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...in all dimensions. Any ideas or references? I'd be happy to share more details as needed. Here is a sample from the data. All together, there are 366 subjects. There are 4 levels of Test_no (1,2,3,4), Ans1 and Ans2 are the within subject measures, and there are 8 levels of Ans* (cor, SE, CP, CPSE, FoM, FoMSE, zero, other). Thanks, again! SID Test_No Ans1 Ans2 1 1 other other 2 1 CPSE CP 3 1 other other 4 1 SE SE 5 1 FoM CP 6 1 FoM CPSE 7 2 cor cor 8 2 cor cor 9 2 cor cor 10 2 CPSE CPSE 11 2 cor cor 12 2 CPSE cor 13 2 CPSE cor 14 3 CP cor 15 3 cor cor 16 3 CP FoM 17 3 cor cor 18 3 cor cor...

I have a 280,000 x 11 matrix with various values and many NA values. What I would like to do is get a vector of every unique value in the matrix. For example: X = [ 1 2 NA 4 3 1 7 NA 2 ] Returns: Unique_X = [ 1, 2, 3, 4, 7] Thanks, Todd [[alternative HTML version deleted]]