How to call a function inside other function in a equation?

Question

Danishtah Quamar 2022-1-25

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1635810-how-to-call-a-function-inside-other-function-in-a-equation

评论： Yongjian Feng 2022-1-25

I have one function function B=magnetic flux(x)

B=x(1)+x(2)+x(3);

end

Now I have to call B in other function function y=yield(x)

where y= x(1)*e^-B where B is magnetic flux

How to do it without writing the equation of B in second function

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Answer 1

Yongjian Feng 2022-1-25

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1635810-how-to-call-a-function-inside-other-function-in-a-equation#answer_881450

编辑：Yongjian Feng 2022-1-25

在 MATLAB Online 中打开

It depends on whether you need to use B in anywhere else. If B is only used in your function yield, you can put it in the same m file, otherwise create a separate file for B.

Case 1. Same m file. Call it yield.m

function y=yield(x)
    B = magnetic_flux(x);
    y= x(1)*e^(-B)
end
% internal function 
function B=magnetic_flux(x)
    B=x(1)+x(2)+x(3);
end

2. Case 2. Two m files. Put yield function in yield.m, and magnetic_flux function in magnetic_flux.m.

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Danishtah Quamar 2022-1-25

When I have 2 .m files. One for yield and one for magnetic flux. Then how to call magnetic_ flux.m files in yield.m files. Then what is the code for that.

Yongjian Feng 2022-1-25

在 MATLAB Online 中打开

The simpliest way is to put both .m files in the same folder, then when access one file, the other file is also available. So two m files:

yield.m

% you have one function in this file. Matlab will force you to name the
% file the same as the function name
function y=yield(x)
    % magnetic_flux.m is in the same folder, so you can call it
    B = magnetic_flux(x);
    y= x(1)*e^(-B)
end

2. magnetic_flux.m (Please note the _ in the file name!)

% same here. One function in a m file. Matlab will force you to use the
% function name as the file name
function B=magnetic_flux(x)
    B=x(1)+x(2)+x(3);
end