nargin

nargin is a function in MATLAB that returns the number of input arguments that were passed to a function. It is a dynamic argument count variable, meaning its value changes depending on how many arguments are supplied when the function is called. When a function is defined, nargin can be used within the function's body to check the number of inputs provided by the user. This allows for flexible function design, enabling functions to behave differently based on whether optional arguments are included or not. For example, a function might have a default value for a parameter if it's not explicitly provided, and nargin can be used to detect this. The value of nargin is always an integer greater than or equal to zero. It is a built-in keyword and does not need to be declared as a variable. Understanding and utilizing nargin is crucial for writing robust and user-friendly MATLAB functions that can adapt to varying input conditions.