ifValid

Syntax

ifValid(X, Y)

Arguments

X is a scalar/pair/vector/matrix.

Y is a scalar/pair/vector/matrix.

X and Y must have the same data type.

Details

Determine whether X is NULL. If it is NULL, the value of X is returned, if not , the value of Y is returned.

Examples

$ x = take(1..5 join NULL 6,7)
$ y = 1..7
$ ifValid(x,y)
[1,2,3,4,5,6,6]
$ x1 = int(take(1..5 join int(),6))$2:3
$ y1 = int(take(100,6))$2:3
$ ifValid(x1,y1)

col1	col2	col3
1	3	5
2	4	100

If X is a vector and Y is a matrix with n rows and m columns, the length of X is n*m.

$ m=int(take(1..4 join NULL 8,6))
$ ifValid(m,y1)
[1,2,3,4,100,8]