Looks like the data frame needs to be reshaped before being given to
ggplot.
"melt" function from the "reshape2" package, or "gather" function from
"tidyr" package are good tools for this.
On Sun, 7 Feb 2016, Ulrik Stervbo wrote:
Hi Stefano,
you try to facet on 'variable' and 'scales' which aren't part of your
data.frame as far as I can see. The error 'At least one layer must contain
all variables used for facetting' also tells you this - that at least one
of the variables you use for facetting are missing.
Hope this helps,
Ulrik
On Sun, 7 Feb 2016 at 19:28 Stefano Sofia <stefano.so...@regione.marche.it>
wrote:
Dear list users,
I would like to have multiple plots in one page with ggplot, in particular
five graphs:
in the central plot the snow cover (hs) of two meteorological stations;
above wind direction and temperature of one of the two stations and below
wind direction and temperature of the other station.
My data frame (df) is like
date hs1 temp1 wind1 wind_dir1 pch_wind_dir1 color_wind_dir1 hs2 temp2
wind2 wind_dir2 pch_wind_dir2 color_wind_dir2
2014-12-27 00:00:00 20 -4.2 6.8 NW 5 "blue" 40 -4.2 6.8 NW 5 "blue"
2014-12-27 00:30:00 22 -4.3 4.3 NNE 5 "cyan" 42 -4.3 4.3 NNE 5 "cyan"
2014-12-27 01:00:00 24 -4.1 5.7 NNW 10 "cyan" 44 -4.1 5.7 NNW 10 "cyan"
2014-12-27 10:00:00 30 -2.6 7.2 NNW 10 "cyan" 44 -3.1 5.7 NNW 10 "cyan"
...
with 48 rows.
The ylim of hs1 and hs2 should be fixed between 0 and 200cm, hs1 colored
with blue and the other with red;
wind1 and wind2 should take the pch and color described in each row.
lapply(df, class) gives
$date
[1] "POSIXct" "POSIXt"
$hs1
[1] "numeric"
$temp1
[1] "numeric"
$wind1
[1] "numeric"
and so on.
I have been trying for a long time to do that starting from some examples
found in the web, with no success. The example code I started with is
> ggplot(df, aes(date, hs1, ymin=0, ymax=200, colour = "blue")) +
scale_colour_identity() + xlim(trunc(df$date[1], "days"),
trunc(df$date[48], "days")) + facet_grid(variable ~ ., scales = "free",
as.table = FALSE) + theme_bw()
> f1 <- f + geom_step(subset = .(variable =="HS"))
but I always get the following error:
Error in layout_base(data, rows, drop = drop) :
At least one layer must contain all variables used for facetting.
Is the problem due to how date has been specified? I tried both with
> df$date <- strptime(df$olddata, format = "%Y-%m-%d-%H-%M")
and
> df$date <- as.POSIXct(df$olddata, format = "%Y-%m-%d-%H-%M", tz = "")
but the result is the same.
Could somebody help me in that?
Thank you for your attention and your help
Stefano
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