[R] Summarizing a matrix

[Özgür Asar]

Hi,

x<-matrix(0,80,ncol=1)

will create x matrix with all elements 0 (to be filled by the sums that you
need)

sum(y[y[,4]==1,5]) 

will calculate the sum of 5th column of y with 4th column=1

Similarly, 

sum(y[y[,4]==80,5])

 will calculate the sum of 5th column of y with 4th column=80.

You can adapt this to your case, with simple loops, etc.

Hope this helps.
Ozgur

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