Consider a data frame (x) with 2 variables, x1 and x2, having equal values.
It looks like:
x1 x2
1 1
2 2
3 3
Now, consider a second data frame (xk):
xk1 xk2
0.5 0.5
1.0 0.5
1.5 0.5
2.0 0.5
0.5 1
1.0 1
1.5 1
2.0 1
0.5 1.5
1.0 1.5
1.5 1.5
2.0 1.5
0.5 2
1.0 2
1.5 2
2.0 2
I have written code to calculate some differences between these two data
sets; the main idea is to subtract off each element of xk1 from each value
of x1, and similarly for xk2 and x2. This is what I have:
w1 <- array(NA,dim=c(nrow(xk),length(x$x1)))
w2 <- array(NA,dim=c(nrow(xk),length(x$x2)))
for (j in 1:nrow(xk)) {
w1[j,] <- abs(x$x1-xk$xk1[j])
w2[j,] <- abs(x$x2-xk$xk2[j])
}
Is there a way to do the above calculation without use of a FOR loop?
Thank you
Derek
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