isNull
Syntax
isNull(X)
Arguments
X is a scalar/pair/vector/matrix.
Details
Return 1 if an element is Null.
Examples
$ isNull(00i);
1
$ isNull(1 NULL NULL 6 NULL 7);
[0,1,1,0,1,0]
$ isNull(1/0);
1
$ x=1 NULL 5 NULL 4 6$2:3;
$ x;
#0 |
#1 |
#2 |
|---|---|---|
1 |
5 |
4 |
6 |
$ isNull(x);
#0 |
#1 |
#2 |
|---|---|---|
0 |
0 |
0 |
1 |
1 |
0 |