Henrik,
           OK, finally I got the problem:  I have an  apostrophe in my
windowns 7 user name. That mess up the file name. So I logged in using a
guest account and it works:

Received cmd: 1
"eval" string: "B"
B =
   -0.1347
Sent byte: 0
Received cmd: 1
"eval" string: "variables = {'B'};"
Sent byte: 0
Received cmd: 2
save tempname-V6 B
answer=0

Thanks a lot for your patience and help.
One final question, the variable B I got from Matlab is not just a numeric
value, it is:

> B
$B
           [,1]
[1,] -0.1346952
attr(,"header")
attr(,"header")$description
[1] "MATLAB 5.0 MAT-file, Platform: PCWIN, Created on: Sat Aug 28 18:40:26
2010                                                  "
attr(,"header")$version
[1] "5"
attr(,"header")$endian
[1] "little"
How can I get only the numeric value, that ' -0.1346952' part?


Thanks again,

Michael
On Fri, Aug 27, 2010 at 7:59 AM, michael <tufemichael@gmail.com> wrote:

> Hi,all
>                      I have a problem running R.matlab package
> (under 2.10.1 version). I can set up the matlab server under local
> machine(run the MatlabServer.m), "
>
>
> And I can use setVariable and evaluate matlab functions in R. But when I
> ask
> Matlab to send the value back to R using getVariable function it
> always returns an error:
> "
> ??? Error: A MATLAB string constant is not terminated properly.
>
> Error in ==> MatlabServer at 197
>     eval(expr);
> "
>
> it seems matlab have put the data into a temporary file, so my remote
> option is actually FALSE? (how to set it to be true?), or otherwise
> what could be the possible problem since I can send data to matlab
> from R but not vice versa.
>
>
>
> > sessionInfo()
> R version 2.10.1 (2009-12-14)
> i386-pc-mingw32
>
> locale:
> [1] LC_COLLATE=English_United States.1252
> [2] LC_CTYPE=English_United States.1252
> [3] LC_MONETARY=English_United States.1252
> [4] LC_NUMERIC=C
> [5] LC_TIME=English_United States.1252
>
> attached base packages:
> [1] stats     graphics  grDevices utils     datasets  methods   base
>
> other attached packages:
> [1] R.utils_1.5.0     R.matlab_1.3.1    R.oo_1.7.3        R.methodsS3_1.2.0
>
>
> > traceback()
> 5: file(con, open = "rb")
> 4: readMat.default(filename)
> 3: readMat(filename)
> 2: getVariable.Matlab(matlab, "B")
> 1: getVariable(matlab, "B")
>
> Thanks,
>
> Michael
>

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