How to set a default value for my custom function
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I hope to create such custom function
function addnum(mat,n=numel(mat))
mat+n
I mean I try to add a number into the element of mtrix mat,but if I don't give a explicit value for n,I hope the n will be the number of the mtrix self.
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Stephen23
2017-7-17
编辑:Stephen23
2017-7-17
Unfortunately MATLAB does not (currently) allow defining default values in the function definition line itself (nor does it allow arguments to be specified by name, only by position). To define a default value you can use the input parser class (I find this slow and pointlessly complex), or simply use nargin like this:
function out = addnum(mat,n)
if nargin<2
n = 3;
end
out = mat+n;
end
For more multiple optional arguments you should consider using a structure or name-value pairs: see my FEX submission num2words for an example of this.
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Lee
2023-2-11
This is the way to define default number in matlab
function addnum(mat,n)
arguments
mat
n=numel(mat)
end
mat+n
end
Be sure to list all arguments in order
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