Last Updated : 14 Dec, 2022
The basics of Function Argument is, ” The functions receive certain inputs from the calling command which applies in function syntax and processes it. sometimes It may or may not produce output argument it dependence completely on the functions efficiency or the accuracy of your code.”
Function Argument:
The communication between values and defined called function, using calling argument or parameters that are called function argument. And the technique or the way of declaring the specific restrictions on function parameters using a validation process is called Function Argument Validation.
In Programming, there are two types of argument considered –
- Actual Argument – It’s a kind of called function which is used on calling time, like whatever argument we are passing that is called an Actual Argument.
- Formal Argument – A defined function that contains some operation is called a Formal Argument.
Block Syntax for Function Validation
Function defines the arguments or parameters in a particular block of code, which is known as syntax. So here below we take an example of function block syntax, and it’s helping to reduce the function errors.
function validateFunction( inputArgument)
arguments
inputArgument
%% Specify the size, className,Function and default values.
end
% Function code
end
So as you can see here we have taken a formal argument (parameter) function. the function name is a validated function that will pass the same input parameters according to the requirement. After that, we have to declare the statement inside the arguments like whatever we want to execute through functions like the size, class name function, and default values.
The function argument validation has some criteria when we write our code in the editor so we have to make sure that the argument declaration can include the same kinds of restrictions shown below.
- Size – The length of each dimension should be enclosed in parentheses ( ), it specified nonnegative integer numbers or colons (:).
- Class – In MATLAB when we define the class so it should be in a word. it can be a char, string, or user-defined class.
- Function – Inside the argument, we can use a number of functions that should be enclosed in curly brackets { fnc1, fnc2, ……, fancy}.
So, let’s start with how to find the Number of function arguments you have to just use the MATLAB tool to run the following programs.
We have two types of Number argument Validation
nargin in Argument Validation:
nargin means a number of argument inputs, using (nargin) switch case we execute a statement based on the number of inputs that have been provided.
Example 1:
Matlab
%% Find the number of function argument
% using Number of argument
% inputs MATLAB program
function c = addme(a,b)
switch nargin
case 2
c = a + b;
case 1
c= a + a;
otherwise
c = 0;
End
Output:
>> addme(42) ans = 84 >> addme(2,4000) ans = 4002 >> addme ans = 0
nargout in Argument Validation:
nargout means the Number of arguments output, that identified the number of output that has been requested by the user.
Example 2:
Matlab
% Find the number of function argument
% using number of argument
% output MATLAB program
function [result,absResult] = addme2 (a, b)
switch nargin
case 2
result = a + b;
case 1
result = a + a;
otherwise
result = 0;
end
if nargout > 1
absResult = abs(result);
End
Output:
>> value = addme2(11, -22) value = -11 >> [value, absValue] = addme2(11, -22) value = -11 absValue = 11
Validate the Number of Function Argument
We can also have a custom function check whether it receives a valid number of inputs or outputs. MATLAB does perform some argument checks automatically for the others we have check (nargin) check and (nargout) check. in cases where a number of inputs are defined in the functions definition MATLAB check whether the function has received more number of argument than expected.
Example 3:
Matlab
% MATLAB Code
function [x , y] = myFunction( a,b,c)
[x , y] = myFunction(1,2,3,4)
Output:
Error using myFunctionToo many input arguments.
In the above example definition of myFunction is clearly defined that it will take only three input arguments are expected. so if we pass more than three arguments MATLAB throughs an error, so we have to ensure that how many arguments we are passing through function definition. so in this condition MATLAB check automatically, there is no need to use nargin and nargout check.
Example of Function Argument Validation
Here we take an example of the Define Repeating Positional Input Argument, this kind of argument that can be repeated zero or more times to a function call. so, in this program RepeatFunction function accepts repeating arguments a, b, and style. in the function a and b to vector of double values, and Restricted style to the string “–” and “:”.
Write a program in MATLAB editor-
Matlab
% MATLAB Code
function RepeatFunction(a,b,style)
arguments(Repeating)
a(1,:)double
b(1,:)double
style{mustBeMember(style,["--",":"]}
end
x = reshape([a;b;style],1,[]);
if ~isempty(x)
plot(x{:});
end
end
Output:
After writing all the required input into Command Window again we hit Enter then we will get the figure output of the Repeating function argument program.
