# What is an input parser?

Table of Contents

## What is an input parser?

The Input Parser provides a consistent way to validate and assign defaults to inputs, improving the robustness and maintainability of your code. To validate the inputs, you can take advantage of existing MATLAB® functions or write your own validation routines.

## In which case would you use Varargin?

Description. varargin is an input variable in a function definition statement that enables the function to accept any number of input arguments. Specify varargin by using lowercase characters. After any explicitly declared inputs, include varargin as the last input argument .

**How do you validate a string input in MATLAB?**

matchedStr = validatestring( str , validStrings , funcName , varName , argIdx ) includes the position of the input in your function argument list as part of any generated error messages. Use this syntax to format any generated error messages.

### How do you get input in MATLAB?

x = input( prompt ) displays the text in prompt and waits for the user to input a value and press the Return key. The user can enter expressions, like pi/4 or rand(3) , and can use variables in the workspace. If the user presses the Return key without entering anything, then input returns an empty matrix.

### What is Varargin Nargin?

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.

**How do I use Varargout in MATLAB?**

Specify varargout using lowercase characters, and include it as the last output argument after any explicitly declared outputs. When the function executes, varargout is a 1-by-N cell array, where N is the number of outputs requested after the explicitly declared outputs.

## How do you check if input is a number in MATLAB?

TF = isnumeric( A ) returns logical 1 ( true ) if A is an array of numeric data type. Otherwise, it returns logical 0 ( false ). Numeric types in MATLAB® include: int8 , int16 , int32 , int64 , uint8 , uint16 , uint32 , uint64 , single , and double .

## What is a text scalar in MATLAB?

A text scalar is a single piece of text, but the definition varies by data type: For string arrays, a single piece of text is a 1-by-1 scalar, such as “text” . The empty string “” and missing strings are special cases that also count as single pieces of text.

**What is input function example?**

The input() function converts all the user input to a string even if that’s the number. Example: Input with Prompt. >>> age = input(‘Enter Your Age: ‘) Enter Your Name: 25 >>> age ’25’ >>> type(age) User can enter Unicode characters as well, as shown below. Example: input() with Unicode Chars.

### What does Varargin {:} mean in MATLAB?

varargin{:} creates a comma-separated list. On the right hand side of your example, the syntax is being used to create function call arguments.

### What is Nargin and Nargout in MATLAB?

nargin(‘ fun ‘) returns the number of declared inputs for the M-file function fun or -1 if the function has a variable of input arguments. n argout returns the number of output arguments specified for a function. nargout(‘ fun ‘) returns the number of declared outputs for the M-file function fun . Examples.

**What does Varargout mean in MATLAB?**

varargout is an output variable in a function definition statement that enables the function to return any number of output arguments. Specify varargout using lowercase characters, and include it as the last output argument after any explicitly declared outputs.