Hi Prof. Lee and hackers,
Yes - I understand the resulting array has length zero; what
I didn't get was why this creates a problem. I expected that
if myArr == {}, then myArr.length() should evaluate to 0. For
arrays of length >= 1, this expression returns the expected
positive integer.
A mid-August 2004 thread, "zero-length arrays", covers this.
It seems they are not "supported" (the discussion considers
whether this is a good idea in the first place). I'm still
getting to know the type system, so I don't grasp everything
discussed - zero-length arrays can obviously occur, but other
aspects of the typesys / exprlang do not handle them.
So, now I'm trying different things to find another way of
doing this sort of filtering. To fully understand the root of
the error will take a bit more digging ;-) It's right there
on line 76 of ArrayToken.java, though - constructing a new one
with value.length == 0 is a no-no...
Thanks,
Chuck
-----Original Message-----
From: Edward A. Lee [mailto:[EMAIL PROTECTED]
Sent: Monday, May 15, 2006 12:52 PM
To: Lutz, Charles D
Cc: ptolemy-hackers@bennett.EECS.Berkeley.EDU
Subject: Re: Error: "The length of the specified array is zero."
Looks like "Russian" is not in your dressingsList.
Hence, you get a length zero array.
Edward
At 10:30 AM 5/12/2006, Lutz, Charles D wrote:
>Hi folks,
>
>I'm trying to figure out what is wrong in the
>attached model; I am trying to extract an
>element from an array, and from what I can tell, I think it should
work.
>
>The problem occurs with both ArrayElement and
>ArrayLength (I haven't tested with
>similar other actors). Without one of these in
>the path, I get tokens of the form e.g.
>{4} on the "Found Indices" display. This looks
>like an array of length 1. As soon as I
>insert ArrayElement or ArrayLength in the flow,
>I get an error, "The length of the
>specified array is zero."
>
>I've been stepping through this in Eclipse but I
>haven't found where the problem occurs.
>
>Again, it seems like what is coming out of the
>Expression actor are in fact arrays, so
>ArrayLength (or similar) should be happy... am I missing something
basic?
>
>Thanks for any tips,
>
>Chuck Lutz
>Lockheed Martin
>Systems of Systems - Modeling and Operations Analysis
>BMC4I Modeling and Simulation
>Moorestown, NJ
>(856)638-7234 (office)
><mailto:[EMAIL PROTECTED]>[EMAIL PROTECTED]
>
>"Everyone spoke of an information overload, but what there
>was in fact was a non-information overload."
>- Richard Saul Wurman
>
------------
Edward A. Lee
Professor, Chair of the EE Division, Associate Chair of EECS
231 Cory Hall, UC Berkeley, Berkeley, CA 94720-1770
phone: 510-642-0253 or 510-642-0455, fax: 510-642-2845
[EMAIL PROTECTED], http://ptolemy.eecs.berkeley.edu/~eal
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