How to call a multi output function without repeating the run

Question

joshua Abam 2019-12-10

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495943-how-to-call-a-multi-output-function-without-repeating-the-run

编辑： Stephen23 2020-1-4

Dear all,

I am having a challenge, which I think, should be possible to overcome, but how to go about it has been challenging for me, I have a function with multiple output in this case 3 output, and I am calling all three output for further use. The issue now is how do I call the three output without repeating the entire calculation in the process. As I have observed that for the 3 times I called it, it runs afresh all 3 times. In the first place calling it once is time consuming how more calling it 3 times, whic makes the process computational expensive to achieve.

Thanks

Kind regards

%The function were all the three output from the multi-output function are to be %inserted for further use.

function [c, ceq] = nonconst(x)

c = total_value(x)-u*v;... ` `%first output from the multi-output %function

u*energy_value(x);... %2nd output from the multi-output %function

v*Delta_value(x); %Third output from the multi-output %function

ceq = [];

end

%The function to call the first output from the digital function

function D_total = total_value(x)

D_total = digital(x) % ca

end

%The function to call the 2nd output from the digital function

function D_value = Delta_value(x)

[~, D_value, ~] = digital(x)

end

%The function to call the third output from the digital function

function D_energy = energy_value(x)

[~, ~, D_energy] = digital(x)

end

%This is a multi-output function comprises of 3 output which are D_total,

% D_value and D_energy

function [D_total, D_value, D_energy] = digital(x)

;;;;;;;;;;;; %The conetent of the function has been cleared

;;;;;;;;;;;

;;;;;;;;;;

end

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Steven Lord 2019-12-13

This looks to be very similar or the same as the question you were asking here where you received some explanation and advice. Why did you start another question? Clarifying questions and suggestions made in one of the discussions won't be visible to participants in the other.

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Answer 1

Fabio Freschi 2019-12-10

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/495943-how-to-call-a-multi-output-function-without-repeating-the-run#answer_405798

在 MATLAB Online 中打开

function [c, ceq] = nonconst(x)
[total_value, Delta_value, energy_value] = digital(x);
 c = total_value-u*v;... `       `%first nonlinear constrain
    u*energy_value;...           %2nd Nonlinear constrain
    v*Delta_value;
ceq = [];
end

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joshua Abam 2020-1-4

Hi Fabio

I taught about that but was a bit uncertain.

Thanks for the suggestion .

kind regards

Joshua

Stephen23 2020-1-4

编辑：Stephen23 2020-1-4

For such trivial code as this you should not get into the bad habit of using global variables.

Passing data as input/output arguments is neater and much more efficient. Passing data as input/output arguments is what the MATLAB documentation (and all experienced MATLAB users) recommend:

https://www.mathworks.com/help/matlab/matlab_prog/share-data-between-workspaces.html

Another very efficient option is to use nested functions:

https://www.mathworks.com/help/matlab/matlab_prog/nested-functions.html

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