R help - Oct 2010 - (senza oggetto)

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Hi,

Try this:
plot(seq(0,1.5,0.1), yaxt="n")
axis(2, at=seq(0.00,1.50, 0.15))

To understand read ?par (especially the yaxt argument in that case, but 
I guess you need to know more about that) and ?axis

HTH,
Ivan

Le 10/11/2010 14:07, Barbara.Rogo at uniroma1.it a ?crit
:
> I have the y-axe in a grafich that has as extreme limit 0.00 and 1.50.
"plot" gives me the interval 0.0, 0.5,1.0,1.5 but I want:
> 0.00,0.15,0.30 and so on with 2 decimals. How can I do? Thanks
> 	[[alternative HTML version deleted]]
>
> ______________________________________________
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> PLEASE do read the posting guide
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>
-- 
Ivan CALANDRA
PhD Student
University of Hamburg
Biozentrum Grindel und Zoologisches Museum
Abt. S?ugetiere
Martin-Luther-King-Platz 3
D-20146 Hamburg, GERMANY
+49(0)40 42838 6231
ivan.calandra at uni-hamburg.de

**********
http://www.for771.uni-bonn.de
http://webapp5.rrz.uni-hamburg.de/mammals/eng/mitarbeiter.php

On 11-Oct-10 12:07:43, Barbara.Rogo at uniroma1.it
wrote:
> 
> I have the y-axe in a grafich that has as extreme limit 0.00 and 1.50.
> "plot" gives me the interval 0.0, 0.5,1.0,1.5 but I want:
> 0.00,0.15,0.30 and so on with 2 decimals. How can I do? Thanks
>       [[alternative HTML version deleted]]
> ______________________________________________
The key to this is the plot() parameter yaxp [see below].

So, for instance,

x <- (0:5)
y <- 1.5*(x^2)/(5^2) ## y-values range from 0 to 1.5
plot(x, y, ylim=c(0,1.5), yaxp=c(0,1.5,10))

## And compare with:
plot(x, y, ylim=c(0,1.5))


The explanation of 'yaxp' (and its x-friend xaxp) can be
found is '?par'. The full details are under 'xaxp':

'xaxp' A vector of the form 'c(x1, x2, n)' giving the
       coordinates of the extreme tick marks and the
       number of intervals between tick-marks when
       'par("xlog")' is false. [...]

As explained under 'yaxp', this is constructed in the
same way as 'xaxp.

So you have y ranging from 0 to 1.5 by steps of 0.15,
hence a total of 10 intervals, therefore

  yaxp = c(0,1.5,10)

It is unfortunate that the documentation for the large
number of parameters and features for graphics, even
for the basic plot() function (which will be every
beginner's starting point) is fragmented over many
different documentation entries.

If you start with '?plot', not yet knowing where you
should be looking, it could take you several tries in
different places before you find what you want!

Hoping this helps,
Ted.

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E-Mail: (Ted Harding) <ted.harding at wlandres.net>
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Date: 11-Oct-10                                       Time: 13:51:24
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