func2str

Construct character vector from function handle

Syntax

c = func2str(fh)

Description

c = func2str(fh) constructs a character vector, c, that contains the name of the function associated with the function handle, fh. If fh is associated with an anonymous function, func2str returns a character vector that represents the anonymous function.

Examples

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Convert Function Handle to Character Vector

Open Live Script

Create function handles for both the cos function and for an anonymous function, and then convert them to character vectors.

fh = @cos;
c = func2str(fh)

c = 
'cos'

fh = @(x,y)sqrt(x.^2+y.^2);
c = func2str(fh);

disp(['Anonymous function: ' c])

Anonymous function: @(x,y)sqrt(x.^2+y.^2)

Programmatically Display Function Handle Name as Character Vector

Open Script

Create a function that evaluates a function handle for a single input.

Create the following function in a file, evaluateHandle.m, in your working folder.

function evaluateHandle(fh,x)

y = fh(x);
str = func2str(fh);

disp('For input value: ')
disp(x)
disp(['The function ' str ' evaluates to:'])
disp(y)

end

Use a function handle to evaluate the sin function at pi/2.

fh = @sin;
x = pi/2;
evaluateHandle(fh,x)

For input value: 
    1.5708

The function sin evaluates to:
     1

Use a function handle to evaluate $x^2 + 7$ for the specified matrix, A.

fh = @(x) x.^2+7;
A = [1 2;0 1];
evaluateHandle(fh,A)

For input value: 
     1     2
     0     1

The function @(x)x.^2+7 evaluates to:
     8    11
     7     8

Input Arguments

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`fh` — Handle to convert to character vector
function handle

Handle to convert to a character vector, specified as a function handle.

Tips

You lose variables stored in the function handle when you convert it to a character vector using func2str, and then back to a handle using str2func.