The following, which was recently discussions on the rcom-l list, is a situation where coercing x1mat to a vector using as.vector results in an object that is.vector says is not a vector:
R> x1mat<-matrix(list(1,1.1,1+1i,"a",NA,NaN), 3, 2)
R> is.vector(as.vector(x1mat))
[1] FALSE
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