dynamic creation of matrix objects (PR#7136)

You should consider using

 

eval(parse(text=paste(tName,"Mat <-aMat",sep="")))
   

instead.

If you try only 

 

parse(text=paste(tName,"Mat <-",aMat,sep=""))
   

you see where the problem is:

expression(thatMat <- 1, thatMat <- 2, thatMat <- 3, thatMat <- 4,
   thatMat <- 5, thatMat <- 6, thatMat <- 7, thatMat <- 8)


Good Luck.


On Tue, 2004-07-27 at 20:47, cliff@research.telcordia.com wrote:
 

I am trying to assign the values in a matrix to an object whose name is 
created dynamically, i.e., using eval-parse-text-paste sequence.  It 
seems that only the very last value in the matrix is assigned to the new 
object.  I have included an example below where I create a matrix object 
called "aMat".  I can assign the contents of aMat to another object 
called "thisMat."  However, when I attempt to make a similar assignment 
to a new object called "thatMat", only the last value is returned, when 
queried.  Does anybody know whether this is a bug...or am I doing 
something wrong?

Cliff Behrens

aMat<- matrix(c(1,2,3,4,5,6,7,8),ncol=2)
aMat

    [,1] [,2]
[1,]    1    5
[2,]    2    6
[3,]    3    7
[4,]    4    8

thisMat<- aMat
thisMat

    [,1] [,2]
[1,]    1    5
[2,]    2    6
[3,]    3    7
[4,]    4    8

tName<-"that"
eval(parse(text=paste(tName,"Mat <-",aMat,sep="")))
thatMat

[1] 8