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

[John Kane]

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

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