[R] function for special matrix design

[Wayne.W.Jones at shell.com]

Lookup: 

?diag
?upper.tri
?lower.tri

Example: 

my.mat<-matrix(1:16,ncol=4)
my.mat
my.mat[upper.tri(my.mat)]<-3
my.mat


-----Original Message-----
From: r-help-bounces at r-project.org
[mailto:r-help-bounces at r-project.org]On Behalf Of kevinchang
Sent: 01 October 2007 17:37
To: r-help at r-project.org
Subject: [R] function for special matrix design



Hi All,

I am trying to make a matrix with a particular value for all the elements
above and including diagonal and another particular value for all the
elements below diagonal. Obviously , Matrix function in Matrix package does
not work since it only allow filling by either row or column. So I am
wondering if there is a built-in function allowing me to do this ? please
help. Thanks



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