You create two separate instances of the function counter which will increment independently.
Functions in matlab plus#
increment stores value in its handle, so each time increment is called, value is incremented and overrides the first definition of value=0.Īs a result, the output is 0 plus the number of times increment is called, which is each time a given instance of counter is called. So in the example, the function counter sets the variable value to 0 then calls increment.
Stores not only the name of the function, but also the values of When you create a function handle for a nested function, that handle This local workspace is separate from the workspace you access at the MATLAB command prompt, called the base workspace. These functions operate on variables within their workspace, called the local workspace. Variables defined in a parent function, also called externally scoped variables Functions in MATLAB are defined in separate files and should have the same name as the file. Variables defined within the nested function Nested functions can use variables from three sources: Input arguments
Functions in matlab manual#
I found this paragraph in the manual very instructive: add variable to legend matlab Code Answers add variable to legend matlab The example below will show the way of writing this type of function in MATLAB. I never used nested functions with handles before, so here is my thought process: This code is created so it exploits this attribute of function handles (its the same thing, but its copied twice). Ī good way of seing the differences better is to redefine the function as: function fcnHandle = counter(val)įcnHandle = calling it like: > f1 = counter(0) As this specific function (increment) relies in a saved internal value for its computation, you can observe how if called as in your code sample, outputs. So if called twice, like in the code (f1, f2) each time will return the same function (increment) but different handles. This function handle is a handle to a function called increment, that takes its own variable value, and increments its by one. Initializing f2 = counter(), creates another counter with a separate saved workspace.Įach time the function counter() its called creates an unique function handle. To differentiate functions from scripts in MATLAB, the keyword function appears in the first line of the text content, right at the beginning. Functions and scripts consist of text files with a.
įinally, is assigned to f1 and all f1() is doing is on the previously initialized value. A script refers to a file that consists of several sequential lines of MATLAB commands. With the scoped workspace retaining: s.workspaceīasically, counter() initializes the value to zero, and successive calls to will perform value = value+1.
This use of nested functions is relevant for memoization (for additional reading see: use nested functions to memoize costly functions), since it exploits parametric function handles which store the value of the parameters at creation.Ĭounter() returns a function handle directly to the nested function f1 = counter()į1 nested function will 'save' the scoped variables.
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