How to avoid for-loop here; repmat

2 views (last 30 days)
Hi Could anyone help suggest a faster way to construct this vector?
xval = [1 2 7 9];
numX = [1 4 2 3];
% I want final output to be [1 2 2 2 2 7 7 9 9 9];
fullX = [];
for runi=1:length( xval)
tval = xval( runi);
n = numX( runi);
if n > 0
fullX= [ fullX; repmat( tval, n, 1)];
end
end %

Accepted Answer

Star Strider
Star Strider on 17 Sep 2018
If you have R2015a or later, use the repelem (link) function:
fullX = repelem(xval, numX)

More Answers (0)

Categories

Find more on Creating and Concatenating Matrices in Help Center and File Exchange

Community Treasure Hunt

Find the treasures in MATLAB Central and discover how the community can help you!

Start Hunting!