Hi,
I wish to use R (version 2.13.1)?from within Matlab(ver R2009a) on windows XP
plaform (on both 64 bit and 32 bit OS) . For this I have installed StatConnector
(http://rcom.univie.ac.at/download/current/statconnDCOM.latest.exe) for calling
R from within Matlab (R2009a) on Windows XP platform. I have added all the files
of MATLAB_RLINK folder (downloaded from
http://www.mathworks.com/matlabcentral/fileexchange/5051) into the
default?Matlab working path?(D:\User\MATLAB) and also added the folder
MATLAB_RLINK to the matlab path C:\Program Files\MATLAB\R2009a\toolbox . It
seems that Matlab is able to connect to R however I am facing a problem while
trying to call R functions from within Matlab. I have loaded all required
libraries. Shown below is the sequence of commands tried in blue, outcomes in
black and errors/unexpected/ undesired outcomes in red colour, and my comments
in black,italic ?after the command:
>> [a b c] = openR
a =???? 1
b =???? ''
c =???? COM.StatConnectorSrv_StatConnector
>> Rdemo
b =???? 1???? 4???? 9??? 16??? 25??? 36??? 49??? 64??? 81?? 100
c =???? 2???? 5??? 10??? 17??? 26??? 37??? 50??? 65??? 82?? 101
I then tried running the Rdemo available on
http://www.mathworks.com/matlabcentral/fx_files/5051/1/content/Rdemo.html
evalR('demo("persp")') works well. Also the arithmetic
functions all work well:
a = 1:10;
putRdata('a',a)
b = evalR('a^2')
evalR('b <- a^2');
evalR('c <- b + 1');
c = getRdata('c')
However ?Now copy the volcano data into MATLAB? section and all related sessions
therefore don?t work.
>> volcano = getRdata('volcano')
volcano =???? []
>> size(volcano)
ans =???? 0???? 0
>> surf(volcano);
(see the attached figure:surf_volcano_output.jpg)
It seems Matlab is able to read/get data from R. Other subsequent commands
related to this section don?t work.
I tried looking at the loaded libraries in R and in Matlab. In R everything
works well, but doesn?t seem to be so in Matlab:
>> [a b c] = evalR('.libPaths()')
a = C:/Program Files/R/R-2.13.1/library
b =???? 1
c = ?????''
>> [a b c] = evalR('library()')
a = ??'ActiveX VT_ERROR: '
??? 'base'
??? 'ActiveX VT_ERROR: '
b =???? 1
c =???? ''
>> [a b c] = evalR('library(rgdal)')
a = 'rscproxy'
??? 'lattice'
??? 'fields'
??? 'spam'
??? 'rgdal'
??? 'sp'
??? 'stats'
??? 'graphics'
??? 'grDevices'
??? 'utils'
??? 'datasets'
??? 'methods'
??? 'base'
b =???? 1
c =???? ''
As it shows that rgdal library is loaded, also the rscproxy library is loaded,
in addition to all others. I tried following:
imshow(imread('testimg_p.tif')) displays the image properly, however
calling this from R using rgdal from within Matlab gives error;
>> [a b c] = evalR('img <-
readGDAL("testimg_p.tif")')
a = ?????[]
b = ?????0
c = Invoke Error, Dispatch Exception: Object is static; operation not allowed
The command works from R prompt:
> img <- readGDAL("testimg_p.tif")
testimg_p.tif has GDAL driver GTiff
and has 280 rows and 272 columns
It is giving same error while loading gstat library:
>> [a b c] = evalR('library(gstat) ')
a =???? []
b =???? 0
c = Invoke Error, Dispatch Exception: Object is static; operation not allowed
I guess the error is not related to readGDAL or gstat library but something else
which I am unable to trace. I have also tried to explore if this is problem
related to version of Matlab/windows 64/32 bit or R version but even that does
not seem to be an issue. (I have tried this on two differemt machines one
Workstation with?WinXP 64 bit OS?with R version 2.13.1and Matlab Version 7.8.0
R2009a and also?on another?portable workstation with?WinXP 32 bit?OS with R
version 2.12.1 and Matlab Version 7.8.0 R2009a. This indicates that version of R
or Matlab or win version 64 bit/32 bit does not seem to be an issue.
I also checked for some solution on page
http://www.mathworks.com/matlabcentral/fileexchange/5051 where others also faced
somewhat similar problem and it was suggested to check for setting R_HOME and
PATH variables in the environment variables for your system. I understand I had
followed all instructions carefully and hopefully all paths/R_HOME were set
correctly, as the command evalR('.libPaths()') recognized R home path
correctly. ?
I request R team to help.
Vandita Srivastava
Scientist/Engineer "SE",
Indian Institute of Remote Sensing(NRSC),
ISRO/Department of Space, Govt. of India
>>Please don't print this Email unless you really need to - this will
preserve trees
on planet earth.
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