Hi everyone,

I have a matrix that contains 1000 replicates of a sample of a list of values. I want to group each row (row=replicate) into my defined bin ranges and then calculate the mean and stdev for each of the bin ranges (so I will have 1000 rows but ncol=number of bin ranges). 
I don't know how to group rows in a matrix matrix according to another vector (which is what I think I need to do). 

Thanks for the help,
Muri



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