I want to calculate the mean and the sd from a matrix (14*20) that I import like this from a csv file:
data<- read.csv("data.csv",header=F,sep=";")
Why does this not work:
sd(data) and mean(data)
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Nick Kennedy
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http://stackoverflow.com/questions/9424311/how-to-get-mean-median-and-other-statistics-over-entire-matrix-array-or-dataf see if this answers your question. – goodtimeslim Jun 21 '15 at 20:30
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`read.csv` returns a data.frame, not a matrix. If you want the mean of all 280 numbers, you could do `mat <- data.matrix(data); mean(mat); sd(mat)`. If you intend to do column-wise means and sds then see the linked question by @goodtimeslim. – Nick Kennedy Jun 21 '15 at 20:34