The isempty function returns a boolean that indicates
if the argument variable is empty or not. The general
syntax for its use is
y = isempty(x).
Here are some examples of the isempty function
--> a = []
a =
<double> - size: []
[]
--> isempty(a)
ans =
<logical> - size: [1 1]
1
--> b = 1:3
b =
<int32> - size: [1 3]
Columns 1 to 3
1 2 3
--> isempty(b)
ans =
<logical> - size: [1 1]
0
Note that if the variable is not defined, isempty
does not return true.
--> isempty(x) Error: Undefined function or variable x at <Interactive>