Dear all, when I tried to plot the T vs. s diagram, the error "Attempted to access (5,0); index must be a positive integer or logical." shows up. When I switch T=0:1:30 to T=1:1:30, the diagram is very wrong. The good diagram only comes when I set t = 1:length(T). Could someone tells me why? Thanks a lot.

clear all;

Sigma = 5:5:30;

T = 0:1:30;

for sigma = Sigma;

` for t = T;`

s(sigma,t) = (sigma-3+0.072*t*(1+0.072*t))/0.77;

` end;`

end;

plot(s,T);

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