Error in eval(expr, envir, enclos) : could not find function "eval"

[jowens]

Trying to build @hadley's ggplot2 book. It requires ggthemes. Installing ggthemes yields an issue with eval. Any suggestion for me? (Presume the warnings are related to the previous issue.)

> install.packages("ggthemes")
Installing package into '/Users/jowens/Library/R'
(as 'lib' is unspecified)
trying URL 'http://cran.cnr.Berkeley.edu/src/contrib/ggthemes_2.2.1.tar.gz'
Content type 'application/x-gzip' length 433489 bytes (423 KB)
==================================================
downloaded 423 KB

* installing *source* package 'ggthemes' ...
** package 'ggthemes' successfully unpacked and MD5 sums checked
** R
** inst
** preparing package for lazy loading
Warning: replacing previous import by 'grid::arrow' when loading 'ggthemes'
Warning: replacing previous import by 'grid::unit' when loading 'ggthemes'
Warning: replacing previous import by 'scales::alpha' when loading 'ggthemes'
Error in eval(expr, envir, enclos) : could not find function "eval"
Error : unable to load R code in package 'ggthemes'
ERROR: lazy loading failed for package 'ggthemes'
* removing '/Users/jowens/Library/R/ggthemes'

mission-burrito 9662$ R

R version 3.2.1 (2015-06-18) -- "World-Famous Astronaut"
Copyright (C) 2015 The R Foundation for Statistical Computing
Platform: x86_64-apple-darwin14.4.0 (64-bit)

[jrnold]

The issue #35 deals with the warnings. However, the problem with eval seems to be the switch in how ggplot2 handles its geom objects. I'll fix this, but it may be a few days until I can get to it.

[jowens]

Super. Thanks!

[jrnold]

Though I may push back that assessment a bit; I'll need to grok the way the new geoms and ggproto works to translate the geoms in ggthemes. Maybe you can build with an earlier version of ggplot2?

[jowens]

Hadley requires a dev version of ggplot2 to build the book, so that won't work.

I've been intermittently trying to build the book for the past few months. I haven't succeeded yet. This is the first time I've got to ggthemes though, so I must be making progress.

[hadley]

It should be a fairly straightforward translation - I'd say an hour tops, to figure out what's changed and how to update your geoms. The code inside ggplot2 has been cleaned up quite a bit, so if you just pick a random geom and look at its source you should be able to see what you need to do pretty easily.