What Is Function Handle in MATLAB: Simple Explanation and Example

A function handle in MATLAB is a way to refer to a function indirectly by storing its reference in a variable. It lets you call the function later or pass it as an input to other functions without calling it immediately.

How It Works

Think of a function handle as a remote control for a function. Instead of pressing the button (calling the function) right away, you hold the remote (the handle) and decide when to press it later. This lets you pass the remote to someone else or store it for future use.

In MATLAB, when you create a function handle, you are not running the function immediately. Instead, you create a pointer or reference to that function. Later, you can use this handle to call the function with specific inputs. This is useful when you want to use functions as inputs to other functions or when you want to delay execution.

Example

This example shows how to create a function handle for the built-in sin function and use it to calculate the sine of a value.

matlab

f = @sin;
result = f(pi/2);
disp(result);

Output

1

When to Use

Use function handles when you want to pass functions as arguments to other functions, such as optimization or integration routines. For example, MATLAB's fzero function finds roots of equations and requires a function handle as input.

They are also helpful when you want to store a list of functions and call them dynamically, or when you want to delay the execution of a function until certain conditions are met.

Key Points

• A function handle stores a reference to a function without calling it.
• Use the @ symbol to create a function handle.
• Function handles can be passed as inputs to other functions.
• They enable flexible and dynamic function calls.

Key Takeaways

A function handle lets you refer to a function without running it immediately.

Create a function handle using the @ symbol followed by the function name.

Function handles are useful for passing functions as arguments to other functions.

They allow delayed or dynamic execution of functions.

Commonly used in MATLAB functions like fzero, integral, and optimization routines.