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how to find unique rows and calculate the average.
Posted:
Apr 9, 2013 5:32 PM


I have a matrix (2563x19) with text and numeric characters. The first row is a header.
e.g. [Site Marshtype Date Species Throw Season Year UniqueID Total Pass1 Pass2 Pass3 Pass4 Pass5 Pass6 Pass7 Pass8 Pass9 Pass10 3BAB Brackish 27Oct04 PAPU 2 Fall 2004 3BAB38287PAPU 35 25 9 0 1 0 0 0 0 0 0 3BAB Brackish 27Oct04 POLA 2 Fall 2004 3BAB38287POLA 79 46 19 9 5 0 0 0 0 0 0 3BAB Brackish 27Oct04 GAAF 2 Fall 2004 3BAB38287GAAF 64 45 13 6 0 0 0 0 0 0 0 3BAB Brackish 27Oct04 CYVA 2 Fall 2004 3BAB38287CYVA 11 2 4 2 3 0 0 0 0 0 0 3BAB Brackish 27Oct04 LUPA 2 Fall 2004 3BAB38287LUPA 20 11 2 4 2 1 0 0 0 0 0]
I would like to get average values (Total) of particular rows that have identical column values (column of interest is UniqueID) and create a new matrix with the calculated mean and associated UniqueID. For each UniqueID there are between 2 and 3 values.
Like this:
[3BAB38287PAPU 234 3BAB38287POLA 456 3BAB38287GAAF 35]
Could someone help me with this? I have tried a lot of things and nothing seems to be working.
Thanks Alan



