Re: matrix of variables?

[Heber Farnsworth]

Define x as a vector and then reshape it into a matrix within the 
function.

x = reshape(x,5,5);

Heber Farnsworth

On Friday, May 30, 2003, at 05:12 PM, jdonner wrote:

> Hi,
>
>  I'm trying to solve a non-linear equation with 25 vars,
> and it works when I number them from x(1) .. x(25) but,
> they naturally are a 2D array of variables, is there some way I can I 
> use matrix notation for convenience?
> When I try to say this:
> function y = f (x)
> g = 0.9;
> # center parts
> y(2,2) = -1 * x(2,2) + (1/4)*g*(x(1,2) + x(2,1) + x(2,3) + x(3,2));
> y(2,3) = -1 * x(2,3) + (1/4)*g*(x(1,3) + x(2,2) + x(2,4) + x(3,3));
> ... more
>
> I get:
> error: invalid column index = 2
> error: evaluating binary operator `*' near line 4, column 13
> error: evaluating binary operator `+' near line 4, column 22
> error: evaluating assignment expression near line 4, column 8
> error: called from `f'
> error: fsolve: evaluation of user-supplied function failed
>
>
> Is there a way to do this?
> Thanks,
>
> Jeff
>
>
>
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