[R] How do I plot geoms in parallel in ggplot

[Charlotte Wickham]

You'll have to reshape your data so that each row corresponds to a
single subject, time and measurement.  I.e. something like:
Subj        Time         variable         value
1        1        Height        9
1        1        Weight       4
1        1        WBC          4
1        1        Plt            150
1        2        Height       10
1        2        Weight       5
....

This is easy enough with reshape.  Assuming your data is in data.frame df:
df.m <- melt(df, id.vars = c("Subj", "Time"))

Then plot:
qplot(Time, value, data = df, geom = "line")  + facet_grid(Subj ~ variable)


Charlotte

On Thu, May 6, 2010 at 11:06 AM, George Chen <glchen at stanford.edu> wrote:
>
> Hello,
>
> I am new to ggplot.  Please forgive my ignorance!
>
> I have patient data such that each individual is a row and then the attributes are in columns.  So for example:
>
> Subj        Time        Height        Weight        WBC        Plt
> 1        1        9        4        4        150
> 1        2        10        5        6        200
> 1        3        11        6        5        250
> 1        4        12        7        3        200
> 2        1        4        2        7        300
> 2        2        5        4        8        450
> 2        3        6        6        6        300
> 2        4        8        8        5        200
> 3        1        6        6        4        455
> 3        2        8        8        5        344
> 3        3        9        9        6        544
> 3        4        10        10        3        213
>
> I would like to show the data as a time course for height , weight, WBC, and plt for each patient but in parallel and ultimately as a matrix of time courses for all the subjects with each patient a row and the time course graph for height weight WBC plt as individual columns.
>
> So something like this
> Subj 1   Height time course(TC)   Weight TC    WBC TC    Plt TC
> Subj 2   Height time course(TC)   Weight TC    WBC TC    Plt TC
> Subj 3   Height time course(TC)   Weight TC    WBC TC    Plt TC
>
> Ultimately I would like to be able to sort and reorder the order of the subject rows (so each row would become like a facet).
> Could somebody give me a hint as to how or where to start looking to figure this out?  I suspect it involves a layer for each time course, but how does one move the time course for say weight over so that it does not overly that for height?
>
> Thanks in advance!
>
> George
>
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