[R] keep dimension of a sub matrix

Eric Lecoutre lecoutre at stat.ucl.ac.be
Thu Nov 4 12:41:57 CET 2004


 > 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 ";" ...


At 12:06 4/11/2004, JC Vaugeois wrote:
>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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Eric Lecoutre
UCL /  Institut de Statistique
Voie du Roman Pays, 20
1348 Louvain-la-Neuve

tel: (+32)(0)10473050
lecoutre at stat.ucl.ac.be

If the statistics are boring, then you've got the wrong numbers. -Edward 

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