how to update the step size in my code ?

Question

kitty varghese 2017-9-6

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/355405-how-to-update-the-step-size-in-my-code

评论： KL 2017-9-8

This is a dummy program. I want to update the values of stepsize1 and stepsize2 such that my error<0.5. I have coded something but I'm unable to update the new value.

if true
A=[25 30 47 58;11 25 87 98;77 44 85 23;97 48 25 14];
B=[1 5;5 1;7 7;9 8];
C=[74 2 11 7;5 6 9 9];
stepsize1=1;
stepsize2=1;
B1=stepsize1*B;
C1=stepsize2*C;
W=B1*C1;
error=pdist2(A,W,'euclidean');
if error<0.5
  break
else stepsize1=stepsize1+0.1;
  stepsze2=stepsize2+0.1;
end
end

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Answer 1

KL 2017-9-6

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/355405-how-to-update-the-step-size-in-my-code#answer_280438

在 MATLAB Online 中打开

Something like this??

A=[25 30 47 58;11 25 87 98;77 44 85 23;97 48 25 14];
B=[1 5;5 1;7 7;9 8];
C=[74 2 11 7;5 6 9 9];
stepsize1=0.9;
stepsize2=0.9;
error_val = 1; %dummy
while error_val>0.5
    stepsize1=stepsize1+0.1;
    stepsze2=stepsize2+0.1;
    B1=stepsize1*B;
    C1=stepsize2*C;
    W=B1*C1;
    error_val=pdist2(A,W,'euclidean')
end

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kitty varghese 2017-9-8

why did you use error_val=1;

KL 2017-9-8

while loop checks condition (in this case, error_val>0.5) at the start, so we just need something more than 0.5 so the loop is executed at least once to calculate the actual value of the error_val. Then the loop is repeated until this condition becomes false.

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