Ouputting for loop into a matrix

Question

Tom Starley 2011-3-8

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2741-ouputting-for-loop-into-a-matrix

Hi guys

I have a function called 'simulator' that has two inputs, Cl and Cd. The function outputs a Time around a circuit for these inputs.

I want to be able to execute a loop that runs a combination of Cls and Cds between 0 and 3, and to output all the resulting times into a matrix, and THEN to be able to find the smallest time and Matlab to tell me what time this is, and what Cl and Cd combination this was.

Has anyone any idea how to go about this code? So far I have...

for i=[0.1:0.1:3]; j=[0.1:0.1:3]; a=[1:1:30]; y(a)= simulator([(i) (j)]) end

But I'll be honest, it doesn't really work at all...

Many thanks in advance guys!

Tom

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Answer 1

Vieniava 2011-3-8

1
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2741-ouputting-for-loop-into-a-matrix#answer_4256

在 MATLAB Online 中打开

Try this:

Ci=0.1:0.1:30;
Cd=0.1:0.1:30;
y=zeros(numel(Ci), numel(Cd));
for i=1:numel(Ci)
  for j=1:numel(Cd)
     y(i,j)=simulator([ Ci(i) Cd(j) ]);
  end
end
imagesc(y)
[v i]=min(y);
[II JJ]=ind2sub(size(y), i);
sprintf('The smallest time %f is for Ci=%f and Cd=%f', v,Ci(II),Cd(JJ))

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Tom Starley 2011-3-8

Vieniava

This code is brilliant, I have changed the Ci and Cd to 0.1:0.1:3 as I am sure the values will lie inbetween 0 and 3. This also much reduces the computation time!

The only problem I still seem to be having is at the end, it displays the following:

The smallest time 95.005982 is for Ci=118.885774 and Cd=140.111798The smallest time 159.250258 is for Ci=176.603264 and Cd=192.338545The smallest time 207.112835 is for Ci=220.914477 and Cd=234.133907The smallest time 246.479911 is for Ci=258.407939 and Cd=269.568466The smallest time 280.314259 is for Ci=290.946989 and Cd=300.968033The smallest time 310.678542 is for Ci=320.079490 and Cd=329.371710The smallest time 338.355919 is for Ci=347.032742 and Cd=355.602727The smallest time 363.866357 is for Ci=372.024060 and Cd=379.776219The smallest time 387.623178 is for Ci=395.379177 and Cd=402.887473The smallest time 409.935795 is for Ci=417.364765 and Cd=424.389820The smallest time 0.700000 is for Ci=0.700000 and Cd=0.800000The smallest time 0.900000 is for Ci=1.000000 and Cd=1.000000The smallest time 1.100000 is for Ci=1.000000 and Cd=0.700000The smallest time 0.400000 is for Ci=0.200000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=1.900000 and Cd=2.000000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000The smallest time 0.100000 is for Ci=0.100000 and Cd=0.100000

Any ideas???

Tom Starley 2011-3-8

The problems being that it's printing loads of different times, and it's taking values for Cd and Ci in excess of 400 when I want all possible of combinations of Ci and Cd when Ci=[0.1:0.1:3] and Cd=[0.1:0.1:3]

Many thanks!

Jan 2011-3-8

Simpler finding of minimal value using linear indexing:

[v, ind] = min(y(:));

sprintf('The smallest time %f is for Ci=%f and Cd=%f', v, Ci(ind), Cd(ind));

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Answer 2

Paulo Silva 2011-3-8

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/2741-ouputting-for-loop-into-a-matrix#answer_4254

在 MATLAB Online 中打开

y=zeros(1,30);
i=[0.1:0.1:3]; 
j=[0.1:0.1:3];
for pos=1:numel(i)
y(pos)=simulator([i(pos) j(pos)]) 
end
fprintf('The minimum time was %d for i=%d and j=%d',min(y),i(y==min(y)),j(y==min(y))