creating a vector from a bin count
3 views (last 30 days)
Show older comments
Hello,
I have a matrix I got from another source that look like:
[0 5; 1 2; 2 1]
I wish to get a vector like [0 0 0 0 0 1 1 2] .
Thanks
EC
0 Comments
Accepted Answer
More Answers (1)
Rik
on 23 May 2019
You could of course do this with a loop (or cellfun), but I think a more elegant solution is with cumsum instead.
data=[0 5; 1 2; 2 1];
delta=data(:,1)-[0;data(1:(end-1),1)];
change_pos=[0;cumsum(data(1:(end-1),2))]+1;
out=accumarray(change_pos,delta);
out=cumsum(out);
The idea in this code is to do this:
%repeat 0 for 4 entries, 1 for 1 entry, and don't repeat 2
[0 x x x x 1 x 2]
%by setting x to 0, cumsum will create the desired matrix
0 Comments
See Also
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!