Mulitpling a scalar to specfic numbers in a vector

I need to multiply random numbers in a vector by a different scalar depending on what numbers are in the vector. For example, [1 3 5 10 15 17 20 25 30]; I would have to multiply the 1,3 and 5 by 2, and the 10,15,17 by 5, but the 20,25, and 30 would be multiplied by 10. So the vector would look like [2 6 10 50 75 85 200 250 300].

Answer 1

[Matt J]

One way:

[1 3 5 10 15 17 20 25 30].*repelem([2,5,10],3)

ans = 1×9

2 6 10 50 75 85 200 250 300

[jason]

what would you do if it wasn't in sets of 3

[Torsten]

Then explicitly form the vector of scalars associated with the elements of the random vector.

[1 3 5 10 15 17 20 25 30].*[2 2 2 5 5 5 10 10 10]

ans = 1×9

2 6 10 50 75 85 200 250 300

[Matt J]

what would you do if it wasn't in sets of 3

Use this syntax instead,

B = repelem(A,r1,...,rN)