Suppressing observation numbers

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

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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