This is machine translation

Translated by Microsoft
Mouseover text to see original. Click the button below to return to the English version of the page.

Note: This page has been translated by MathWorks. Click here to see
To view all translated materials including this page, select Country from the country navigator on the bottom of this page.

Support Variable Number of Inputs

This example shows how to define a function that accepts a variable number of input arguments using varargin. The varargin argument is a cell array that contains the function inputs, where each input is in its own cell.

Create a function in a file named plotWithTitle.m that accepts a variable number of paired (x,y) inputs for the plot function and an optional title. If the function receives an odd number of inputs, it assumes that the last input is a title.

function plotWithTitle(varargin)
if rem(nargin,2) ~= 0
    myTitle = varargin{nargin};
    numPlotInputs = nargin - 1;
    myTitle = 'Default Title';
    numPlotInputs = nargin;


Because varargin is a cell array, you access the contents of each cell using curly braces, {}. The syntax varargin{1:numPlotInputs} creates a comma-separated list of inputs to the plot function.

Call plotWithTitle with two sets of (x,y) inputs and a title.

x = [1:.1:10];
y1 = sin(x);
y2 = cos(x);
plotWithTitle(x,y1,x,y2,'Sine and Cosine')

You can use varargin alone in an input argument list, or at the end of the list of inputs, such as

function myfunction(a,b,varargin)

In this case, varargin{1} corresponds to the third input passed to the function, and nargin returns length(varargin) + 2.

See Also


Related Examples

More About