Greetings,
Q #1
--
How does one combine data frames by row ... no cleverness a la
merge(), just add rows.
For example, given A with 20 rows and B with 30 rows, I want C =
combine( A, B) having 50 rows.
Columns having matching names should be filled from both (all)
sources with
Hi Chip,
Try this:
# For Q1
R C1 = rbind(A,B)
or
R C2 = do.call(rbind,list(A,B))
R all.equal(C1,C2) # TRUE
# For Q2
R set.seed(123)
R vx=1:10
R A = matrix(rnorm(500),ncol=10)
R A2=t(sapply(A,rep,10))
R A2[vx,]- A[vx,]
R A2
R dim(A2) # 500 10
R dim(A)# 50 10
HTH,
Jorge
On Fri,
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