MATLAB DATABASE TOOLBOX RELEASE NOTES Guida Utente Scaricare il pdf (Pagina 67)

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

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.

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MATLAB DATABASE TOOLBOX RELEASE NOTES Guida Utente Pagina 67