"Error: character argument expected" when using knit_child

[johnbaums]

Attempting to compile this Rnw to PDF in RStudio 0.98.1056 fails with the error:

Writing to file 021-ggplot2-geoms.tex
Processing code chunks with options ...
 1 : echo keep.source term verbatim (label = setup, 021-ggplot2-geoms.Rnw:8)
 2 : echo keep.source term verbatim (label = write-examples, 021-ggplot2-geoms.Rnw:15)
Error: at 021-ggplot2-geoms.Rnw:26, character argument expected
Execution halted
R version 3.1.1 (2014-07-10)
Platform: x86_64-w64-mingw32/x64 (64-bit)

Removing the line:

\Sexpr{knit_child(text = unlist(ex), quiet = TRUE)}

causes it to compile successfully.

Here's my sessionInfo():

locale:
[1] LC_COLLATE=English_Australia.1252  LC_CTYPE=English_Australia.1252    LC_MONETARY=English_Australia.1252 LC_NUMERIC=C                      
[5] LC_TIME=English_Australia.1252    

attached base packages:
[1] stats     graphics  grDevices utils     datasets  methods   base     

other attached packages:
[1] knitr_1.6.21  ggplot2_1.0.0

loaded via a namespace (and not attached):
 [1] colorspace_1.2-4 digest_0.6.4     evaluate_0.5.5   formatR_1.0      grid_3.1.1       gtable_0.1.2     MASS_7.3-35      munsell_0.4.2   
 [9] plyr_1.8.1       proto_0.3-10     Rcpp_0.11.3      reshape2_1.4     scales_0.2.4     stringr_0.6.2    tools_3.1.1 

[yihui]

Apparently (well, maybe not apparent to you), you were using Sweave to compile the Rnw file. You need to change the RStudio option to use knitr instead.

[johnbaums]

Thanks for looking into it, yihui. :)