Adding matrix rows that have the same name?

Try this:

aggregate(as.data.frame(dum.mat.temp), list(row.names(dum.mat.temp)), sum)
Does anyone know if there is an R function that will take a matrix like this

jim ? ? 1 ?0 ?0 ?0 ?0 ?0
jim ? ? 0 ?1 ?0 ?0 ?0 ?0
jim ? ? 0 ?0 ?1 ?0 ?0 ?0
bob ? ?1 ?0 ?0 ?0 ?0 ?0
bob ? ?0 ?0 ?1 ?0 ?0 ?0
harry ?0 ?0 ?1 ?0 ?0 ?0
harry ?0 ?0 ?0 ?1 ?0 ?0
harry ?0 ?0 ?0 ?0 ?1 ?0
harry ?0 ?0 ?0 ?0 ?0 ?1

and make it like this? (that is, add together rows that have the same name?)

jim ? ?1 1 1 0 0 0
bob ? 1 0 1 0 0 0
harry 0 0 1 1 1 1

here's the code I started with, if it helps

library (dummies)
a <- c(1,1,1,2,2,3,3,3,3)
b<- c("A","B","C","A","C","C","D","E","F")
name<- c("jim", "jim", "jim", "bob", "bob", "harry", "harry", "harry", "harry")
MyMat <- cbind (a, b)
rownames (MyMat) <- name
dum.mat.temp <- dummy ("b", MyMat)
? ? ? #dum.mat.temp <-cbind (name, dum.mat.temp) # if you want names
as a column
dum.mat.temp

Many thanks in advance!
--Sarah

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Adding matrix rows that have the same name?

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