Re: [Rd] dynamic creation of matrix objects (PR#7136)

From: Cliff Behrens <cliff_at_research.telcordia.com>
Date: Wed 28 Jul 2004 - 06:06:54 EST

Thanks to all of you for your suggestion to use "assign" instead.

Cliff Behrens

Pedro Pereira Rodrigues wrote:

>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
>> >
>>
>>______________________________________________
>>R-devel@stat.math.ethz.ch mailing list
>>https://www.stat.math.ethz.ch/mailman/listinfo/r-devel
>>
>>

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https://www.stat.math.ethz.ch/mailman/listinfo/r-devel Received on Wed Jul 28 06:11:04 2004

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