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Reading .mat files

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Sam Da
Sam Da 2011-11-12
Please take a look at the location: http://scgroup20.ceid.upatras.gr:8000/tmg/
Under SAMPLE OUTPUT, you can download the following: MEDLINE: term-document matrix (5,735 x 1,033), dictionary (5,735 indexing terms), query matrix (30 queries)
They are all in .mat format.
When I import the matfiles in Matlab, it says e.g. A_med<5735x1033 double>
But when I do something like: A = A_med(1:10,1:10)
It is displayed as: A =
(3,2) 2
(4,2) 2
(8,2) 2
(6,6) 1
What format is this really?

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Walter Roberson
Walter Roberson 2011-11-12
That display is used for sparse matrices. Sparse matrices are (in current versions) restricted to double precision, or logical.
You can use issparse() to determine whether a matrix is sparse or not.

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