how to put function as an input to another function?

I save a function call "nonliner" in matlab and I want to call this function as an input like

function [Ar,Br] = algopsols(nonliner,A,B); it give me an error

Is there any solution?

Thank you

Answer 1

[Star Strider]

If you want to use it in the function, you do not have to pass it as an argument. Just include a call to it as part of the function code:

function [Ar,Br] = algopsols(A,B)
returned_values = nonliner( ... argument list ...);
     . . . CODE . . .
end

If you want to pass it as an argument to your function, you have to pass it as a function handle (using an ‘@’ sign):

[Ar,Br] = algopsols(@nonliner,A,B)

[Ahmed]

I used what you suggested,

[Ar,Br] = algopsols(@nonliner,A,B)

But, when I called the function "algopsols", I got an error

[Star Strider]

What was the error?

[Ahmed]

Error using algopsonls Too many input arguments.

Error in run_non_pso (line 15) [Ar,Br] = algopsonls(@nonliner,A,B)

[Star Strider]

Well, if you want to pass the function as an input, you have to allow for it in the argument list:

function [Ar,Br] = algopsols(funname,A,B)
. . . CODE . . .
returned_values = funname( ... argument list ...);
. . . CODE . . .
end

then call it as:

[Ar,Br] = algopsols(@nonliner,A,B);

A simple illustration:

deriv = @(funname,x) (funname(x+1E-8) - funname(x))/1E-8;           % Take A Simple Numerical Derivative

t = linspace(-pi, pi);                                              % Time Vector
dsint_dt = deriv(@sin,t);                                           % Derivative Of ‘sin(t)’

figure(1)
plot(t, sin(t),  t, dsint_dt)
grid