[R] Lattice plot

[Deepayan Sarkar]

On Wed, Nov 18, 2009 at 4:14 AM, Tim Smith <tim_smith_666 at yahoo.com> wrote:
> Hi,
>
> I was trying to get a graph in lattice with the following data frame (7 rows, 5 cols):
> chr start1 end1 meth positive
> 1   1     10   20  1.5        y
> 2   2     12   18 -0.7        n
> 3   3     22   34  2.0        y
> 4   1     35   70  3.0        y
> 5   1    120  140 -1.3        n
> 6   1    180  190  0.2        y
> 7   2    220  300  0.4        y
> I wanted the panels to be organized by 'chr' - which is ok. Further, I wanted the lines to be discontinuous. For example, in the first row, the x co-ordinate starts with a value of 10 (2nd column) and ends with a value of 20 (3rd column). The corresponding y value for this range of x values is 1.5 (4th column). Similarly, for the same panel (i.e chr=1), the fourth row would have x co-ordinate range from 35 to 70 with a y co-ordinate of 3.



You could do it with

library(latticeExtra)
segplot(meth ~ start1 + end1 | factor(chr), bar, type = "g")

but as Baptiste said, ggplot2 can do conditioning just as well.

-Deepayan


> If it were only one panel, a similar result could be achieved for the data x2:
>> x2
>  chr start1 end1 meth positive
> 1   1     10   20  1.5        y
> 4   1     35   70  3.0        y
> 5   1    120  140 -1.3        n
> 6   1    180  190  0.2        y
>
>
> ## Code courtesy of BAPTISTE AUGUIE
> library(ggplot2)
> ggplot(data=x2) +
>  geom_segment(aes(x=start1, xend=end1, y=meth, yend=meth))
> - Can I get lattice to do a similar graph for the panels?
> thanks!
>
>
>
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