[R] setting the steps for x axis labels on plot

[Gonzalo Garcia-Perate]

Thank you both for your help, axis did the trick very nicely.

On 1 March 2010 11:34, Chuck Cleland <ccleland at optonline.net> wrote:
> On 3/1/2010 6:16 AM, Gonzalo Garcia-Perate wrote:
>> Hello, I'm new to R, I've been working with it for the last 2 weeks. I
>> am plotting some data and not getting the labels on the x axis I am
>> expecting on my plot.
>>
>>
>> my code reads
>>
>> #hours in the day
>> h <- c(0,1,2,3,4,5,6,7,8,9,10,11,12,13,14,15,16,17,18,19,20,21,22,23)
>> #hp is a data frame with a pivot table of 25 columns (label and data for
>> 24 hours)
>> plot(h, as.matrix(hp[1,2:25]), main = hp[1,1], type="l", xlim=c(0,23),
>> ylim=c(0,1800), xlab="hour", ylab="visitor activity")
>>
>>
>> the result you can see here:
>> http://www.flickr.com/photos/gonzillaaa/4397357491/
>>
>> I was hoping the steps on the x axis would be every hour or at least
>> every two hours I am getting unevenly spaced steps (0, 5, 10, 20) instead.
>>
>>
>>
>> apologies if this is too obvious a question, I've looked around on
>> documentation etc. but found no reference to this.
>
>  You can suppress the x axis in the call to plot() and then add it with
> a call to axis().  For, example
>
>
> plot(0:23, runif(24, min=0, max=1800), type="l", xlim=c(0,23),
> ylim=c(0,1800), xlab="hour", ylab="visitor activity", xaxt='n')
>
> axis(side=1, at=0:23, cex.axis=.5)
>
> ?axis
>
>> Many thanks,
>>
>>
>> Gonzalo.
>>
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>
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