Printing to screen a matrix or data.frame in one chunk (not splitting columns)

Hello,

I saw this nice trick I want to replicate but I lost the source and  
I hope
one of you can point me to the solution.  My problem is that I don't  
know
the correct words to query this.

When I print to screen a matrix or data.frame the columns are split  
and
printed below the previous ones; even though I have plenty of screen  
left.

E.g.,

my_matrix = matrix(runif(30),nrow=3,ncol=10)
my_matrix

         [,1]      [,2]      [,3]       [,4]      [,5]      [,6]
[,7]
[1,] 0.4979305 0.1155717 0.4484069 0.29986049 0.5427566 0.4324351
0.269171456
[2,] 0.8405987 0.3605237 0.6615507 0.75305248 0.8569482 0.3401004
0.192526423
[3,] 0.5608779 0.3953941 0.9995035 0.03141064 0.7985053 0.4903582
0.000490054
         [,8]      [,9]      [,10]
[1,] 0.1402751 0.2852381 0.98816751
[2,] 0.8337806 0.7322920 0.17505541
[3,] 0.5414113 0.4668012 0.04420137

So there is a way to resize the space for printing so that  
everything in
printed in one chunk.

Thanks in advance,
Adrian

See ?options and take note of 'width' which defaults to 80. Increase  
that value to a number that suits your requirements.

HTH,

Marc Schwartz

"AC" == Adri?n Cort?s <adrcort at gmail.com>
    on Fri, 15 May 2009 08:58:04 -0700 writes:

AC> Hello,
    AC> I saw this nice trick I want to replicate but I lost the source and I hope
    AC> one of you can point me to the solution.  My problem is that I don't know
    AC> the correct words to query this.

    AC> When I print to screen a matrix or data.frame the columns are split and
    AC> printed below the previous ones; even though I have plenty of screen left.

    AC> E.g.,

    >> my_matrix = matrix(runif(30),nrow=3,ncol=10)
    >> my_matrix
    AC> [,1]      [,2]      [,3]       [,4]      [,5]      [,6]
    AC> [,7]
    AC> [1,] 0.4979305 0.1155717 0.4484069 0.29986049 0.5427566 0.4324351
    AC> 0.269171456
    AC> [2,] 0.8405987 0.3605237 0.6615507 0.75305248 0.8569482 0.3401004
    AC> 0.192526423
    AC> [3,] 0.5608779 0.3953941 0.9995035 0.03141064 0.7985053 0.4903582
    AC> 0.000490054
    AC> [,8]      [,9]      [,10]
    AC> [1,] 0.1402751 0.2852381 0.98816751
    AC> [2,] 0.8337806 0.7322920 0.17505541
    AC> [3,] 0.5414113 0.4668012 0.04420137

    AC> So there is a way to resize the space for printing so that everything in
    AC> printed in one chunk.

options(width = 100) # or whatever.

---

For ESS users, 
this option is set to the "correct" value, when R is started.
If later, the emacs window is resized,
you can automatically set the width to the current buffer
("window") size, by

   M-x ess-execute-screen-options

or, for everyone here who has

  (add-hook 'ess-mode-hook	  'ess-add-MM-keys)
  (add-hook 'inferior-ess-mode-hook 'ess-add-MM-keys)

in their ~/.emacs equivalent, it's a simple  
"C-c w" ('w' for 'width') to adapt the R option to the emacs
window size.

Martin Maechler, 
ETH Zurich