Graphics, Figures & Tables ⇒ TikZ: I have to define a variable twice?

[topsquark]

I'm making a program to fill out a Clebsch-Gordon spin table. There are a few tweaks that still need to be done, but I'm almost there. One of them is this: I have the variables \j1 and \j2. I have to define them in the main block, and then I have to define them again in the function block for coeff. For some reason, if I don't redefine them, they turn into 01 and 02, respectively, instead of their previously defined values.

Here's the code. I have indicated the \j1 and \j2 lines with long arrows on the right.

Code: Select all

Code, edit and compile here:

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\documentclass[tikz]{standalone}
\usepackage{fp}
\usetikzlibrary{math, fixedpointarithmetic}
\begin{document}
\begin{tikzpicture}[fixed point arithmetic]
% Variables
%    j1, m1, j2, m2: Input spin vectors
%    jtot, mtot: Input total spin vector
%    jitot, mitot, mi1, mi2: Temporary spin vector values for the coeff function
%    blocks: Number of coefficient boxes
%    dw, dh: Number of cells per per box
%    aoldx, aoldy: Coordinates of the top right of the last coeefficient grid
%    anewx, anewy: Coordinates of the top right of the new coefficient grid
%    num: Number to be converted to fraction
%    r: Returned fraction
%    w, h: Width and height of one cell
%    n, d: Throw-away integers
%    c, i, j, k, hm1, p, q, s, wjtot: Throw-away variables
% Program Block
     \tikzmath {
% Convert A Decimal To A Fraction
         function f(\num) {
               integer \n, \d;
               \stop=0;
               for \k in {1,...,200} {
                    \a=\k*\num;
                    if \stop==0 then {
                         if int(abs(\a))==abs(\a) then {
                              if \k==1 then {\n=\num; let \r="\n"; \stop=1; }
                                   else {\n=\a; \d=\k; let \r="\n/\d"; \stop=1; };
                         };
                    };
              };
              return \r;
          };
          function coeff(\jitot,\mitot,\mi1,\mi2) {
               \j1=1/2; \j2=1/2; %<--------------------------------------------------------------------
               \s=0;
               for \ki in {0,...,0} {
                    \s=\s+1/((\ki)!*(\j1+\j2-\jitot-\ki)!*(\j1-\mi1-\ki)!*(\j2+\mi2-\ki)!*(\jitot-\j2+\mi1+\ki)!*(\jitot-\j1-\mi2+\ki)!);
               };
 
 
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Run LaTeX here

Thanks!

-Dan

[topsquark]

Okay, I figured it out. When I was testing things out I had shortened my loops to go from 0 to 0. What was happening was, inside the loop \j in {0,...,0}, I was getting \j1 = 01 because \j =0. I changed my for loop variable to \t and now I don't have to redefine anything.

I realize that TikZ isn't a strictly Mathematically driven programming language but some of this is just killing me!

-Dan