Calculate across columns

I'd like to perform some calculations across a series of columns. Is there an
easy way to do so? For example, I'd like to calculate the maximum value from
columns 6-42. Although I can use, say:

pmax(data[,6],data[,7],data[,8], etc.), I'd prefer to be able to do
something like

pmax(data[,6:42]). Unfortunately, doing so returns 36 columns. 

Thanks,
Tim

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