changing order of x values in geom_pointrange

[miwes...@gmail.com]

Hello:

I have a point range plot of monthly precipitation for a river basin.
What is the easiest way to change the order of months such that they
are not alphabetical? Using ddply sorts them alphabetically. Either
I want to resort the dataframe or change the order which ggplot plots
the data. Thank you.

Here is my code:

ganges_subbasin_a2pre_sort <- ddply(ganges_subbasin_a2pre, .(Month,
CATCHMENT_), summarise, med = median(precip), min = min(precip), max =
max(precip))

p <- ggplot(ganges_subbasin_a2pre_sort ,aes(x = Month, y = med, ymin =
min, ymax = max, subset = CATCHMENT_ == "Yamuna08")) +
ylab("Precipitation (mm/day)\n") + opts(title = subbasin) +
scale_colour_grey()


p + geom_pointrange(linetype = 2, colour = "navyblue") +
opts(axis.text.x = theme_text(colour = "black")) + opts(axis.text.y =
theme_text(colour = "black")) + opts(axis.line = theme_segment(colour
= "black")) + opts(axis.ticks = theme_segment(colour = "white"))

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[Brian Diggs]

On May 11, 7:11 pm, "mwestp...@gmail.com" <miwestp...@gmail.com>
wrote:

> Hello:
>
> I have a point range plot of monthly precipitation for a river basin.
> What is the easiest way to change the order of months such that they
> are not alphabetical?  Using ddply sorts them alphabetically.  Either
> I want to resort the dataframe or change the order which ggplot plots
> the data.  Thank you.

The code isn't reproducible (since we don't have
ganges_subbasin_a2pre), and the structure of that data.frame (assuming
it is a data.frame since you are using d*ply on it) has a lot to do
with your problem. However, I have a few guesses.

I assume ganges_subbasin_a2pre$Month is a character variable. ddply
turns it into a factor, and factors by default alphabetically order
their levels, and ggplot2 uses the level order by default for
factors. One way to get around this is to turn ganges_subbasin_a2pre
$Month into a factor yourself with the levels in proper chronological
order. Then this order would be preserved. Alternatively, you can
convert your month information into a continuous date-like variable
(zoo::yearmon seems like it might be appropriate for you) and then it
will be treated as a continuous time scale.

--Brian Diggs