[Octave-patch-tracker] [patch #9282] add minres for sparse linear systems

[Xie Rui]

Follow-up Comment #4, patch #9282 (project octave):

There are still a lot of problems now:

0 There is an output that matlab minres has but I do not know its meaning.
This is resveccg. Therefore, I didn't add it as an output.
0 My minres has 5 kinds of flags now, but I doubt its performance. Is there
good methods to detect ill-conditioned matrix, when the information of this
matrix is given by the form of matrix or functions which return the results of
applying the inverse? And what about detecting matrix that is not sysmmetric
or hermitian? Need tolerance here?
0 My minres requires that if m1 and m2 both exist, then they should be both
matrices or both function handles. However, in function pcg, m1 and m2 may be
of different types.
0 The paper I based on (matlab bases on it too according to the
docummentation) says the matrix A should be real. I have not checked carefully
whether it works with complex matrices, although it passed some tests.

I think maybe it is far from being a new function in Octave now, and I will
continue to do the remaining work.





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