Hello!

I have a dataset like this:

X1   X2   X3   X4   X5    X6    X7    X8
1     2      2     1     2      3       2      6
2     3      2     5     7      9       1      3
1    9     12     6     1      1       3      6

The columns X1-X6 contains ordinary numeric values. 

X7 contains the number of the first column that the rowMeans should be 
calculated from and 
X8 contains the last column that should be included in the rowMeans.

when I try

test <- (df[,df$X7:df$X8])

the rowMeans are calculated based on the values in the X7 and X8 in the first 
row only.

Thanks in advance!

/Marine
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