func2str - Construct character vector from function handle - MATLAB (original) (raw)

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Construct character vector from function handle

Syntax

Description

c = func2str([fh](#f71-893093-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.

example

Examples

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Convert Function Handle to Character Vector

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)

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

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.

Extended Capabilities

C/C++ Code Generation

Generate C and C++ code using MATLAB® Coder™.

Usage notes and limitations:

If the input argument is associated with an anonymous function, then the generated code returns the character vector'@(...)...'.

Thread-Based Environment

Run code in the background using MATLAB® backgroundPool or accelerate code with Parallel Computing Toolbox™ ThreadPool.

Version History

Introduced before R2006a