From help-octave-request  Tue Feb  9 23:34:08 1993
Subject: Version 0.67 is available from ftp.che.utexas.edu
From: John Eaton <jwe>
To: help-octave
Date: Tue, 09 Feb 93 23:36:44 CST

Version 0.67 of Octave is available via anonymous ftp from
ftp.che.utexas.edu in the directory /pub/octave along with diffs from
previous versions.

In addition to a number of bug fixes, here is a summary of recent
changes:

Summary of changes for version 0.67:
-----------------------------------

  * New functions:

      find -- return the indices of nonzero elements.

  * Zero-one style indexing now works.  For example,

      a = [1,2,3,4];
      b = a([1,0,0,1])

    sets b to the first and fourth elements of a.

    Zero-one style indexing also works for indexing the left hand side
    of an assignment.  For example,

      a = rand (1,2;3,4);
      a([0,1],:) = [-1,-2]

    sets the second row of a to [-1 -2]

    The behavior for the ambiguous case

      a = [1,2,3,4];
      b = a([1,1,1,1]);

    is controlled by the new global variable `prefer_zero_one_indexing'.
    If this variable is equal to 'true', b will be set to [1 2 3 4].
    If it is false, b will be set to [1 1 1 1].  The default value is
    'false'.

  * Using the new global variable `propagate_empty_matrices', it is
    possible to have unary and binary operations on empty matrices
    return an empty matrix.  The default value of this variable is
    'warn', so that empty matrices are propagated but you get a
    warning.  Some functions, like eig and svd have also been changed
    to handle this.

  * Empty matrices can be used in conditionals, but they always
    evaluate to `false'.  With propagate_empty_matrices = 'true', both
    of the following expressions print 0: 

      if  [], 1, else 0, end
      if ~[], 1, else 0, end

  * Octave no longer converts input like `3.2 i' or `3 I' to complex
    constants directly because that causes problems inside square
    brackets, where spaces are important.  This abbreviated notation
    *does* work if there isn't a space between the number and the i,
    I, j, or J.

Summary of changes for version 0.66:
-----------------------------------

  * Logical unary not operator (~ or !) now works for complex.

  * Left division works.

  * Right and left element by element division should work correctly
    now.

  * Numbers like .3e+2 are no longer errors.

  * Indexing a matrix with a complex value doesn't cause a core dump.

  * The min and max functions should work correctly for two arguments.

  * Improved (I hope!) configuration checks.

  * Octave is now installed as octave-M.N, where M and N are version
    numbers, and octave is a link to that file.  This makes it
    possible to have more than one version of the interpreter installed.


--
John W. Eaton      | 4.3BSD is not perfect.  -- Leffler, et al. (1989).
jwe at che dot utexas dot edu|  |