R help - Sep 2010 - change y axis "distance"

Hi

I got a barplot that has values between 0-150 and the y-axis shows the steps
0 50 100 and 150 but I would like to change it to 0 10 20 30... ...130 140
150

Dont really know the word in english so sry about it beeing abit confusing
:)

Thx for your help 
Joel
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On Tue, 2010-09-21 at 03:55 -0700, Joel wrote:
> Hi
> 
> I got a barplot that has values between 0-150 and the y-axis shows the
steps
> 0 50 100 and 150 but I would like to change it to 0 10 20 30... ...130 140
> 150
> 
> Dont really know the word in english so sry about it beeing abit confusing
> :)
> 
> Thx for your help 
> Joel
If you want to draw the ticks at specific locations rather than the ones
R chooses for you, turn off the axes in your plot call and then cook
your own axis using the axis() function.

Here's an example using dummy data:

set.seed(123)
mdat <- rpois(10, 10)
names(mdat) <- LETTERS[1:10]
barplot(mdat, axes = FALSE)
## label at 1, 2, 3 etc not 2, 4, 6, etc
axis(side = 2, at = seq(1, max(mdat), by  = 2))

For you specific axis call, try:

axis(side = 2, at = seq(0, 150, by = 10))

HTH

G
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On 09/21/2010 08:55 PM, Joel wrote:
>
> Hi
>
> I got a barplot that has values between 0-150 and the y-axis shows the
steps
> 0 50 100 and 150 but I would like to change it to 0 10 20 30... ...130 140
> 150
>
Hi Joel,
This is a combination of the "pretty" calculation of axis tick
intervals
and the silent omission of labels that appear to be crowded. You can 
probably get the fifteen labels by adding:

# set the axis labels to all horizontal text
par(las=1)
# add the yaxt argument to plot
plot(...,yaxt="n",...)
# display the axis
axis(2,at=seq(0,150,by=10),labels=seq(0,150,by=10))

If some of the labels are missing, you might have to turn to staxlab in 
the plotrix package or a similar function.

Jim

Thx for all your help!
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