% Buglist for the '89 revision of the Matlab Delta Toolbox
% --------------------------------------------------------
%
% 1. del2z.m	does not work correctly with first order
%           	state space systems (the problem was the
%           	previous "eye(a)" statement).
% 2. delgram.m	does not work correctly with anything but
%            	first order systems due to an incorrect
%            	stability check.
% 3. delbode.m	did not work correctly if there were poles
%           	at the origin. Also, not too good if there
%           	were lightly damped poles/zeros.
% 4. delnic.m	similar problems to delbode, plus did not
%            	show any phase values outside -180 -> 0.
%            	(also far too slow previously).
%
%
% Buglist for the '91 revision of the Matlab Delta Toolbox
% --------------------------------------------------------
%
% 1. delfreq.m	did not work correctly with  numerator and
%		denominator forms, unless the numerator
%		vector was of the same length as the
%		denominator. The error was due to zeros
%		being padded to the wrong end of num.
%
%
% Buglist for the 9/92 revision of the Matlab Delta Toolbox
% --------------------------------------------------------
%
% 1. delbode.m	did not correctly return the phase of the
%		frequency response. Also, returned w as
%		a row vector, whereas its probably better
%		to have w a column vector.
%
% 2. delstep.m	(not really a bug), but delstep previously
%		required the control toolbox. This is no
%		longer the case.
%
% 3. c2deld.m	previously did not work correctly for
%		fractional delays (unless you were lucky
%		enough to select delta=1).
%
% Buglist for 5/95 Revision of the Delta Toolbox:
% -----------------------------------------------
%
% 1. selectw.m  (with consequential effects on delbode,
%               delnic, etc.). Did not do a sensible job
%               of selecting frequencies if there were
%               very high frequency zeros (e.g. due to
%               numerical errors in high order numerator
%               coefficients.
%
% 2. delnyq.m   Did not work correctly for systems with a
%               pole at the origin.