Here are three ways:
# read in data
Lines - object1 object1 78
object1 object2 45
object1 object3 34
object1 object4 45
object2 object2 89
object2 object3 32
object2 object4 13
DF - read.table(textConnection(Lines))
# 1 - xtabs
xt - as.matrix(xtabs(V3 ~., DF))
# 2 - reshape
wide - reshape(DF, direction = wide, idvar = V1, timevar = V2)
rownames(wide) - wide$V1
colnames(wide) - sub(.*[.], , colnames(wide))
wide - as.matrix(wide[,-1])
# 3 - [
mat - matrix(0, nlevels(DF$V1), nlevels(DF$V2),
dimnames = list(levels(DF$V1), levels(DF$V2)))
mat[cbind(DF$V1, DF$V2)] - DF$V3
On 8/5/06, Ffenics [EMAIL PROTECTED] wrote:
Hi there
I have a list that looks like this
object1 object1 78
object1 object2 45
object1 object3 34
object1 object4 45
object2 object2 89
object2 object3 32
object2 object4 13
but i want to create a matrix like this in order to use the dist function of R
object1 object2 object3 object4
object1 78 45 3445
object245 89 32
13
Is there a method in R that will take a list and format it in this way?
Any help much appreciated.
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