[R] Matlab import

[Henrik Bengtsson]

Hi,

as already mentioned, do not save MAT files in ASCII format but save
to binary formats, i.e. do *not* use "-ascii".  Moreover, from
?readMat, you find that:

     "From Matlab v7, _compressed_ MAT version 5 files are used by
     default [3]. These are not supported. Use 'save -V6' in Matlab to
     write a MAT file compatible with Matlab v6, that is, to write a
     non-compressed MAT version 5 file. Note: Do not mix up version
     numbers for the Matlab software and the Matlab file formats."

You haven't told use what version of R you are using (neither what
version of R.matlab), but from the error message I suspect you are
using Matlab v7, correct?  If so, try to save with

   save('test.mat', 'matrixM', '-ascii', '-V6')

and tell us if it works.

Cheers

Henrik


On 4/10/07, Schmitt, Corinna <Corinna.Schmitt at igb.fraunhofer.de> wrote:
> Hallo,
>
> >With readMat, don't use the "-ascii" option (which you didn't have in your
> >first posting). I've never tried reading matlab's ascii format. In any >case,
> >readMat reads matlab's binary format.
>
> >- Tom
>
> I did the saving again without 'ascii' option but the import also did not work. I get the following error message:
>
> > library(R.matlab)
> > mats <- readMat("Z:/Software/R-Programme/test2.dat")
> Fehler in list("readMat("Z:/Software/R-Programme/test2.dat")" = <environment>,  :
>
> [2007-04-10 14:57:52] Exception: Tag type not supported: miCOMPRESSED
>   at throw(Exception(...))
>   at throw.default("Tag type not supported: ", tag$type)
>   at throw("Tag type not supported: ", tag$type)
>   at readMat5DataElement(this)
>   at readMat5(con, firstFourBytes = firstFourBytes, maxLength = maxLength)
>   at readMat.default("Z:/Software/R-Programme/test2.dat")
>   at readMat("Z:/Software/R-Programme/test2.dat")
> >
>
>
> Any further idea,
> Corinna
>
> ----------------------------------------------------------------------------
>
>
> Schmitt, Corinna wrote:
> >
> > Hallo,
> >
> >>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
> >
> > I have imported this package, too. And tried your commands with the new
> > txt-file as mentioned in my last mail to the mailing list.
> >
> > I get the following error command:
> > mats = readMat("Z:/Software/R-Programme/test.dat")
> > Error in if (version == 256) { : Argument hat Länge 0
> > Zusätzlich: Warning message:
> > Unknown endian: . Will assume Bigendian. in: readMat5Header(this,
> > firstFourBytes = firstFourBytes)
> >
> > What did I wrong? Please check my txt-file which was constructed with the
> > matlab command "save('test.dat','matrixM','-ascii')"
> >
> > Thanks, Corinna
> >
> > ----------------------------------------------------------------------------
> >
> >
> > 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
> >> �
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> >> å3
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> > �[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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> > http://www.nabble.com/Matlab-import-tf3552511.html#a9918327
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> >
> > ______________________________________________
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> > 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.
> >
> > ______________________________________________
> > 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.
> >
> >
>
> --
> View this message in context: http://www.nabble.com/Matlab-import-tf3552511.html#a9918787
> Sent from the R help mailing list archive at Nabble.com.
>
> ______________________________________________
> 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.
>
> ______________________________________________
> 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.
>