all

Code, edit and compile here:
\newcommand{\bentline}[2]{
\ifthenelse{\BehindSubString{v}{#1}<\BehindSubString{v}{#2}}{
\DrawLeftBentLine
}{
\DrawRightBentLine
}
}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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i want to call this by:

Code: Select all

Code, edit and compile here:
\bentline{v1}{v2} ... .draws the leftbentline
\bentline{v2}{v1} ... draws the rightbentline
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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But i cannot compare two strings with "<" and ">". i have to convert them to numbers... how do i do this?
Can anybody help?

A minimum example:

Code: Select all

Code, edit and compile here:
\documentclass{article}
\usepackage{substr,ifthen}
\begin{document}
First: \BehindSubString{v}{v1} %First: 1
Second: \BehindSubString{v}{v2} \\ %Second: 2
Test: \ifthenelse{ 1<2}
{Even permutation}
{Odd permutation} %Test: Even permutation
%Next line produces error:
Result: \ifthenelse{ \BehindSubString{v}{v1}<\BehindSubString{v}{v2}}
{Even permutation}
{Odd permutation}
\end{document}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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The error message is

Code: Select all

Code, edit and compile here:
! Illegal parameter number in definition of \@gtempa.
<to be read again>
2
l.10 ...dSubString{v}{v1}<\BehindSubString{v}{v2}}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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P.S.: \BehindSubString is part of the substr package and gets the part behind substring (so the calls above return 1 and 2 respectively but as text not as number)
Last edited by ihiribar on Fri Mar 12, 2010 3:00 pm, edited 1 time in total.

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ihiribar
Posts: 4
Joined: Wed Mar 10, 2010 5:30 pm

String to number

Post by ihiribar »

Ok, maybe this is too complicated to do. but is there any other useful way to have a function do something like

Code: Select all

Code, edit and compile here:
\LeftOrRight{v3}{v5} %writes the word "left"
\LeftOrRight{v1}{v3} %also write the word "left"
\LeftOrRight{v5}{v4} %write the word "right" (because 5>4)
\LeftOrRight{v2}{v1} %write the word "right" (because 2>1)
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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I believe that this should be possible somehow. But i have no idea how to do it. Please help
User avatar
nlct
Posts: 276
Joined: Thu Nov 06, 2008 11:15 am

String to number

Post by nlct »

You could try something like:

Code: Select all

Code, edit and compile here:
\documentclass{article}
\usepackage{ifthen}
\def\extract#1#2\relax{#2}
\newcommand{\LeftOrRight}[2]{%
\ifthenelse{\extract#1\relax<\extract#2\relax}{Left}{Right}%
}
\begin{document}
\LeftOrRight{v3}{v5}
\LeftOrRight{v1}{v3}
\LeftOrRight{v5}{v4}
\LeftOrRight{v2}{v1}
\end{document}
הההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההההה
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Regards
Nicola Talbot
ihiribar
Posts: 4
Joined: Wed Mar 10, 2010 5:30 pm

Re: String to number

Post by ihiribar »

Thank you that was exactly what i needed. :D
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