R help - Apr 2007 - Matlab import

Dear R-Experts,

here again a question concerning matlab. With the command "matrixM=[1 2
3;4 5 6]" a matrix under Matlab was constructed. It was than stored with
the command "save('matrixM.txt','matrixM')".

Now I tried to import the data in R with the help of the command
"Z=matrix(scan("Z:/Software/R-Programme/matrixM.txt"))"

An error occurred. 

The result should be a matrix with the entries as mentioned above.
Perhaps I made already an error in matlab. 

Has any one got an idea how to import the data and store it in R. In R I
want to make further calculations with the matrix. I just installed
R.matlab but could not find an example with could help me.

Thanks, Corinna
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I've used Henrik Bengtsson's R.matlab package several times to
successfully
read in matlab data files. It's normally as easy as:

library(R.matlab)
mats <- readMat("matrixM.txt")

- Tom

Tom Short
EPRI



Schmitt, Corinna wrote:
> 
> Dear R-Experts,
> 
> here again a question concerning matlab. With the command "matrixM=[1
2
> 3;4 5 6]" a matrix under Matlab was constructed. It was than stored
with
> the command "save('matrixM.txt','matrixM')".
> 
> Now I tried to import the data in R with the help of the command
> "Z=matrix(scan("Z:/Software/R-Programme/matrixM.txt"))"
> 
> An error occurred. 
> 
> The result should be a matrix with the entries as mentioned above.
> Perhaps I made already an error in matlab. 
> 
> Has any one got an idea how to import the data and store it in R. In R I
> want to make further calculations with the matrix. I just installed
> R.matlab but could not find an example with could help me.
> 
> Thanks, Corinna
> 
> MATLAB 5.0 MAT-file, Platform: PCWIN, Created on: Tue Apr 10 13:17:44 2007
> ?IM???3???x??c``p?b6 ??? ?
> ?31331;?&?eV???AjY?X???[n|
> ______________________________________________
> R-help at stat.math.ethz.ch mailing list
> https://stat.ethz.ch/mailman/listinfo/r-help
> PLEASE do read the posting guide
> http://www.R-project.org/posting-guide.html
> and provide commented, minimal, self-contained, reproducible code.
> 
> 
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Hello:

	  Two questions about R.matlab:

	  1.  How to break a hung R-Matlab connection?

	  2.  How to execute R.matlab commands from within a function?

	
BREAKING AN R-Matlab CONNECTION

	  Sometimes an attempted R.matlab command locks up my computer.  The 
standard R break process interrupts the R command.  However, when I do 
that, the command to Matlab is still pending, and I don't know an easy 
way to interrupt that.  A simple, self-contained example appears below.

	  The easiest way I've found so far to interrupt Matlab is to quit R. 
This will finally release Matlab.


CALLING R.matlab FUNCTIONS FROM WITHIN A FUNCTION

	  An R.matlab function call that works as a direct R command hangs for 
me when executed within an R function.  A simple, self-contained example 
appears below.

How can I work around this?


	  Thanks,
	  Spencer Graves
Using Matlab 7.3.0 (R2006b) under Windows XP Pro.
> sessionInfo()
R version 2.5.0 (2007-04-23)
i386-pc-mingw32

locale:
LC_COLLATE=English_United States.1252;LC_CTYPE=English_United
States.1252;LC_MONETARY=English_United
States.1252;LC_NUMERIC=C;LC_TIME=English_United States.1252

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

other attached packages:
R.matlab     R.oo      fda      zoo
  "1.1.3"  "1.2.7"  "1.2.1"  "1.3-1"

###################

#EXAMPLE:  CALLING R.matlab FROM WITHIN A FUCTION?

# 1.  library(R.matlab)
library(R.matlab)
# 2.  Create a Matlab client object to support communications
(matlab <- Matlab())
#     Optionally set setVerbose(..., -2) to get max info
setVerbose(matlab, -2)

# 3.  Start Matlab
# 4.  Ask Matlab to become a slave

#Matlab>> MatlabServer

# 5.  Open the connection from R to MatlabServer
(isOpenMatlab <- open(matlab))

# NOTE:  If Matlab is not frozen:
#R> close(matlab)
# returns local control to Matlab.
# Control of Matlab can be returned to R at any time
# by repeating steps 4 & 5.

# 6.  matlab.compute.a
compute <- evaluate(matlab, "a = 1+2")
(a0 <- getVariable(matlab, "a"))

# The above works fine for me.

# 7.  R.matlab.compute.a function
R.matlab.compute.a <- function(text="a=1+2", matlabClient=matlab){
# text = a Matlab expression that stores 'a'
   ev0 <- evaluate(matlabClient, text)
   getVariable(matlabClient, "a")
}

# The following locks up both R and Matlab for me:
R.matlab.compute.a()