stretch

stretch(X, n)

X is a vector/tuple/matrix/table.

n is a non-negative integer.

• If X is a vector or tuple, stretches X evenly to a new vector or tuple with the length of n.

• If X is a matrix or table, stretches X evenly to a new matrix or table with n rows.

The difference between stretch and take lies in:

• take takes n values iteratively and sequentially from a vector, whereas stretch copies each element of the vector to stretch the vector to a new length n.

X = 1 NULL 2 3
print stretch(X, 10)
// output
[1,1,1,,,,2,2,3,3]

print stretch(X, 11)
// output
[1,1,1,,,,2,2,2,3,3]

print stretch(X, 12)
// output
[1,1,1,,,,2,2,2,3,3,3]

print take(X, 10)
// output
[1,,2,3,1,,2,3,1,]

Y=array(INT[], 0, 10).append!([1 NULL 3, 4 5, 6 NULL 8, 9 10]);
print stretch(Y,7)
// output
[[1,,3],[1,,3],[4,5],[4,5],[6,,8],[6,,8],[9,10]]

s=[1 2 3, 4 5 6]
stretch(s, 5)
// output
([1,2,3],[1,2,3],[1,2,3],[4,5,6],[4,5,6])

m=matrix(1 2 3, 4 5 6)
stretch(m,5)
// output
col1        col2
1   4
1   4
2   5
2   5
3   6

t=table(1 2 3 as a, 4 5 6 as b)
stretch(t,5)
// output
a   b
1   4
1   4
2   5
2   5
3   6