MATLAB: Calling Upon previous anonymous function results for use in a second anonymous function

Question

I am plotting an anonymous function which produces values that I would like to use in plotting a second anonymous function. Is there anyway to store values of of the function obtained on the interval of the anonymous variable?

Answer 1

You can use one anonymous function (or any other function) is a second function. You simply have to call it as a function in the second function.

Try this:

Psat1 = ...;                                % Provide Value
Psat2 = ...;                                % Provide Value
P_x = @(x1) Psat2 + (Psat1 - Psat2)*x1;     % First Anonymous Function

y = @(x1) x1.*Psat1./P_x(x1);               % Second Anonymous Function

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EDIT —

This works for me:

Psat1 = rand;
Psat2 = rand;
P_x = @(x1) Psat2 + (Psat1 - Psat2).*x1;                            % First Anonymous Function
y1 = @(x1) x1.*Psat1./P_x(x1);                                      % Second Anonymous Function
P_y = @(x1) Psat2 + (Psat1 - Psat2).*((y1(x1).*P_x(x1))./Psat1);    % Third Anonymous Function
fplot(P_y,[0,1])

It is necessary to use Vectorization (link) in your functions when you combine them, so you do element-wise operations. (This will avoid warnings such as: ‘Function behaves unexpectedly on array inputs.’.)