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

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?

[Greg]

Can you post the relevant code to give us something to work with?

[mht6]

P_x = @(x1) Psat2 + (Psat1 - Psat2)*x1;
fplot(P_x,[0,1])

Where Psat1 and Psat2 are constants. Ideally, I would then find a second set of y values (to plot another curve) using the P and x values that exist in the previous function. y = x1*Psat1/P is the equation. I know how to do this in a for loop but am wondering if there is any way to do this with an anonymous function. Thanks.

Answer 1

[Star Strider]

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

--------------------

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.’.)

Answer 2

[Steven Lord]

You want y to be a function of x1 that uses the existing P_x function?

% Sample values for Psat1 and Psat2
Psat1 = 1;
Psat2 = 2;
P_x = @(x1) Psat2 + (Psat1 - Psat2)*x1;
fplot(P_x,[0,1])
y = @(x1) x1*Psat1/P_x(x1)