[R] Rows assignment

[Yuri Volchik]

Hi to all members,

i encountered a weird problem when trying to assign subset of rows in a
matrix.
Simple example works fine:
z<-matrix(NA,ncol=3,nrow=10)
z[,1]<-1:10
y<-matrix(1:30,ncol=3,nrow=10)
y[,1]<-5:14
z[z[,1]%in%y[,1],2]<-y[y[,1]%in%z[,1],2]
z
z[z[,1]%in%y[,1],]<-y[y[,1]%in%z[,1],]
z


When i try it on a bigger matrix it works fine when i try to assign 1
element, but converts original matrix to a list when trying to assign 2 or 3
columns for example.
What can be a problem, as it seems that matrices are both numbers only?


Thanks
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