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another case of undocumented syntax

john doe 4 years ago updated by Pavel Holoborodko 4 years ago 7

from Version History:

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[US,TS, Success] = ordschur(...) % three-outputs, with status as last one.

Note:

ORDQZ has the same peculiarity - see GCARE or GDARE code:


[HH,JJ,~,z(perm,:),Success] = ordqz(HH,JJ,q,z,'lhp') % five outputs

Under review

Yes, absolutely! Just forgot to add it to the list.


Actually I saw the syntax in GCARE too :).


Not sure if I get the meaning of the output - how re-ordering could fail? Probably will just return 1.

It is useless, of course, but it is a relic from another time ... :)

Prior, to make it working, I used:

[z(perm,:),t] = ordschur(z,t,'lhp'); Success = 1;




Actually it might indicate few things (in case of ordqz) - problem is too ill-conditioned and transformed matrices might be too far from generalized Schur or just indicate wrong inputs (mismatching matrix dims or else). In any case toolbox will just return 1 in case of extra output parameters.


I sent to you by email a piece of reference from Matlab's childhood

Thank you for reminding, I almost forget to add this to toolbox - will add right now.

Undocumented syntax has been implemented for both routines, ordqz and ordschur (in trunk).