Output argument "rmax" (and maybe others) not assigned during call to "bestdesign".

Output argument "rmax" (and maybe others) not assigned during call to "bestdesign".

M-File

function [max,rmax,hmax]=bestdesign(L,W,H,start,stop)

r=start;

max=0;

if r<=stop

    num = InsectContainers(L,W,H,r);

    if num > max

        max=num;

        rmax=r;

    else

        r=r+0.0001;

    end

else hmax=1000/(pi*rmax^2);

end

Can someone tell me why this isn't working please?

Here is the code for InsectContainers.m if it helps

function numContainer = InsectContainers(L,W,H,r)

V = 1000;

h = V/(pi*(r^2));

Stacks = fix(H/h);

Rows = fix(L/(2*r));

Num = fix(W/(2*r));

numContainer = Stacks*Rows*Num;

end

Answer 1

[Star Strider]

The easiest way to correct that is to assign all your return variables as something, then replace them as necessary in the code:

function [max,rmax,hmax]=bestdesign(L,W,H,start,stop)
[max,rmax,hmax] = deal(NaN, NaN, NaN);                  % <— ADD THIS LINE
r=start;
max=0;
if r<=stop
    num = InsectContainers(L,W,H,r);
    if num > max
        max=num;
        rmax=r;
    else
        r=r+0.0001;
    end
else hmax=1000/(pi*rmax^2);
end

Answer 2

[Marc Jakobi]

You should initialize rmax and hmax at the beginning of your function. If r is greater than stop, hmax is never defined and if num is smaller than or equal to max, rmax is never defined.