[R] Problem with rowMeans()

From: ss <affysnp_at_gmail.com>
Date: Thu, 12 Jun 2008 16:42:10 -0400

Hi all,

I have a matrix called 'data', which looks like:

> data[1:4,1:4]

      Probe_ID       Gene_Symbol  M1601           M1602
1 A_23_P105862    13CDNA73            -1.6            0.16
2  A_23_P76435      15E1.2            0.18            0.59
3 A_24_P402115      15E1.2            1.63           -0.62
4 A_32_P227764      15E1.2           -0.76           -0.42

> dim(data)

[1] 23963 85

What I want to do is to make a new matrix called 'data2', which would be transformed
by subtracting the mean of each row from matrix 'data'. There are some 'NA's in the

matrix and I do want to keep it.

I tried to take 'mean's from each row first by using:

a<- rowMeans(data[,3:85],na.rm = FALSE)

but I got:

> a<- rowMeans(data[,3:85],na.rm = FALSE)
Error in rowMeans(data[, 3:85], na.rm = FALSE) : 'x' must be numeric

Can anybody suggest me how to get around this?

Thank you very much!


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