[R] Converting Matrix into List - problem (urgent)

[Daniel Nordlund]

> -----Original Message-----
> From: r-help-bounces at r-project.org 
> [mailto:r-help-bounces at r-project.org] On Behalf Of Nidhi Kohli
> Sent: Sunday, March 22, 2009 10:41 AM
> To: JiHO
> Cc: R Help
> Subject: Re: [R] Converting Matrix into List - problem (urgent)
> 
> JiHo,
> 
> Thanks for the reply, however i dont think it will help. Okay 
> here is what i will achieve once i get this into a list 
> format. I have another file in the following format:
> 0.63275433157105
> 0.686061949818395
> 0.786426681675948
> 0.954103894997388
> 0.600840965518728
> 0.949194842483848
> 0.972337634302676
> 0.830398896243423
> 0.81455702194944
> 0.530893135233782
> 0.602987287449650
> 0.588278376264498
> 0.843511423328891
> 0.692051859106869
> 0.884920709999278
> 0.748849621042609
> 0.858809254132211
> 0.995953047415242
> 0.690017589717172
> 0.888722610659897
> 
> I need to compute correlation between these two sets. So i'm 
> trying to convert my other file also in the above format so 
> that i can use the function to compute correlation
> 
> Nidhi
> 
> ---- Original message ----
> >Date: Sun, 22 Mar 2009 13:27:32 -0400
> >From: JiHO <jo.lists at gmail.com>  
> >Subject: Re: [R] Converting Matrix into List - problem (urgent)  
> >To: Nidhi Kohli <nidhik at umd.edu>
> >Cc: "R Help" <r-help at stat.math.ethz.ch>
> >
> >On 2009-March-22  , at 13:06 , Nidhi Kohli wrote:
> >
> >> Thank you so much for the quick reply. Let me explain you what I  
> >> want. I have a data file in the following format:
> >>
> >> 0.610251D+00 0.615278D+00 0.583581D+00 0.560295D+00
> >> 0.501325D+00 0.639512D+00 0.701607D+00 0.544963D+00
> >> 0.589746D+00 0.648588D+00 0.608216D+00 0.582599D+00
> >> 0.625204D+00 0.523065D+00 0.627593D+00 0.621433D+00
> >> 0.733730D+00 0.498495D+00 0.748673D+00 0.591025D+00
> >> 0.578333D+00 0.564807D+00 0.652199D+00 0.579333D+00
> >>
> >> I'm reading this file into a variable named congeneric 
> (see my code)  
> >> and now trying to pick up first 20 values and need these 
> 20 values  
> >> in a list format like
> >>
> >> 0.610251D+00 (row 1, col 1)
> >> 0.615278D+00 (row 1, col 2)
> >> 0.583581D+00 (row 1, col 3)
> >> .......
> >> ........
> >>
> >> Can you tell me how can i achieve this? I think i'm pretty 
> close but  
> >> don't know how to remove the Row Name and Col. name from the  
> >> conFirstTwenty list (see my code)
> >
> >Alternatives:
> >
> >congeneric <- scan(textConnection("0.610251 0.615278 
> 0.583581 0.560295
> >0.501325 0.639512 0.701607 0.544963
> >0.589746 0.648588 0.608216 0.582599
> >0.625204 0.523065 0.627593 0.621433
> >0.733730 0.498495 0.748673 0.591025
> >0.578333 0.564807 0.652199 0.579333"), sep=" ")
> ># you would use scan with the filename in which the data is, rather  
> >than the textConnection. That's just for the purpose of the  
> >demonstration here.
> >
> ># possible outputs
> >congeneric[1:20]
> >
> >as.list(congeneric[1:20])
> >
> >for (i in 1:20) {
> >	cat(congeneric[i],"\n")
> >}
> >
> >JiHO
> >---

You really haven't given us enough information.  What stements did you
execute that produced the data and row/column labels shown above?  What does
running str(congeneric) tell you about congeneric?  I don't think you want
your data for the correlation in an R list structure.  You want your data in
vectors, or the columns of a matrix or dataframe.  Given the data in your
file, you could do something like this

#read data into a matrix
m <- as.matrix(read.table("your_data_file",sep=' ', header=FALSE))

#get the 20 values you want
vector1 <- as.vector(t(m))[1:20]

But without knowing the actual structure of your variable congeneric, it is
not possible to tell you how to manipulate it.  Maybe someone else will be
better at guessing.

Dan

Daniel Nordlund
Bothell, WA USA