Introduction
A function handle is a data type that stores an association with a function. For example, you can use a function handle to construct anonymous functions. Also, you can use a function handle to pass a function to another function or call local functions from outside the main function.
In this example, we will see how to create a handle for a function and Pass Function to another Function.
Simple Function to calculate y=m*x + c
StraightLine Function
function [x,y]= StraightLine(lower,upper) x= linspace(lower,upper,100); % Calculate y y= 10.*x + 5; end
StraightLine function takes two input arguments lower and upper
x vector has 100 values in between lower and upper bounds.
It calculates the vector y as per the straight line equation
y = 10*x + 5
Outputs: Vector x and y
Let’s create another function to accept the handle and plots the graph for x vs y.
FunctionHandleDemo
function [x,y] = FunctionHandleDemo(f,arg1,arg2)
[x,y] = f(arg1,arg2);
%plot
plot(x,y,'g+');
%labels
xlabel('x');
ylabel('y');
% Plot title
title('Function handle Example');
end
Description of the function:
FunctionHandleDemo accepts Three Input arguments
function handle f
Two input integer arguments arg1 and arg2
Outputs: vectors x and y
Plots x vs y
It invokes the function with arguments arg1 and arg2
Driver script
We need a script to invoke the method above with the function handle.
handle = @StraightLine;
%pass handle,10,20
FunctionHandleDemo(handle,10,20);
