Re: Recursion / global variables trouble

[Pieter Thysebaert]

On Friday 25 January 2002 09:39, Pieter Thysebaert wrote:
> function r=forloop(z,depth)
>     global iterationvars; %vector that holds the variable values
>     global N;
>     global Q;
>
>     if (depth==N)
>         r = calc_term_in_function_of_iteration_vars(z);
>     else
>         for iterationvars(depth)=0:Q-sum(iterationvars(1:depth-1))
>            %for x1, where depth = 1,  sum(iterationvars(1:0)) will return
> 0=OK %DEBUG printf
>            printf("Value of x%d is %d\n\r",depth,iterationvars(depth));
>            r = r+forloop(z,depth+1);
>         endfor
>     endif
> endfunction

 ....

> So somehow  iterationvars(depth) is not adjusted properly (in the
> for...line) Can anybody help me with this parameter passing /global
> variable issue ?

I helped myself; instead of adjusting the global var iterationvars in the
for... line, I inserted an auxiliary variable:

for x= 0:Q-sum(iterationvars(1:depth-1))
    iterationvars(depth) = x;
    %continue as before

and it works now!

(But I still don't know why the original form didn't)

Pieter

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