See
> help("[")which informs you about the additional argument "drop":
> ret <-matrix(1,4,4)[i1:i2,j1:j2,drop=FALSE] ;
BTW, you do not need to end lines of code with a ";" ...
Eric
At 12:06 4/11/2004, JC Vaugeois wrote:
Hi, is there any way to keep a sub matrix dimension?
exemple : i1<-1; i2<-1 j1<-2; j2<-3; ret <-matrix(1,4,4)[i1:i2,j1:j2] ;
dim(ret) is NULL because the submatrix single col or single row is coerce to a vector automaticaly.
How can i bypass this cast : submatrix->vector ???????
Thank you.
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