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Re: how to find unique rows and calculate the average.
Posted:
Apr 10, 2013 10:16 PM


Alan, if you have access to the Statistics Toolbox, a combination of cell2dataset (or create the dataset array directly by reading a file) and grpstats solves this easily. Use UniqueID as the grouping variable.
Hope this helps.
On 4/9/2013 5:32 PM, Alan Hitch wrote: > 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



