mask
Syntax
mask(X, Y)
Arguments
X is a scalar/vector/matrix.
Y is a conditional expression that generates true or false.
Details
Apply Y on each element of X. If the result is false, keep the element; if the result is true, change it to NULL. The result is of the same length as X.
Examples
x=1..10
mask(x, x>6);
// output
[1,2,3,4,5,6,,,,]
m=matrix(1 2 3, 4 5 6, 7 8 9);
m;
#0 | #1 | #2 |
---|---|---|
1 | 4 | 7 |
2 | 5 | 8 |
3 | 6 | 9 |
mask(m, m<6);
#0 | #1 | #2 |
---|---|---|
7 | ||
8 | ||
6 | 9 |