Functions and types of user defined functions in
- 1. Functions And Types of user defined functions in MATLAB K.RAMYA SREE 18BF1A0485
- 2. Introduction and why to use functions. Function set of statements that performs specific task.(it can accept multiple input arguments and give more than one output argument.) Need to use functions: Functions provide reusable code. We use same code in more than one place without rewriting the program. Reuse code by calling in different programs. Types of functions: functions in MATLAB Built in functions User defined functions.
- 3. User defined functions. Before we start: Identify the function Decide the name of the function Decide the input variables of the function. Decide the output variables of the function. File name must be function name.
- 4. Functions with variations in outputs
- 5. How to call user-defined functions
- 6. Types of user defined functions Let’s see the few more ways of defining a function as per the user needs. • Anonymous Functions • Sub Functions • Nested Functions • Private Functions
- 7. Anonymous Functions It is an inline function with one output variable. A user can’t access/call an anonymous function from outside the file. User can define an anonymous function in the command prompt or within a script or function file. They can contain only a single executable statement. Syntax: output = @(arguments) expression Parameters: output = output to be returned arguments = required inputs to be passed expression = a single formula/logic The inline command lets you create a function of any number of variables by giving a string containing the function followed by a series of strings denoting the order of the input variables. sqr = @(x) x.^2; a = sqr(5) a=25
- 8. Sub Functions/local functions In a function file, the first function in the file is called the main function(primary function). This function is visible to functions in other files, or you can call it from the command line. Additional functions within the file are called local functions, and they can occur in any order after the main function. Local functions are only visible to other functions in the same file.They are equivalent to subroutines in other programming languages, and are sometimes called subfunctions.cannot be accesed from command line Syntax: function output = mainFunction(x) . . . . . . subFunction(y) . . . . . . end function result = subFunction(y) . . . . . . end
- 9. Nested Functions Unlike Sub functions, Nested functions are defined inside the primary functions. The scope of a nested function is within the file. One can’t access the nested function from outside the file.
- 10. Private Functions The name itself suggests that these functions are private and will only be visible to limited functions/files. These functions files are stored in a separate subfolder named private. Generally, we can’t access files that are not in the current path/folder. But this works for private functions. These functions reside in subfolder and accessible to the parent folder and private folder itself Private functions are useful when you want to limit the scope of a function.
- 11. Subtractor(x,y)
- 12. In the above case, you can observe the error when we try to access private functions from the location other than the parent folder.
- 13. The program compiled successfully and gave the output when we tried to access the private function from adder function which is stored in the parent folder. One must check the current file path while working on private functions.
- 15. Thankyou