[R] Problem with rowMeans()

[Erik Iverson]

Hello -

ss wrote:
> 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
> 

Do you really have a matrix, or a data.frame?

Try

 > class(data)


> 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.

See ?scale

> 
> 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?

Figure out what you are giving the rowMeans function.
If you really have a matrix, then

all(apply(data[,3:85], 2, class) == "numeric") should be TRUE.



> 
> Thank you very much!
> 
> Allen
> 
> 	[[alternative HTML version deleted]]
> 
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