how to call a function for each row

Read ?apply

This is easiest:

df <- matrix(c(1,2,3,3,4,6,5,6,1), 3)
apply(df, 1, function(x) 6*x[1]+7*x[2]+8*x[3])

But it's much more efficient to do it with matrix multiplication. In
keeping with the best of tradition, this is left as an exercise to the
reader.

Michael

Hi

?I have ?a data-frame which look like this

X1 X2 X3
1 ? 3 ?5
2 ? 4 ?6
3 ? 6 ?1

I want to apply a formula Y=6*X1 + 7*X2 + 8*X3 ?for every row


Thanks in Advance







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