Thanks Henrique and Marc for your reply, both worked.
 
However I need one more suggestion on from list to matrix
 
dat <- vector("list", 3)
dat[[1]] <- rnorm(5)
dat[[2]] <- rnorm(15)
dat[[3]] <- rnorm(3)
> dat
[[1]]
[1] 0.7615421 0.4151374 0.6534402 1.5999338 1.4131837
[[2]]
 [1]  0.7364765  2.0786904 -1.1087768  1.5091391 -0.1448301  1.6015788  1.8039138  1.1194863  1.4907951  0.5324749
[11]  0.6792318 -0.8328359 -1.8009706 -0.8523432  0.5314461
[[3]]
[1] -0.4350899 -0.2610924 -0.6489858

Now I want to convert "dat" to a matrix. I tried following:
 
> Reduce("cbind", dat)
           init                      
 [1,] 0.7615421  0.7364765 -0.4350899
 [2,] 0.4151374  2.0786904 -0.2610924
 [3,] 0.6534402 -1.1087768 -0.6489858
 [4,] 1.5999338  1.5091391 -0.4350899
 [5,] 1.4131837 -0.1448301 -0.2610924
 [6,] 0.7615421  1.6015788 -0.6489858
 [7,] 0.4151374  1.8039138 -0.4350899
 [8,] 0.6534402  1.1194863 -0.2610924
 [9,] 1.5999338  1.4907951 -0.6489858
[10,] 1.4131837  0.5324749 -0.4350899
[11,] 0.7615421  0.6792318 -0.2610924
[12,] 0.4151374 -0.8328359 -0.6489858
[13,] 0.6534402 -1.8009706 -0.4350899
[14,] 1.5999338 -0.8523432 -0.2610924
[15,] 1.4131837  0.5314461 -0.6489858

 
Here you see values of vector with smaller length is getting repeated. Instead of repetition, I would like to fill those with "NA" (or possibly some predefined fixed value)
 
Would you please suggest me how to do that?
 
Thanks,


--- On Fri, 3/9/10, Henrique Dallazuanna <wwwhsd@gmail.com> wrote:


From: Henrique Dallazuanna <wwwhsd@gmail.com>
Subject: Re: [R] Matrix to list
To: "Ron Michael" <ron_michael70@yahoo.com>
Cc: r-help@stat.math.ethz.ch
Date: Friday, 3 September, 2010, 8:07 PM


Try this:

unclass(as.data.frame(mat))



On Fri, Sep 3, 2010 at 9:48 AM, Ron Michael <ron_michael70@yahoo.com> wrote:

Dear all, suppose I have following matrix:
 
> mat <- matrix(rnorm(25), 5)
>
> mat
            [,1]       [,2]        [,3]       [,4]       [,5]
[1,]  0.97056228 -1.3278509 -0.73511792  2.1650629 -0.4411997
[2,]  0.58613700 -0.2559899 -1.18334248 -1.4990907  1.8138846
[3,] -1.03333313  2.0227887  0.89622681  0.6483973 -1.5523283
[4,]  0.38968833  0.2490004 -0.02301061 -0.2705150 -0.9237268
[5,]  0.03306289 -0.4022751 -0.44404905 -1.6810542 -0.1016683

Now from "mat" I would like to create a "list" object where i-th column of "mat" will represent i-th element of that list object.
 
I am looking for some way to avoid for loop. It will be really helpful if somebody points me on that.
 
Thanks,


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