[R] Plotting Hints - how to add minor tics on axes

[Gavin Simpson]

On Wed, 2009-08-12 at 11:51 -0700, Jason Rupert wrote:
> Using the standard plotting routine in R, i.e. no special packages, is
> there a way to add in minor tics to the axes?  
> 
> Also, is there a way to make sure the major axes labels are at the
> origin?  When I'm looking at a plot, the major axes labels are
> present, but it looks like they start a bit away from the origin on
> the plot.  
> 
> Thanks again for any info and feedback.

This combines both aspects:


## read ?par and parameters xaxs and yaxs
plot(1:10, xaxs = "i", yaxs = "i")
## notice the above means that the point at 1,1 is obscured

## now add a second axis to the bottom (side 1) with ticks at the 
## specified locations, and shorter tick marks.
## we also suppress the tick labels.
axis(side = 1, at = seq(0, 10, by = 0.1),
     labels = FALSE, tcl = -0.2)

See ?axis for more details on that one.

HTH

G

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