[Octave-bug-tracker] [bug #42562] 3.8.1 can't load mat file (>maltab r2010b)

[Henrik Bengtsson]

Follow-up Comment #18, bug #42562 (project octave):

Author of R.matlab here:

Thanks for reporting on this out.  I take it as R.matlab::writeMat()
incorrectly writes R vectors as one-dimensional arrays (i.e. the dimension
array subelement contains a single value) whereas the MAT file format requires
at least two elements.  I must admit that I've missed:

"Dimensions Array Subelement
This subelement specifies the size of each dimension of an n-dimensional array
in an n-sized array of 32-bit values (miINT32). All numeric arrays have at
least two dimensions. The Dimensions Array subelement is common to all MATLAB
array types." (page 1-17 in
http://www.mathworks.com/help/pdf_doc/matlab/matfile_format.pdf)


Q1. Should R vectors (=one dimensional arrays) be written as nx1 or 1xn
arrays?

Q2. Should I read this thread as you indeed updated Octave to workaround the
one-dimensional case?

/Henrik

PS. It'll probably be a while before I fix this in R.matlab, because I have to
careful about cases related to automatic translation/coercing of
vectors-to-matrices in writeMat() and readMat().


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