nones

fill each row/column with a certain number of ones (N-ONES)

NONES - fill each row/column with a certain number of ones (N-ONES)
A = NONES(V) creates a logical array A, in which each row/column
starts with zero or more TRUE entries followed by zero or more FALSE
entries, as specified by the elements of the vector V.

Examples
nones([1 0 4]) % ->
1 0 1
0 0 1
0 0 1
0 0 1

a = nones([-2 3 2 7].') ;
b = cumsum(a,2) ;
b(~a) = 0 % ->
0 0 0 0 0 0 0
1 2 3 0 0 0 0
1 2 0 0 0 0 0
1 2 3 4 5 6 7