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

2 vues (au cours des 30 derniers jours)
Danishtah Quamar le 25 Jan 2022
Commenté : Yongjian Feng le 25 Jan 2022
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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### Réponses (1)

Yongjian Feng le 25 Jan 2022
Modifié(e) : Yongjian Feng le 25 Jan 2022
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.
1. 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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Yongjian Feng le 25 Jan 2022
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:
1. 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

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