Hi All,

There are a variety of functions that can be applied to a variable 
(column) in a data frame: mean, min, max, sd, range, IQR, etc.

I am aware of only two that work on the rows, using q1-q3 as example 
variables:

rowMeans(cbind(q1,q2,q3),na.rm=T)   #mean of multiple variables
rowSums (cbind(q1,q2,q3),na.rm=T)   #sum of multiple variables

Can the standard column functions (listed in the first sentence) be 
applied to rows, with the use of correct indexes to reference the 
columns of interest?  Or, must these summary functions be programmed 
separately to work on a row?

Thanks,

Gerard



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