I'm trying to apply the function "assign( )" to a subset of a matrix, but it doesn't work...

i.e.

example<-matrix(nrow=5,ncol=5)
assign("example[c(1,3),]",matrix(1:10,nrow=2,ncol=5))

but matrix "example" doesn't change ( get("example[c(1,3),]") is not useful to me)...how can I do this assignment?
Thanks in advance,

                                          Marco
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