R help - Nov 2005 - Orientation of tickmarks labels in boxplot/plot

Hi,

I have been trying draw tickmark labels along
the y - axis perpendicular to the y axis while
labels along the x - axis parallel to x axis
while making box plot.

Here is my test dataset.

 TData
   ID Ratio
1   0 7.075
2   0 7.414
3   0 7.403
4   0 7.168
5   0 6.820
6   0 7.294
7   0 7.238
8   0 7.938
9   1 7.708
10  1 8.691
11  1 8.714
12  1 8.066
13  1 8.949
14  1 8.590
15  1 8.714
16  1 8.601

 boxplot(Ratio ~ ID, data=TData)

makes box plot with tickmark labels parallel to the y - axis.
So I try 

boxplot(Ratio ~ ID, data=TData, axes=FALSE)
par(las=0)
axis(1)
and I get x - axis ranging from 0.5 to 2.5 (why?) and 
boxes at 1 and 2.
par(las=2)
axis(2)
box()
So, if I set tickmark labels parallel to y - axis
somehow the x - axis range is not what I expect even
if I use xlim = c(0.0, 3.0)
 in boxplot(Ratio ~ Id, data=TData, axes=FALSE, xlim=c(0.0, 3.0))
 par(las=0)
 axis(1)

Plots are in the attachments in pdf format.

I appreciate any tips.

I am using R 2.2.0 (2005-10-06) on FC4.

Michal







-------------- next part --------------
A non-text attachment was scrubbed...
Name: RPlot1.pdf
Type: application/pdf
Size: 3578 bytes
Desc: not available
Url :
https://stat.ethz.ch/pipermail/r-help/attachments/20051102/db2c5449/RPlot1.pdf
-------------- next part --------------
A non-text attachment was scrubbed...
Name: RPlot2.pdf
Type: application/pdf
Size: 2731 bytes
Desc: not available
Url :
https://stat.ethz.ch/pipermail/r-help/attachments/20051102/db2c5449/RPlot2.pdf

Michal:
> and I get x - axis ranging from 0.5 to 2.5 (why?) and 
> boxes at 1 and 2.
See the "at" argument of ?bxp and note what it says there regarding
the
default. Read the docs more carefully -- ?boxplot has the link to bxp().

Bert Gunter
Genentech

On Wed, 2005-11-02 at 16:06 -0600, Michal Lijowski
wrote:
> Hi,
> 
> I have been trying draw tickmark labels along
> the y - axis perpendicular to the y axis while
> labels along the x - axis parallel to x axis
> while making box plot.
> 
> Here is my test dataset.
> 
>  TData
>    ID Ratio
> 1   0 7.075
> 2   0 7.414
> 3   0 7.403
> 4   0 7.168
> 5   0 6.820
> 6   0 7.294
> 7   0 7.238
> 8   0 7.938
> 9   1 7.708
> 10  1 8.691
> 11  1 8.714
> 12  1 8.066
> 13  1 8.949
> 14  1 8.590
> 15  1 8.714
> 16  1 8.601
> 
>  boxplot(Ratio ~ ID, data=TData)
> 
> makes box plot with tickmark labels parallel to the y - axis.
> So I try 
> 
> boxplot(Ratio ~ ID, data=TData, axes=FALSE)
> par(las=0)
> axis(1)
> and I get x - axis ranging from 0.5 to 2.5 (why?) and 
> boxes at 1 and 2.
> par(las=2)
> axis(2)
> box()
> So, if I set tickmark labels parallel to y - axis
> somehow the x - axis range is not what I expect even
> if I use xlim = c(0.0, 3.0)
>  in boxplot(Ratio ~ Id, data=TData, axes=FALSE, xlim=c(0.0, 3.0))
>  par(las=0)
>  axis(1)
> 
> Plots are in the attachments in pdf format.
> 
> I appreciate any tips.
> 
> I am using R 2.2.0 (2005-10-06) on FC4.
> 
> Michal
I suspect that you want this:

  boxplot(Ratio ~ ID, data=TData, las = 1)

so that the x and y axis labels are horizontal. See ?par and review the
options for 'las'. '1' is for axis tick mark labels to be
horizontal.

The x axis (horizontal axis if the boxes are vertical, the vertical axis
if the boxes are horizontal) is set by default to the number of boxes
(groups) +/- 0.5.  'xlim' is ignored in both cases.

The boxes themselves are placed at integer values from 1:N, where N is
the number of groups.

There is the 'at' argument and there is an example of its use
in ?boxplot. You can also search the archives for posts where variations
on the use of 'at' have been posted (recently, in fact...)

The actual plotting of the boxplots is done by bxp(), so review the help
for that function as well.

HTH,

Marc Schwartz