ggplot2 will not draw a rectangle. Error: ggplot2 doesn't know how to deal with data of class XXX"

Thanks, that shows that I am not making one of my "really stupid"
mistakes.  

What is really annoying is that I can find examples on the web that
work just fine and I cannot se how my example is that different.  I
even tried changing from using as.Date() to POSIXct() and to POSIXlt in
case the dates were the problem but with no luck.

I think it's time for dinner here so I will have another look at it
tommorrow --hopefully someone will see the problem.

Thanks again.

John Kane
Kingston ON Canada

-----Original Message-----
From: sarah.goslee at gmail.com
Sent: Fri, 22 Mar 2013 17:29:42 -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"

I get "year not found" and we've exceeded my ability to debug ggplot
code. I hope someone else chimes in: I'd like to know what the answer
is too.


Sarah

On Fri, Mar 22, 2013 at 5:01 PM, John Kane <jrkrideau at inbox.com>

wrote:

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

--
Sarah Goslee
http://www.functionaldiversity.org