~ in function definition

Looking at some previous code I found a function that is defined as function(x,y,z]=fun(~,~,~)

what are the ~ doing in the input list?

Answer 1

[the cyclist]

The function input will be ignored. It is described here:

http://blogs.mathworks.com/loren/2009/09/11/matlab-release-2009b-best-new-feature-or/

[泽洲]

Thank you~