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

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

Answer 1

[Yongjian Feng]

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.

[Danishtah Quamar]

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]

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