User`s guide

Major Bug Fixes
2-19
This bug fix introduces a backwards incompatibility. When A is a function Afun
and
sigma = 'sm', Afun must now return Y=A\x. Prior to MATLAB 6.1, eigs
required
Afun to return y = A*x for this case.
quad Sampling Improved
In MATLAB 6.0, quad('cos(4*n*x)',-pi,pi) returned 2*pi instead of 0.
When
quad initially sampled the function, it incorrectly assumed the function
is the constant 1 over the interval
[-pi,pi] and so returned 2*pi early. It now
samples more carefully and returns
0.
griddata3 Inner Matrix Error Message
In MATLAB 6.0, an internal error sometimes caused griddata3 to display the
error message,
Inner matrix dimensions must agree. This error has been
corrected.
Improved Handling of Degenerate Triangulation
In MATLAB 6.0, there were sometimes problems associated with degenerate
triangulation. For example,
convhull could produce a convex hull that did not
cover all the original data. MATLAB 6.1 corrects this problem by replacing the
utility function
delaunayc with Qhull.
Error Message Display for Qhull-Related Functions
In MATLAB 6.0, Qhull-related functions (e.g., delaunayn) displayed error
messages in standard error. For UNIX platforms, standard error is different
from the command window. For MATLAB 6.1, error messages are displayed in
the command window.
histc Computes First Two Bins Correctly
Prior to MATLAB 6.0, histc produced the wrong results for the first two bins
for cases with extremely nonuniform bin edges. This problem was corrected in
MATLAB 6.0.