>>>>> "roger" == roger koenker <[EMAIL PROTECTED]>
>>>>> on Sun, 9 Jul 2006 12:31:16 -0500 writes:
roger> On Jul 9, 2006, at 11:06 AM, Douglas Bates wrote:
>> Your matrix Mc should be flagged as invalid. Martin and
>> I should discuss whether we want to add such a test to
>> the validity method. It is not difficult to add the test
>> but there will be a penalty in that it will slow down all
>> operations on such matrices and I'm not sure if we want
>> to pay that price to catch a rather infrequently occuring
>> problem.
roger> Elaborating the validity procedure to flag such
roger> instances seems to be well worth the speed penalty in
roger> my view. Of course, anticipating every such misstep
roger> imposes a heavy burden on developers and constitutes
roger> the real "cost" of more elaborate validity checking.
As I found, we already *have* a validate_dgCMatrix in C code,
and adding an improved test for the validity of the 'p' slot,
solves ``all problems'' mentioned above --- without any
performance penalty.
Hence., in the upcoming next version of 'Matrix' (0.95-12),
John will get a proper error message immediately from
calling new(...) with the wrong 'p' (or 'Dim').
Martin
roger> [My 2cents based on experience with SparseM.]
roger> url: www.econ.uiuc.edu/~roger Roger Koenker email
roger> [EMAIL PROTECTED] Department of Economics vox:
roger> 217-333-4558 University of Illinois fax: 217-244-6678
roger> Champaign, IL 61820
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