[R] how to skip a numeric column for averaging other columns?

[sandsky]

Data has the first row for variable name and the first column for sample
name. I want to take "Log" for all data, but how to compute without the
first column for sample name.

That is, 

column 1: sample ID
column 2-10: data

I want to find an average on each column (2-10)

> log.raw_data=log(raw_data,base=2)
Error in Math.data.frame(list(sample_id = c(1L, 2L, 3L, 4L, 5L, 6L, 7L,  : 
  non-numeric variable in data frame: sample_id

Thank you in advance,

Jin
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