Create new vector from data - Counts of element locations in vector

I have kind of a strange specific need for transforming my data to use in a script a colleague has sent me. I'm new to MATLAB, so changing my data should be easier than rearranging the guts of the code.

What I need is to change a vector of numbers (between 0 and 5) to a new vector with 'counts' of the location of the number in the original vector. That's confusing, so for an example:

x = [0,1,0,2,0,3,0,1,1,4]

would become:

y = [2,4,4,6,6,6,8,9,10,10,10,10]

Where the first '2' in y is the location of the '1' at the second location in vector x, etc.

Other than a subset of the find and sum functions, I'm stumped. Thanks in advance for any help, I'm still familiarizing myself with the software.

Answer 1

[Oleg Komarov]

You have to use run-lenght decoding algorithm:

x = [0,1,0,2,0,3,0,1,1,4]

val = find(x);
len = x(val);
rude(len,val)

You can find rude here.

[Neil M]

Beautiful. Thank you for the extremely quick response, this appears to work perfectly.