Pass Function to Another Function
You can use function handles as input arguments to other functions, which are called function
functions . These functions evaluate mathematical expressions over a range of values. Typical
function functions include integral, quad2d, fzero, and fminbnd.
For example, to find the integral of the natural log from 0 through 5, pass a handle to the log
function to integral.
a = 0;
b = 5;
q1 = integral(@log,a,b)
q1 = 3.0472
Similarly, to find the integral of the sin function and the exp function, pass handles to those
functions to integral.
q2 = integral(@sin,a,b)
q2 = 0.7163
q3 = integral(@exp,a,b)
q3 = 147.4132
Also, you can pass a handle to an anonymous function to function functions. An anonymous function is
a one-line expression-based MATLAB® function that does not require a program file. For example,
evaluate the integral of x/(e x − 1) on the range [0,Inf]:
fun = @(x)x./(exp(x)-1);
q4 = integral(fun,0,Inf)
q4 = 1.6449
Functions that take a function as an input (called function functions) expect that the function
associated with the function handle has a certain number of input variables. For example, if you call
integral or fzero, the function associated with the function handle must have exactly one input
variable. If you call integral3, the function associated with the function handle must have three
input variables. For information on calling function functions with more variables, see
“Parameterizing Functions”.
See Also
Related Examples
•
“Create Function Handle” on page 13-2
•
“Parameterizing Functions”
More About
•
“Anonymous Functions” on page 20-20
Pass Function to Another Function
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