question regarding headers with space in the names

Hi,

After I read an xlsx file into the work space:
A <- read.xlsx("B.xls", header = T, check.names = F)
There are several headers with the names like:
colnames(A) [1:4]
# [1] "A 1" ? ? ? ? ? ? ? ? ? ? ? ?"B"
?[3] "C 2" ? ? ? ? ? ? ? ? ? ? ? ? ?"D"
I can get the content of column 2 and column 4 easily by
A$B or A$D

However, I can not type something like
A$A 1 (cause there is a space in between)

Obviously, you can get around this by using something like
A[,colnames(A) == "A 1"]
The other way to get around is to read it by using check.names = T
A <- read.xlsx("B.xls", header = T, check.names = T)
and type something like
A$A.1

But I am wondering if I stick using check.names = F, if there is anything
that is as easy as
A$A 1
that works.

Thanks,

-Jack

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