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Do you have a suggestion for a name of my function?

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I have written a nice little function which I would like to put on the File Exchange. However, I am still looking for a short and decent name for it. So I thought to ask here, for inspiration.
The function takes a vector that can contain consecutive identical elements. It returns an index vector that (re-)starts counting from 1 whenever V changes. An example
V = [10 10 10 4 4 10 9 9 9 9 9]
% and a call to MyFunction(V) returns
[ 1 2 3 1 2 1 1 2 3 4 5]
Any suggestions are welcome!
  1 Comment
John D'Errico
John D'Errico on 22 Mar 2016
This is sometimes the hardest part of writing a function - what to call it. You want a memorable name, since the user needs to be able to use it, and this helps improve user code readability. A short name would be nice of course. Unused is important too.

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Accepted Answer

Charles Dunn
Charles Dunn on 22 Mar 2016
This is similar to Run Length Coding ( You could call it RunLengthCounter
  1 Comment
Jos (10584)
Jos (10584) on 24 Mar 2016
Alas, no option to accept several answers, but this put me on the track of runs.

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More Answers (5)

Walter Roberson
Walter Roberson on 23 Mar 2016
"BoatyMcBoatFace" (Google it if you missed this current event ;-) )

Stephen Cobeldick
Stephen Cobeldick on 22 Mar 2016
Edited: Stephen Cobeldick on 23 Mar 2016
Nice idea, sometimes I have needed an efficient tool to do exactly that!
Is there any similar inbuilt function? There seems the be little precedent for the name.
The term "run" is commonly used to describe contiguous sequences of one value (e.g. RLE). I find count alone is a little bit misleading, as the function does not count the runs themselves, rather the elements within each run.... however adding the prefix "re" makes it clear that this is no ordinary run counter:
The "shape" of the output also implies some possible names:
and some slightly more esoteric names (aka geek humor):

Jos (10584)
Jos (10584) on 23 Mar 2016
Edited: Jos (10584) on 23 Mar 2016
Thanks for the inspiration!
What about runindex? Or is this confusing with regard to existing functions?
Jan on 23 Mar 2016
It is a cumsum(ones()) with restarts.
The runs are repeating sequences: stammercount
I prefer runindex.

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Jos (10584)
Jos (10584) on 24 Mar 2016
Thanks all! Nice to see, you all agree that RUN (or boat) should be part of the function name. I'll use runindex as the function "indexes runs".
It can also do simple run-length encoding.


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