Function functions, MATLAB Programming

Function Functions:

The one reason for using function handles is to be able to pass functions to the other functions-these are known as function functions.

For illustration, let's say we have a function which generates an x vector. The y vector is generated by computing a function at each of the x points, and then such points are plotted.

 

1114_Function Functions.png

What we want is to be able to pass the function to be the value of funh, such as sin, cos, tan, and so forth. It doesn't work to merely pass the name of the function:

>> fnfnexamp(sin)

??? Error using ==> sin

Not enough input arguments.

 

Rather than, we have to pass the handle of the function:

>> fnfnexamp(@sin)

which generates the y vector as sin(x) and then brings up the plot as shown in figure.

 

753_Function Functions1.png

Passing rather the handle to the cos function would graph cosine rather than of sine:

>> fnfnexamp(@cos)

We can also pass the handle of any user-defined or anonymous function to the fnfnexamp function.

The other way of doing this is to use the built-in function str2func which will convert a string into a function handle:

 

2434_Function Functions2.png

This would also be called by passing a string to the function, and again would generate the similar plot:

>> fnstrfn2('sin')

There is also a function func2str which will convert a function handle into a string. This can be used to put the name of the function in the plot as shown in above figure.

Though these techniques also work, it seems easier and cleaner to merely pass the function handle to the function.

The MATLAB has few built-in function functions. The one built-in function is fplot that plots a function between the limits which are specified. The format of the call for fplot is:

fplot(fnhandle, [xmin xmax])

Posted Date: 10/22/2012 1:09:24 AM | Location : United States







Related Discussions:- Function functions, Assignment Help, Ask Question on Function functions, Get Answer, Expert's Help, Function functions Discussions

Write discussion on Function functions
Your posts are moderated
Related Questions
Generates sin or cos wave using plot functions: The script generates an x vector; iterating through all the values from 0 to 2*π in steps of 2*π /40 gives sufficient points to

what are the difference between a.linear permutation b.circular permutation

matlab code for path and adjancy martix between pixels

Creating matrix variables- arguments: The CAT arguments dimensions are not reliable. The Iterators can also be used for the values on the rows by using the colon operator;

how to write the national log (ln(x)) in matlap ?

This assignment is designed to compare performance between Matlab and Excel for performing nonlinear regression analysis of a set of data. There are two data sets in the accompa

Q. Explain Power system toolbox ? Power system toolbox (PST) was developed to enable users to perform power system analysis within MATLAB. PST may be used on any computer syste

clear clc %% DATA INPUT filename = input('Enter file name, including its extension: ', 's'); D = load(filename); %or load('Mphi.out'); %% %Trendline %Evaluates

cAN Can I learn Metlab .I am X Scientist in DigitalCommunication. Can U please help me.I know the programming concepts

Example of Referring elements: the vector can also be extended. For illustration, the following generates a vector which has three elements. And then referring to the fourth e