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octave2.9 in scripts and curly braces

From: John W. Eaton
Subject: octave2.9 in scripts and curly braces
Date: Mon, 11 Dec 2006 12:03:03 -0500

On 11-Dec-2006, Eric Chassande-Mottin wrote:

| I'm having a problem with octave 2.9.9 used in a
| script like the one below:
| -----------------------------------------------------------------------
| #!/usr/bin/octave2.9 -qf
| argument=argv{1};
| -----------------------------------------------------------------------
| the script gives the following error:
| error: built-in function cannot be indexed with {
| error: evaluating assignment expression near line 3, column 9
| error: near line 3 of file `./'
| curly braces are both used to index the arguments of the script
| and structures in Octave v2.9, hence the error.
| is there a simple escape?

In earlier versions of Octave, argv was a variable.  In recent 2.9.x
snapshots, all built-in variables have been replaced with functions
(see the NEWS file).  So now you must write

  args = argv ();

  arg1 = args{1};
  arg2 = args{2};


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