[R] cbind question

[Prof Brian Ripley]

On Sat, 27 Mar 2004, Han, Hillary wrote:

> Thanks very much. I used c, and got the two lists merged fine. I would like to write the results into a file. So used
> 
> > write.table(try, file = "try.txt")
> Error in cbind(...) : cannot create a matrix from these types
> 
> Got into the same cbind error... Any suggestions? Thanks in advance.

You don't have a table!  Use write?  (I don't know what is in your lists, 
but they look like single-element vectors.)

> 
> code:
> > > class(ll)
> > [1] "list"
> > > class(sym)
> > [1] "list"
> > > dim(sym)
> > [1] 508   1
> > > dim(ll)
> > [1] 508   1
> > try <- c(sym[1:5], ll[1:5])
> > dim(try)
> NULL
> > dim(try)<- c(5, 2)
> > try
>      [,1]      [,2] 
> [1,] "Slc40a1" 53945
> [2,] "Rassf5"  54354
> [3,] "Igfbp4"  16010
> [4,] "Hmox1"   15368
> [5,] "Cxcr4"   12767
> > write.table(try, file = "try.txt")
> Error in cbind(...) : cannot create a matrix from these types
> 
> 
> 
> -----Original Message-----
> From:	Prof Brian Ripley [mailto:ripley at stats.ox.ac.uk]
> Sent:	Sat 3/27/2004 3:30 PM
> To:	Han, Hillary
> Cc:	r-help at stat.math.ethz.ch
> Subject:	Re: [R] cbind question
> cbind on vectors/matrices which are not atomic is unsupported: we had a
> bug report on that within the last 24 hours (but it seems to be
> intentional).
> 
> You can just concatenate the lists and add a suitable dimension:
> 
> res <- c(ll, sym)
> dim(res) <- c(508,2)
> 
> if I understand your intentions.
> 
> I think.  However, *why* do you want to do this?  A list of lists would 
> seem to make more sense, and can be indexed in a similar way.
> 
> 
> On Sat, 27 Mar 2004, Han, Hillary wrote:
> 
> > Just wonder if there is any suggestions in how to get around this cbind
> > error. I created two character lists with identical length. First tried
> 
> What is a `character list'?
> 
> > combine the lists together with cbind, then convert the lists to matrix,
> > and tried again. Both faied. Any fix to merge the two lists/matrices?
> 
> Merge?  That's what c() does.
> 
> > ll<- multiget(ftID, hgu95av2LOCUSID)
> > > class(ll)
> > [1] "list"
> > > sym <- multiget(ftID, hgu95av2SYMBOL)
> > > class(sym)
> > [1] "list"
> > > cbind(sym, ll)
> > Error in cbind(...) : cannot create a matrix from these types
> > > sym <- as.matrix(multiget(ftID, hgu95av2SYMBOL))
> > > ll<- as.matrix(multiget(ftID, hgu95av2LOCUSID))
> > > dim(sym)
> > [1] 508   1
> > > dim(ll)
> > [1] 508   1
> > > class(sym)
> > [1] "matrix"
> > > class(ll)
> > [1] "matrix"
> > > cbind(sym,ll)
> > Error in cbind(...) : cannot create a matrix from these types
> 
> 

-- 
Brian D. Ripley,                  ripley at stats.ox.ac.uk
Professor of Applied Statistics,  http://www.stats.ox.ac.uk/~ripley/
University of Oxford,             Tel:  +44 1865 272861 (self)
1 South Parks Road,                     +44 1865 272866 (PA)
Oxford OX1 3TG, UK                Fax:  +44 1865 272595