How to calculate standard deviation in double for loop?

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Wiqas Ahmad
Wiqas Ahmad 2021-4-22
评论： Wiqas Ahmad 2021-4-22
for j = 1:length(EC)
for k = 1:length(Reff)
eval(['depri',num2str(j),num2str(k),'=','(depi',num2str(1),num2str(j),num2str(k),')./(depi',num2str(2),num2str(j),num2str(k),');']);
end
end
deprir1 = [depri11(10) depri12(10) depri13(10) depri14(10) depri15(10)];
deprir2 = [depri21(10) depri22(10) depri23(10) depri24(10) depri15(10)];
deprir3 = [depri31(10) depri32(10) depri33(10) depri34(10) depri15(10)];
deprir4 = [depri41(10) depri42(10) depri43(10) depri44(10) depri15(10)];
I want to write a function to calculate the standard deviation in the function 'depri' written in the eval expression for both of the loop indices, j and k. So after that, I would be able to calculate the standard deviaiton in each value of depri (deprir1,deprir2,.......) at each point (depri11(10), depri12(10),.....).

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回答（1 个）

James Tursa
James Tursa 2021-4-22
The short answer is don't do that. This style of programming has many problems. See this link for alternatives:
https://www.mathworks.com/matlabcentral/answers/304528-tutorial-why-variables-should-not-be-named-dynamically-eval?s_tid=srchtitle
  1 个评论
Wiqas Ahmad
Wiqas Ahmad 2021-4-22
Thank you for your suggestions. I will adopt the alternatives to eval function but my program is too lengthy and will consume more time because I posted here just a portion of my program. On the other hand, this is a recommended program by my supervisor to modify to obtain my results, otherwise I'm not enough expert in programming. What I needed now is to learn how can we calculate the standard deviation in this case using double forloop? After all, I will improve my program to be more efficient.

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