Le 27/05/2018 à 23:23, philippe a écrit :
Le 27/05/2018 à 19:51, Samuel Gougeon a écrit :
[...]
Please let us know more about your proposal for 1 instead of 0.
I can't say it now, the best value also depends on the compatibility of
this value with others assigned to matrix functions with argument [].
I would like to check it before, but with the example you mention 0 looks
a better choice.
As far as i understand, rcond(X) should return the inverse of cond(X,1).
In Scilab, rcond([]) returns []. This looks pretty inconsistent with any
Scilab cond([],p) result,
and does not help much for this longly empty cond([]) discussion.
In Octave, rcond([]) returns %inf, that's consistent with cond([])==0.
However, still, a guy whose det() is 1 and norm() is 0 is really a
special guy.
If we have no evidence/reference on the fact norm([]) is 1 rather than 0,
i guess that we will change Scilab's cond([]) to 0.
May the Scilab creator having initially set 1 read us and correct us if
it's needed.
Cheers
Samuel
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