matrix add in matlab

how do i write i code for [ 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 ]

please help

Answer 1

[John D'Errico]

Simple.

v = [ 1 1 2 2 2 3 3 3 4 4 4 5 5 5 6 ];

I suppose, if your real question is if you knew the number of replicates for each element, you might use a code like replicator. I've attached it, although I am sure there must be a similar code on the file exchange.

v = replicator(1:6,[2 3 3 3 3 1])'
v =
   1 1 2 2 2 3 3 3 4 4 4 5 5 5 6

[Steven Lord]

There's a "similar code" in MATLAB as of release R2015a.

 v = repelem(1:6, [2 3 3 3 3 1])

[John D'Errico]

Nifty. I learn something new every day here.