Error: could not find function "ddply"

[Paul]

Hi - I'm trying to work through the examples found here http://tinyurl.com/c9jvmys
but after loading library(ggplot2) i can't find 'ddply', or 'melt' for
that matter. i'm on a windows 7 machine. I'm not an R expert, but not
a novice either, but this has me beat Any help would be appretiated.

Cheers
Paul

[Stuart Luppescu]

ggplot2 doesn't load those automatically. To get ddply you have to load
plyr; reshape2 for melt.
library(plyr)
library(reshape2)

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[R. Michael Weylandt]

You also need to load the plyr package with library(plyr). That should
make ddply available.

It used to be that plyr was added to the search path upon loading
ggplot2, but with the namespace redesign ddply isn't automatically
exported.

Michael

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[Derek Borba]

ddply is part of the plyr package
melt is part of the reshape2 package

plyr: 
Check the Split-Apply-Combine link
http://plyr.had.co.nz/ 

Also check Hadley's short courses
http://courses.had.co.nz/ # Multiple short courses on Hadley's packages
http://courses.had.co.nz/09-user/   #Short course for PLYR


reshape2:
http://cran.r-project.org/web/packages/reshape2/reshape2.pdf
 
Derek

Paul

[Derek Borba]

Here's a talk Hadley gave with examples of how on use plyr and ggplot2 in concert -- very helpful if you're new to the packages.
http://www.youtube.com/watch?v=TaxJwC_MP9Q

Derek

[Susan]

I had the same issue, but running code that worked in the past. I have R 3.1.1 and recently updated plyr to 1.8.3. Got an error when using ddply (with plyr loaded). Adding reshape2 (suggested below) fixed the problem.