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Function Argument Validation
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FAQs
The communication between values and defined called function, using calling argument or parameters that are called function argument. And the technique or the way of declaring the specific restrictions on function parameters using a validation process is called Function Argument Validation.
What is the function argument validation in MATLAB? ›
Function argument validation is a way to declare specific restrictions on function arguments. Using argument validation you can constrain the class, size, and other aspects of arguments without writing code in the body of the function to perform these tests.
What is an example of a function argument in MATLAB? ›
For example, if you create a function named myplot with repeating arguments X , Y , and style , the function accepts multiple sets of these three arguments, such as myplot(x1,y1,style1,x2,y2,style2) . MATLAB creates a cell array that contains all the values passed in for that argument.
How do you make a function accept an argument? ›
To make a function that accepts any number of arguments, you can use the * operator and then some variable name when defining your function's arguments. This lets Python know that when that function is called with any position arguments, they should all be captured into a tuple (which that variable will point to).
How do you make a function argument optional in MATLAB? ›
MATLAB lets you ignore arguments by passing a tilde character ( ~ ) in place of the argument. You can define a function that ignores unused positional arguments by adding a tilde character ( ~ ) in the arguments block corresponding to the position of the argument in the function signature.
What is function validation? ›
Define Validation Functions
Validation functions determine when to throw errors and what error messages to display. Functions used for validation have these design elements: Validation functions do not return outputs or modify program state. The only purpose is to check the validity of the input value.
What is the use of argument function? ›
In mathematics, an argument of a function is a value provided to obtain the function's result. It is also called an independent variable. , is called a unary function. A function of two or more variables is considered to have a domain consisting of ordered pairs or tuples of argument values.
What are the three types of function arguments? ›
Types of Function Arguments in Python
- Default Arguments.
- Keyword Arguments.
- Arbitrary Arguments.
- Required Arguments.
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 .
How do you find the number of function arguments in MATLAB? ›
nargin( fun ) returns the number of input arguments that appear in the fun function definition. If the function includes varargin in its definition, then nargin returns the negative of the number of inputs. For example, if function myFun declares inputs a , b , and varargin , then nargin('myFun') returns -3 .
If the number of arguments to be passed into the function is unknown, add a (*) before the argument name.
How many arguments can a function have? ›
There is no maximum limit to pass parameters or arguments to a user defined function.
What is the difference between function arguments and parameters? ›
Luckily, it's not hard to wrap your head around the differences. A parameter is a variable in a function definition. It is a placeholder and hence does not have a concrete value. An argument is a value passed during function invocation.
What is the argument of a function in MATLAB quizlet? ›
What are the "arguments" of a function? They are the input values passed to the function so that it can perform its computation. These values appear in parentheses after the function name. In MATLAB several functions default to along the first non-singleton dimension, if you do not provide a dimension argument.
How do you overload a function in MATLAB? ›
To overload a MATLAB function: Define a method with the same name as the function you want to overload. Ensure that the method argument list accepts an object of the class, which MATLAB uses to determine which version to call. Perform the necessary steps in the method to implement the function.
How do you pass command-line arguments in MATLAB? ›
To pass command-line arguments to a MATLAB executable, you define a single MATLAB function in the executable. The arguments to the function are taken from the command line parameters (the first command-line parameter is the first argument, and so on).
What is argument based validation? ›
An argument-based approach to validation redresses the balance by linking the kinds of evidence needed to validate a test-score interpretation to the details of the interpretation.
What is the variable argument function in MATLAB? ›
The varargin argument is a cell array that contains the function inputs, where each input is in its own cell. Define a function that returns a variable number of output arguments using varargout . Output varargout is a cell array that contains the function outputs, where each output is in its own cell.
What is a function handle as an argument in MATLAB? ›
A function handle is a MATLAB® data type that represents a function. A typical use of function handles is to pass a function to another function. For example, you can use function handles as input arguments to functions that evaluate mathematical expressions over a range of values.
What is the function bvp4c in MATLAB? ›
bvp4c produces a solution that is continuous on [a,b] and has a continuous first derivative there. Use the function deval and the output sol of bvp4c to evaluate the solution at specific points xint in the interval [a,b].
