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feval

Evaluate function

Syntax

  • [y1,...,yN] = feval(fun,x1,...,xM)
    example

Description

example

[y1,...,yN] = feval(fun,x1,...,xM) evaluates a function using its name or its handle, and using the input arguments x1,...,xM.

The feval function follows same scoping and precedence rules as calling a function handle directly. For more information, see Create Function Handle.

Examples

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Evaluate Function Using Function Name String

Round the value of pi to the nearest integer using the name of the function.

fun = 'round';
x1 = pi;
y = feval(fun,x1)
y =

     3

Round the value of pi to two digits to the right of the decimal point.

x2 = 2;
y = feval(fun,x1,x2)
y =

    3.1400

Input Arguments

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fun — Function to evaluatefunction name | function handle

Function to evaluate, specified as a function name or a handle to a function. The function accepts M input arguments, and returns N output arguments. To specify fun as a function name, do not include path information.

Invoking feval with a function handle is equivalent to invoking the function handle directly.

Example: fun = 'cos'

Example: fun = @sin

x1,...,xM — Inputs to evaluated functiondepends on function

Inputs to the evaluated function. The types of the inputs depend on the function, fun.

Output Arguments

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y1,...,yN — Outputs from evaluated functiondepends on function

Outputs from evaluated function. The types of the outputs depend on the function, fun.

More About

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Tips

  • If you have a function handle, it is not necessary to use feval because you can invoke the function handle directly. The results of the following statements are equivalent.

    fh = @eig;
    [V,D] = fh(A)
    
    [V,D] = feval(@eig,A)
  • To evaluate a nested or local function using feval, use a function handle instead of the function name. For more information, see Call Local Functions Using Function Handles.

Introduced before R2006a

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