Ah , thanks Sarah
So that's why the error message changed! I was getting different one earlier.
I had defined rect earlier and apparently, when stripping down the code I negelected to include it in the example. Renamed rect as rectlib
Now what I get is "Error in eval(expr, envir, enclos) : object 'federal.ps' not found" which is what I was getting ealier although at one point I was getting "year not found".
See revised code.
library(ggplot2)
fcs <- structure(list(year = structure(c(954478800, 986014800, 1017550800,
1049086800, 1080709200, 1112245200, 1143781200, 1175313600, 1206936000,
1238472000, 1270008000, 1301544000, 1333166400), class = c("POSIXct",
"POSIXt"), tzone = ""), federal.ps = c(211925L, 223933L, 237251L,
242737L, 244158L, 243971L, 249932L, 254622L, 263114L, 274370L,
282955L, 282352L, 278092L)), .Names = c("year", "federal.ps"),
class = "data.frame", row.names = c(NA, -13L))
rectlib <- data.frame (xmin = as.POSIXct("2000-03-31", "%Y-%m-%d"),
xmax = as.POSIXct("2006-10-31", "%Y-%m-%d"))
p <- ggplot(fcs, aes(year, federal.ps )) + geom_line()
p + geom_rect(data=rectlib, aes(xmin=xmin, xmax = xmax, ymin=-Inf, ymax = Inf),
fill='red', alpha=0.2)
###===================End Code==================================================
John Kane
Kingston ON Canada
-----Original Message-----
From: sarah.goslee at gmail.com
Sent: Fri, 22 Mar 2013 16:49:34 -0400
To: jrkrideau at inbox.com
Subject: Re: [R] ggplot2 will not draw a rectangle. Error: ggplot2
doesn't know how to deal with data of class XXX"
Hi John,
This bit of your code:
geom_rect(data=rect
Your reproducible example doesn't create rect, and rect() already
exists, so geom_rect() is trying to treat a function as data.
Sarah
On Fri, Mar 22, 2013 at 4:42 PM, John Kane <jrkrideau at inbox.com> wrote:
What am I missing? When I run the code below I get the error message
"Error: ggplot2 doesn't know how to deal with data of class function"
Googling suggests a message of "Error: ggplot2 doesn't know how to deal
with data of class XXX" is not uncommon but I don't see why I am getting
a "function" error unless I am using some reserved word?
##=============Start Code=========================
library(ggplot2)
fcs <- structure(list(year = structure(c(954478800, 986014800,
1017550800,
1049086800, 1080709200, 1112245200, 1143781200, 1175313600,
1206936000,
1238472000, 1270008000, 1301544000, 1333166400), class =
c("POSIXct",
"POSIXt"), tzone = ""), federal.ps = c(211925L, 223933L,
237251L,
242737L, 244158L, 243971L, 249932L, 254622L, 263114L,
274370L,
282955L, 282352L, 278092L)), .Names = c("year",
"federal.ps"),
class = "data.frame", row.names = c(NA, -13L))
p <- ggplot(fcs, aes(year, federal.ps )) + geom_line()
p + geom_rect(data=rect, aes(xmin=xmin, xmax = xmax, ymin=-Inf, ymax
= Inf),
fill='red', alpha=0.2)
##=============End Code==========================
sessionInfo()
R version 2.15.3 (2013-03-01)
Platform: i686-pc-linux-gnu (32-bit)
locale:
[1] LC_CTYPE=en_CA.UTF-8 LC_NUMERIC=C
[3] LC_TIME=en_CA.UTF-8 LC_COLLATE=en_CA.UTF-8
[5] LC_MONETARY=en_CA.UTF-8 LC_MESSAGES=en_CA.UTF-8
[7] LC_PAPER=C LC_NAME=C
[9] LC_ADDRESS=C LC_TELEPHONE=C
[11] LC_MEASUREMENT=en_CA.UTF-8 LC_IDENTIFICATION=C
attached base packages:
[1] stats graphics grDevices utils datasets methods base
other attached packages:
[1] ggplot2_0.9.3
loaded via a namespace (and not attached):
[1] colorspace_1.2-1 dichromat_2.0-0 digest_0.6.3
grid_2.15.3
[5] gtable_0.1.2 labeling_0.1 MASS_7.3-23
munsell_0.4
[9] plyr_1.8 proto_0.3-10 RColorBrewer_1.0-5
reshape2_1.2.2
[13] scales_0.2.3 stringr_0.6.2
John Kane
Kingston ON Canada
____________________________________________________________
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