How to avoid for-loop here; repmat

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 %

Answer 1

[Star Strider]

If you have R2015a or later, use the repelem (link) function:

fullX = repelem(xval, numX)

[Pete sherer]

Thank you verymuch

[Star Strider]

As always, my pleasure!