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

[Cliff Behrens]

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 at 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
>> >
>>
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>>    
>>

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