matlab中如何判断一个矩阵是否为空？

Question

In my matlab program, I want to determine whether a variable or output of a function is empty or not, before going further.

Actually, I've written a function which calculates an intersection point between two line segments. if there is no intersection, the function returns nothing (so the variable assigned by the function will be empty matrix).

I know I could use size function but is there any better way to do that?

Answer 1

You can use isempty . For instance:

>> isempty([])

ans =
     1

>> isempty([42])

ans =
     0