data storage, reduce the repeated elements, recurrence

if input is:

a = [5 5 1 6 6 6 4 4 2]

how to get the output as:

elements: [5 1 6 4 2]

recurrence: [2 1 3 2 1]

Answer 1

[Stephen23]

That is called run length encoding. Download this:

https://www.mathworks.com/matlabcentral/fileexchange/41813-runlength

Or search FEX yourself:

https://www.mathworks.com/matlabcentral/fileexchange/?term=run+length+encoding

[hamed amini]

Not sure if I am doing something wrong, but RunLength looks for RunLength.c which is not there.

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Ok = InstallMex('RunLength.c', 'uTest_RunLength');

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RLE worked perfectly:

https://uk.mathworks.com/matlabcentral/fileexchange/31123-rle-run-length-encoding

[Adam]

RunLength.c is definitely included in the download zip

[Jan]

@hamed: Click on the "Download" button on the top right to obtain the zip file, which contains the required C file. You need a C compiler to convert the C file to a mex function. Alternatively you can use the slower RunLength_M version.