just use
matrix(1,4,4)[i1:i2,j1:j2, drop=FALSE]
Best, Dimitris
---- Dimitris Rizopoulos Ph.D. Student Biostatistical Centre School of Public Health Catholic University of Leuven
Address: Kapucijnenvoer 35, Leuven, Belgium Tel: +32/16/396887 Fax: +32/16/337015 Web: http://www.med.kuleuven.ac.be/biostat/ http://www.student.kuleuven.ac.be/~m0390867/dimitris.htm
----- Original Message ----- From: "JC Vaugeois" <[EMAIL PROTECTED]>
To: <[EMAIL PROTECTED]>
Sent: Thursday, November 04, 2004 12:06 PM
Subject: [R] keep dimension of a sub matrix
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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