MATLAB: Collapsing integer data into consecutive integers

cell arrays

I have a matrix of values that include integers >= 0. There are repeats, and also gaps in consecutiveness. I would like to collapse the data into consecutive integers, keeping the order intact.

Example: [ 0 1 4 4 1 5 8 1 4]

would go to

[ 0 1 2 2 1 3 4 1 2]

I can do this with loops and brute force, but I'm wondering if there's any quick way to do this since it is frequently called within a loop?

Thanks!

Best Answer

[~,~,I] = unique([ 0 1 4 4 1 5 8 1 4]);
disp(I-1)

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>> A = [1;1;1;2;2;2;2;2;3;3;4;4;4;4;4;4;4;5;5;5;5;1;1;1;3;3;3;3;3;3];
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B =
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   1
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   1
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   7
   1
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floor(x)==x

Best Answer

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MATLAB: How to create an array that counts the number of consecutive repeating numbers in a given array

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