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Hi, Given test <- matrix(c(0,2,0,1,3,5), 3,2) > test[test>0] [1] 2 1 3 5 These are values >0 > which(test>0) [1] 2 4 5 6 These are array indices of those values >0 > which(apply(test>0, 1, all)) [1] 2 This gives the row whose elements are all >0 I can't seem to get indices of rows containing one or more elements >0 [[alternative HTML version deleted]]

Hi Violeta, I compiled with clang -Oz and clang -Oz -mno-red-zone for comparisons against Oz and clang -O0 and clang -O0 -mno-red-zone for comparisons against a default clang. I unfortunately don’t have the clang commit I worked with on my home laptop, and don’t have access to the computer I was using at Apple, so I can’t help you there. Jessica > On Sep 28, 2016, at 11:22 AM, Violeta