how to run function for several times with different variables

Question

Asliddin Komilov 2019-3-5

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https://ww2.mathworks.cn/matlabcentral/answers/448396-how-to-run-function-for-several-times-with-different-variables

评论： Stephen23 2019-3-12

I have something like this:

a=5
b=8
c=9
d=11
%a,b,c and d are function inputs
n=a*0.1:a*0.1:a
for i=1:length(n)
"function"
end

but I need to run function replacing 'a' in 'n' with 'b','c' and 'd' at once and save the data so I can compare it. it is a sensitivity analysis for this function outputs.

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dpb 2019-3-5

To do every point for all four variables would be quad-nested for loops and you'd end up with 4^10= 1048576 outputs. Depending on how expensive function() is in compute time, this might take a while...

Typically one uses response surface methods or similar to do such studies that replace the detail function with a (typically) quadratic surface over the design space. (Myers, RH, Response Surface Methodology, Allyn and Bacon, 1971 was my "go to" and still a favorite).

Asliddin Komilov 2019-3-12

that is too difficult for me, I did it for each variable separately (see below). thank you

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Answer 1

Dennis 2019-3-5

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在 MATLAB Online 中打开

In your example you do not need more than one variable:

a=[5 8 9 11];
for i=1:numel(a)
    n=a(i)*0.1:a(i)*0.1:a(i);
    for k=1:numel(n)
    %function
    end
end

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dpb 2019-3-5

"but I need to run function replacing 'a' in 'n' with 'b','c' and 'd'..."

Asliddin Komilov 2019-3-12

thanks, but it gave error inside th function, so I decided to skip it.

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Answer 2

Asliddin Komilov 2019-3-12

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/448396-how-to-run-function-for-several-times-with-different-variables#answer_364936

编辑：Stephen23 2019-3-12

在 MATLAB Online 中打开

I just saved the loop for each variable.

a=5
b=8
c=9
d=11
%a,b,c and d are function inputs
n=a*0.1:a*0.1:a
for i=1:length(n)
"function"
end
save file_a
a=a(end);
clear "function outputs"
%--------------------------
n=b*0.1:b*0.1:b
for i=1:length(n)
"function"
end
save file_b
b=b(end);
clear "function outputs"
%---------------------------
..........