[R] xaxp and yaxp

[Arne Mueller]

Hello,

thanks for the reply, the axis command does exacly what I wanted. 
Although I think it's a bit more complex than it realy has to be (?). I 
mean why is there a 'xaxp' attribute if I have to calls the axis command 
anyway?

		regards,

		Arne

Uwe Ligges wrote:
> Arne Mueller wrote:
> 
>>Hello,
>>
>>I'm new to R, and I'm trying to set the number of tickmarks for a plot
>>using xaxp, but R seems to ignore this setting completely. Maybe you've
>>an idea what I'm doing wrong. I'm using R 1.4.1, and here's hat I'm
>>doing:
>>
>>
>>>d[,'seq']
>>>
>> [1] 28913 16323 13922  6237  4257  3881  4100  3781  2694  2064  1769
>>1550
>>[13]  1539   480
>>
>>
>>>d[,'scop.dup.rate']
>>>
>> [1] 97.7 95.3 95.3 88.5 84.6 84.6 84.7 82.8 71.5 74.9 74.9 71.2 67.8
>>54.9
>>
>>
>>>plot(d[,'seq'], d[,'scop.dup.rate'], col="red", pch=22, bg='red', cex=1.5, xlim = c(0,30000), ylim=c(20,100))
>>>
>>tick marks are placed at 0,5000, ... 30000 for the xaxis.
>>
>>now I'd like to have more tickmarks
>>
>>
>>>plot(d[,'seq'], d[,'scop.dup.rate'], col="red", pch=22, bg='red', cex=1.5, xlim = c(0,30000), ylim=c(20,100), xaxp=c(0,30000,13))
>>>
>>tickmarks are set the same way as above.
>>
>>Also par(xaxp=c(0,30000,13)) does not change anything ... :-(
>>
>>I'd like to have 13 tick marks on the x-axis including the extreme ones
>>(0 and 30000).
>>
>>I'm not sure whether I realy understand what xaxp is doing, so I thought
>>it may need the interval:
>>
>>par(xaxp=c(0,30000,2500))
>>
>>hm, but this doesn't change anything either :-(
>>
> 
> 
> In your case you should set the tickmarks manually using axis(), e.g.:
> 
>  plot(..., xaxt="n")
>  axis(1, at=seq(0, 30000, length=13)
> 
> If you don't specify the loactions manually the function pretty() will
> be used in principle.
> 
> 
> Uwe Ligges
> 
> 
> 



-- 
Arne Mueller
Biomolecular Modelling Laboratory
Imperial Cancer Research Fund
44 Lincoln's Inn Fields
London WC2A 3PX, U.K.
phone : +44-(0)207 2693405      | fax :+44-(0)207-269-3534
email : a.mueller at icrf.icnet.uk | http://www.bmm.icnet.uk

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