How to set a default value for my custom function
显示 更早的评论
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.
采纳的回答
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.
更多回答（2 个）
KSSV
2017-7-17
function addnum(mat)
n=numel(mat)
mat+n
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
类别
在 帮助中心 和 File Exchange 中查找有关 循环及条件语句 的更多信息
