How to pass additional variables into a function handle that is taken as an argument?

How to pass additional variables into a function handle that is taken as an argument?

For example, the integral function is used as:

Q = integral(fun,A,B)

Where fun is initialized as the function handle:

fun = @myFunction

That can be otherwise evaluated as:

y = myFunction(x)

I understand if I need to pass in additional parameters into myFunction, I can do the following:

y = myFunction(x,a,b,c,d)

But how do I do that with the integral function that takes the handle as an argument? Would it be like this?

Q = integral(fun(x,a,b,c),A,B)

Just to put it into perspective, myFunction would be an error evaluating function that returns 20 results at a time in a 20x1 column array. The 20x1 array is then minimized in an optimization algorithm such as the genetic algorithm with multiple objectives, so things like nested functions will not work so well in terms of sharing the extra parameters. Currently, I am using global variables which is working fine but I would like to try to avoid the potential problems as much as possible.

Thanks!

Answer 1

[Walter Roberson]

http://www.mathworks.com/help/matlab/math/parameterizing-functions.html

[Zhangxi Feng]

Well nested function isn't practical for my application.

If I am understanding the article correctly, x = fzero(@(x) cubicpoly(x,b,c),0) only works with anonymous function definition right? My function cannot be defined like that.

[Guillaume]

Of course, your function can be defined with an anonymous function.

Following your example, let's say you want to use myFunction (defined any way you want) with integral with additional arguments a, b, c, and d, then

Q = integral(@(x) myFunction(x, a, b, c, d), A, B)

where @(x) myFunction(x, a, b, c, d) is the anonymous function that binds the arguments to myFunction.

[Zhangxi Feng]

Thanks!