MATLAB: For loop nested plotting

for loopplot

figure
    plot(T,Cost)

Hi,

I have an overall for loop and then there are three nested for loops (one nested loop for each graph). I'm using linspace to run through 10 iterations for the three for loops and when I run my code I get 30 graphs. How do I only get the last three graphs from the 10th iteration?

Thank you.

Best Answer

Use a if-else expression:

if current_iteration == 10
    plot(T,cost)
end

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MATLAB: Nest loop

Why do you think all aren't being calculated? Here is a modified version of your code, not changing the mechanics, which shows what you are getting.

a = 1:3;
b = 1:3;
for i = 1:3;
    for j = 1:3;
        a_pred = a(:,i);
        b_pred = b(:,j);
        disp([a_pred b_pred])    
    end  
end

EDIT

Here is how to store all the results in chi2:

x = 1:3;
y = 1:3;
a = 1:3;
b = 1:3;
chi2 = zeros(9,3);
cnt = 0;
for i = 1:3;
    for j = 1:3;
        cnt = cnt + 1;
        a_pred = a(:,i);
        b_pred = b(:,j);
        y_pred = a_pred + b_pred.* x
        chi2(cnt,:) = (y-y_pred).^2;
    end  
end
chi2

And here is a vectorized version, using NPERMUTEK:

IDX = npermutek(1:3,2);
y_pred = bsxfun(@plus,a(IDX(:,1)), bsxfun(@times,b(IDX(:,2)),x.'));
chi2 = bsxfun(@minus,y,y_pred.').^2

Not that it should be faster here...

MATLAB: ‘break’ in ‘while’ loop

From help break

In nested loops, break exits from the innermost loop only

Best Answer

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MATLAB: Nest loop

MATLAB: ‘break’ in ‘while’ loop

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