recreate vector

I have a compressed vector like this: a_compressed = [9 3 5] a_ending_indx = [4 6 9]

Without using FOR loop, what is the efficient way to uncompress that vector so that the full vector is a = [9 9 9 9 3 3 5 5 5]

Thanks, Sam

Answer 1

[Sean de Wolski]

One of many ways:

a_c = [9 3 5];
a_x = [4 6 9];

B = zeros(1,a_x(end));
B([1 a_x(1:end-1)+1]) = 1;
C = a_c(cumsum(B))

[Sam]

Thanks Sean

Very helpful,

-Sam