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838.204
2011 Nov 29
1
Sum matrix by rows, conditional on value
I'd like to sum a matrix only where the matrix meets a specific condition.
The matrix has 365 rows and about 50,000 columns.
str(cdem.mat.yr)
num [1:365, 1:41772] -43.5 -48.4 -45.9 -38.4 -32 ...
I'm having trouble replicating this because it is not working out for me,
so I'm unsure I can provide an solid working example (apologies).
I would like to subset my matrix where the values