From A = [5,2,3] and B = [1,2,3,4,5,6,7,8,9,10] produce a vector C where :
C(1) is the sum of the first A(1) elements of B,
C(2) is the sum of the next A(2) elements of B, etc.
c(i) = 0 if A(i) = 0.
out-> [15 13 27];
Numbers with prime factors 2, 3 and 5.
Basics: Divide integers to get integer outputs in all cases
Matrix which contains the values of an other matrix A at the given locations.
First non-zero element in each column
A quadrant matrix
Remove NaN ?
Create a matrix X, where each column is a shifted copy of the vector v
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