search for: 5nm

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2007 Jun 07
1
Averaging across rows & columns
...replicates should be averaged every 14 rows (for more detail, to measure fruit color using a spectrometer, I recorded three readings per fruit -replicates- that I need to average to get one reading per fruit; each row is a point in the light spectrum and I need to calculate an average reading every 5nm -14 rows- for each fruit). Someone proposed to another user who wanted an avg across columns to do a <- matrix(rnorm(360),nr=10) b <- rep(1:12,each=3) avgmat <- aggregate(a,by=list(b)) I tried doing this to get started with the columns first but it asks for an argument FUN that has no d...