R help - May 2002 - graphics question

Hi

after browsing the documentation and web, I'm completely lost as how to 
create the graph I describe below (as best as I can).

I've got 3 pairs of average response times: (390,396), (416, 421), 
(406,415). Each of these pairs represents a level of a certain factor 
(let's call it 'loc'), namely (in the same order), levels
"c", "nc" and
"ni". Within a pair, the first value belongs to the level
"sc" of the
factor 'cat'; the second value belongs to the level "oc".

The graph I'm looking for has on the y-axis the RT values (in ms), so this 
should range from 350 - 450. On the x-axis I want two ticks for each level 
(sc and oc) of the 'cat' factor. In the plot, three lines should be 
displayed, for each level of the factor 'loc', pref. including a legend.

How do I do this???
Please send a CC to my address (p.lemmens at nici.kun.nl), as I'm not yet 
subscribed to the list.

thank you for your help!
Paul


-- 


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On Wed, 15 May 2002, Paul Lemmens wrote:
> The graph I'm looking for has on the y-axis the RT values (in ms), so
this
> should range from 350 - 450. On the x-axis I want two ticks for each level
> (sc and oc) of the 'cat' factor. In the plot, three lines should be
> displayed, for each level of the factor 'loc', pref. including a
legend.
>
> How do I do this???
Does example(interaction.plot) look like the sort of thing you want?

	-thomas

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On 05/15/02 17:30, Paul Lemmens wrote:
>Hi
>
>after browsing the documentation and web, I'm completely lost as how to 
>create the graph I describe below (as best as I can).
>
>I've got 3 pairs of average response times: (390,396), (416, 421), 
>(406,415). Each of these pairs represents a level of a certain factor 
>(let's call it 'loc'), namely (in the same order), levels
"c", "nc" and
>"ni". Within a pair, the first value belongs to the level
"sc" of the
>factor 'cat'; the second value belongs to the level "oc".
>
>The graph I'm looking for has on the y-axis the RT values (in ms), so
this
>should range from 350 - 450. On the x-axis I want two ticks for each level 
>(sc and oc) of the 'cat' factor. In the plot, three lines should be 
>displayed, for each level of the factor 'loc', pref. including a
legend.
I'm not going to solve the whole thing, but I think what you want
is matplot(m1,typ="l"), where m1 is a matrix made from your data
above.  (I think it would go like

390 396
416 421
406 415

but I might have it transposed.  I always ending up trying t(m1)
because I never remember which way it goes so I guess rather than
reading the help page.)  You might be able to get proper labels
by using colnames(x) and rownames(x).  After the plot, you can
use legend() to add a legend.

Jon

-- 
Jonathan Baron, Professor of Psychology, University of Pennsylvania
Home page: http://www.sas.upenn.edu/~baron
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I'm learning R and having some trouble clearing a screen. I'm 
using Version 1.5.0 and have encountered the same problem under Linux (RH7.2) 
and Windows (2K). For example:
> split.screen(c(2,2))
> plot(1:10)
> screen(2)
> plot(10:1)
> erase.screen(1)
> screen(1)
> plot(10:1)
What should I be expecting to happen? At the moment, it overlays the plots on 
screen 1. I've run through the example in the documentation under screen and
it also seems to overlay plots. I've also tried setting new=TRUE when
setting
the screen, but that hasn't helped. What I would like to do (and was 
expecting) was that a new plot would clear that particular screen (e.g. 
screen 1 in the example above) instead of overlaying it.  

Most of the other things that I've tried have worked nicely. Any help would 
be appreciated. Perhaps there is a better text/reference for this specific 
question?

Sincerely,

Peter  



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