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\chapter*{Revision History}
\addcontentsline{toc}{chapter}{Revision History}
\lhead{Revision History}
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\item[2.01 (06-19-92)] ODRPACK 2.01 corrects two minor errors. The
first affected the derivative checking procedure, and
the second affected the values specified by {\tt
NDIGIT}. The solutions found by ODRPACK 2.00 were not
affected in any way by the first of these errors, and
were not seriously affected by the second.
Version 2.01 also encorporates several other minor
modifications that further improve the code. The most
significant of these modifications changes how the
scale values are used within the solution procedure.
This change should increase the robustness of the
procedure for poorly scaled problems, and will result
in slightly different computed results for all
problems. Another of these changes is to the report
generated by the derivative checking procedure. This
report now includes the user supplied derivative value,
as well as the relative difference between the user
supplied value and the finite difference value it was
checked against. This should help users assess the
validity of the checking procedure results.
The ``ODRPACK 2.01 User's Reference Guide'' is
essentially the same as the version 2.00 Guide (NISTIR
89-4103, Revised). The major differences are that
\blC
\item the minimum length of array {\tt WORK} has been
increased by $(p+m)q$ locations, and
\item the sample programs and output shown in
Chapter~2, and the discussion of the derivative
checking results in Chapter~5 have been modified
to reflect the above mentioned changes.
\end{list}
\item[2.00 (03-04-92)] ODRPACK 2.00 adds several new features to those
available in version 1.8 and earlier versions.
\blC
\item With version 2.00, ODRPACK can now easily
accommodate complex and other types of
multiresponse data, i.e., data where each
observation is multidimensional.
\item It can handle implicit as well as explicit
models.
\item The weighting scheme has been enhanced to allow
for instances when the components of a
multidimensional observation are correlated.
\item A facility for computing central finite
difference derivatives has been added.
\item The amount of work space required for the
computations has been reduced for most
problems.
\end{list}
{\em Because of these new features, the argument lists
for the ODRPACK 2.00 user callable subroutines,
including the user supplied subroutine {\tt FCN} that now
comprises the functionality of subroutines {\tt FUN} and
{\tt JAC}, are not the same as for earlier versions.} The
interpretations of some arguments have changed, and new
arguments have been added. In addition, the arguments
have been reordered, with arguments having similar
purpose now grouped together. Those who have been
using an earlier release of ODRPACK should be
especially careful to examine the new calling
sequences, and the definitions for subroutine arguments
{\tt FCN}, {\tt JOB}, {\tt WE} and {\tt WD}.
\item[1.80 (12-18-90)] ODRPACK 1.80, a test release with only limited
distribution, differs from prior releases in several
respects.
\blC
\item The number of function evaluations required to
find the solution has been reduced, and the
``restart'' facility has been modified to
better accommodate cases where the user
supplied subroutines {\tt FUN} and/or {\tt JAC} are
very time consuming.
\item The printed reports have been redesigned to
identify parameters that induce rank
deficiency, and to include a 95\% confidence
interval for the estimated parameters.
\item Several enhancements have been added to the
covariance matrix computations, including the
option of constructing the covariance matrix
without incurring any additional derivative
evaluations.
\item The finite difference approximation to the
Jacobian matrix has been improved.
\end{list}
\item[1.71 (07-27-89)] ODRPACK 1.71 corrects an error in the code that
performs the computation of finite difference
derivatives with respect to the errors $\Delta$ when
$m\ge2$ and the default value of {\tt IFIXX} is invoked.
(The default value of {\tt IFIXX} is invoked when {\tt
IFIXX(1,1)} is set to a negative value or when ODRPACK
routines {\tt DODR} or {\tt SODR} are called.) This error
could result in incorrect ``fixing'' of the explanatory
variables, which would affect the final solution. Such
``fixing'' could be detected by observing the presence
of estimated values for $\Delta$ that are identically
zero. The error could go undetected by the user,
however, if the values of $\Delta$ were not examined
after the fit.
\end{list}
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