[R] Suppressing observation numbers

[Prof Brian Ripley]

On Thu, 3 Mar 2005, Nam-Ky Nguyen wrote:

> Dear R gurus,
>
> Below is a part of the R output. Please consider the two lines:
>> data
>> model.matrix(m1)
>
> Is there a way of suppressing the observation numbers 1, 2, ...27 in the
> output (I don't want these number to appear in the output)?

Actually, these are the row names of a data frame, and the answer is yes.
(Note: I _have_ answered your question!)

If you meant to ask how to do it, here is a hint

library(MASS); write.matrix(hills)

>
> Regards,
> NKN
>
>> # Orthogonal blocking
>> data=read.table("cut.txt",header=T)
>> attach(data)
>> data
>   b x1 x2 x3
> 1  1 -1 -1  0
> 2  1 -1  0  1
> 3  1 -1  1 -1
> 4  1  0 -1  0
> 5  1  0  0  1
> 6  1  0  1 -1
> 7  1  1 -1 -1
> 8  1  1  0  0
> 9  1  1  1  1
> 10 2 -1 -1 -1
> 11 2 -1  0  0
> 12 2 -1  1  1
> 13 2  0 -1  1
> 14 2  0  0 -1
> 15 2  0  1  0
> 16 2  1 -1  0
> 17 2  1  0  1
> 18 2  1  1 -1
> 19 3 -1 -1  1
> 20 3 -1  0 -1
> 21 3 -1  1  0
> 22 3  0 -1 -1
> 23 3  0  0  0
> 24 3  0  1  1
> 25 3  1 -1  1
> 26 3  1  0 -1
> 27 3  1  1  0
>> b=factor(b)
>> y=rnorm(27)
>> x4=x1*x2
>> x5=x1*x3
>> x6=x2*x3
>> x7=x1*x1
>> x8=x2*x2
>> x9=x3*x3
>> options(contrasts=c("contr.sum","contr.poly"))
>> m1=lm(y~b+x1+x2+x3+x4+x5+x6+x7+x8+x9)
>> model.matrix(m1)
>   (Intercept) b1 b2 x1 x2 x3 x4 x5 x6 x7 x8 x9
> 1            1  1  0 -1 -1  0  1  0  0  1  1  0
> 2            1  1  0 -1  0  1  0 -1  0  1  0  1
> 3            1  1  0 -1  1 -1 -1  1 -1  1  1  1
> 4            1  1  0  0 -1  0  0  0  0  0  1  0
> 5            1  1  0  0  0  1  0  0  0  0  0  1
> 6            1  1  0  0  1 -1  0  0 -1  0  1  1
> 7            1  1  0  1 -1 -1 -1 -1  1  1  1  1
> 8            1  1  0  1  0  0  0  0  0  1  0  0
> 9            1  1  0  1  1  1  1  1  1  1  1  1
> 10           1  0  1 -1 -1 -1  1  1  1  1  1  1
> 11           1  0  1 -1  0  0  0  0  0  1  0  0
> 12           1  0  1 -1  1  1 -1 -1  1  1  1  1
> 13           1  0  1  0 -1  1  0  0 -1  0  1  1
> 14           1  0  1  0  0 -1  0  0  0  0  0  1
> 15           1  0  1  0  1  0  0  0  0  0  1  0
> 16           1  0  1  1 -1  0 -1  0  0  1  1  0
> 17           1  0  1  1  0  1  0  1  0  1  0  1
> 18           1  0  1  1  1 -1  1 -1 -1  1  1  1
> 19           1 -1 -1 -1 -1  1  1 -1 -1  1  1  1
> 20           1 -1 -1 -1  0 -1  0  1  0  1  0  1
> 21           1 -1 -1 -1  1  0 -1  0  0  1  1  0
> 22           1 -1 -1  0 -1 -1  0  0  1  0  1  1
> 23           1 -1 -1  0  0  0  0  0  0  0  0  0
> 24           1 -1 -1  0  1  1  0  0  1  0  1  1
> 25           1 -1 -1  1 -1  1 -1  1 -1  1  1  1
> 26           1 -1 -1  1  0 -1  0 -1  0  1  0  1
> 27           1 -1 -1  1  1  0  1  0  0  1  1  0
> attr(,"assign")
> [1]  0  1  1  2  3  4  5  6  7  8  9 10
> attr(,"contrasts")
> attr(,"contrasts")$b
> [1] "contr.sum"
>
>
>
> --
> Nam-Ky Nguyen, Senior Lecturer
> School of Mathematics, Statistics and Computer Science
> University of New England, Armidale NSW 2351 Australia
> nkn at turing.une.edu.au              Tel: +612 6773 2763
> http://turing.une.edu.au/~nkn      Fax: +612 6773 3312
>
> Please convert Word files to PDF files before sending them to me.
> See http://www.gnu.org/philosophy/no-word-attachments.html
>
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-- 
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