Hi Arun,
This is a little tricky to reproduce unless you have installed FastRWeb,
and then started the FastRWeb server. I'm executing these scripts from
the browser through a call to FastRWeb running on a local port.
Installation is documented here and is quick and straightforward on Linux:
https://rforge.net/FastRWeb/
and an example here:
http://jayemerson.blogspot.mx/2011/10/setting-up-fastrwebrserve-on-ubuntu.html
I'm using FastRWeb to build a simple web service. As long as I stick to
data.frame methods, everything works fine and I get the expected plots
and HTML output in the browser. But calls to data.table methods (merge,
extract) all seem to default to data.frame, and I really don't know how
to debug that.
I am copying Simon Urbanek who's the maintainer of FastRWeb, in case
this is more of a FastRWeb issue.
Here is my session info (I am on CentOS 5 and cannot easily upgrade to R
3.0.2).
> sessionInfo()
R version 2.15.2 (2012-10-26)
Platform: x86_64-redhat-linux-gnu (64-bit)
locale:
[1] C
attached base packages:
[1] stats graphics utils datasets grDevices methods base
other attached packages:
[1] ggmap_2.3 ggplot2_0.9.3.1 RColorBrewer_1.0-5
raster_2.2-12
[5] rgeos_0.3-3 rgdal_0.8-16 sp_1.0-14 data.table_1.8.10
[9] RJDBC_0.2-3 rJava_0.9-6 DBI_0.2-7 rj_1.1.2-3
loaded via a namespace (and not attached):
[1] MASS_7.3-23 RJSONIO_1.0-3 RgoogleMaps_1.2.0.5
[4] colorspace_1.2-4 dichromat_2.0-0 digest_0.6.4
[7] grid_2.15.2 gtable_0.1.2 labeling_0.2
[10] lattice_0.20-24 mapproj_1.2-2 maps_2.3-6
[13] munsell_0.4.2 plyr_1.8 png_0.1-7
[16] proto_0.3-10 reshape2_1.2.2 rj.gd_1.1.0-1
[19] rjson_0.2.13 scales_0.2.3 stringr_0.6.2
[22] tools_2.15.2
Thanks all!
--Mel.
On 2/17/2014 6:58 AM, Arunkumar Srinivasan wrote:
Mel,
I'm not able to reproduce this on 1.8.11. Which version are you using?
I'm not aware of this package, and what 'otable' is supposed to do.
But I get no output while running your script, and not the error
message as well.
On Mon, Feb 17, 2014 at 11:14 AM, Bacou, Melanie <[email protected]
<mailto:[email protected]>> wrote:
Hi,
I am testing an R script using FastRWeb (through Rserve). FastRWeb
works as expected and I can successfully runs Simon Urbanek's
examples. Problems arise when I try to merge datatables. It seems
FastRWeb cannot find merge.data.table().
I'm using plenty of other libraries (ggplot, raster, RJDBC, etc.)
that execute successfully through FastRWeb scripts, so I'm
guessing it's something peculiar to data.table.
Thanks for any help! --Mel.
Here are reproducible examples.
Test #1: the code below (the entire content of my R script) SUCCEEDS:
# test1.R
library(data.table)
run <- function(...) {
oclear()
d1 <- data.table(a=c(1,2,3), b=c("a","b","c"))
d2 <- data.table(e=c("v","a","b"), f=c(4,6,7))
otable(d1)
otable(d2)
}
This returns a simple web page showing 2 tables:
1 a
2 b
3 c
v 4
a 6
b 7
Test #2: the code below (the entire content of my R script) FAILS
with:
Error in `[.default`(x, i) : invalid subscript type 'list'
# test2.R
library(data.table)
run <- function(...) {
oclear()
d1 <- data.table(a=c(1,2,3), b=c("a","b","c"))
d2 <- data.table(e=c("v","a","b"), f=c(4,6,7))
otable(d1)
otable(d2)
setkey(d1, b)
setkey(d2, e)
otable(d1[d2])
}
--
Melanie BACOU
International Food Policy Research Institute
Agricultural Economist, HarvestChoice
Work+1(202)862-5699 <tel:%2B1%28202%29862-5699>
[email protected] <mailto:[email protected]>
Visitharvestchoice.org <http://harvestchoice.org>
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--
Melanie BACOU
International Food Policy Research Institute
Agricultural Economist, HarvestChoice
Work +1(202)862-5699
E-mail [email protected]
Visit harvestchoice.org
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