From: "Jerry" <lanceboyle@qwest.net>
Subject: Re: Why does this work? (overloads)
Date: 8 Feb 2007 02:40:28 -0800
Date: 2007-02-08T02:40:28-08:00 [thread overview]
Message-ID: <1170931228.165961.8170@m58g2000cwm.googlegroups.com> (raw)
In-Reply-To: <xwuyh.261479$aJ.160819@attbi_s21>
Jeffrey R. Carter wrote:
> Jerry wrote:
>
> > Yes, but time series are usually indexed from 0. Sometimes, the FFT
> > of a time series is indexed from 0 and sometimes -NN/2 .. NN/2-1. When
> > one uses a time series in a vector or matrix, conundrums obviously
> > arise, not only in computer code but in print. I once figured out how
> > to make Pascal let me have it both ways by declaring both types, one
> > type indexed 0..NN-1 and the other 1..NN, and then I set a pointer of
> > one type to an array originally declared with another type. I'm
> > guessing that Ada doesn't allow this, however.
>
> No pointers needed:
>
> A : Vector (0 .. N - 1);
> B : Vector (1 .. A'Length);
>
> A := B;
> B := A;
>
> This is called sliding.
>
Good point. However, it uses twice the memory, and worse, changes made
in A are not reflected in B without repeating the assignment A := B
(correct?) and vice versa. My Pascal trick had neither of these
problems yet carried boundary checking using either name.
Maybe there's a way to do this using unrestricted_access variables of
GNAT.
Jerry
next prev parent reply other threads:[~2007-02-08 10:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2007-02-07 4:39 Why does this work? (overloads) Jerry
2007-02-07 6:45 ` AW: " Grein, Christoph (Fa. ESG)
2007-02-07 7:07 ` Jerry
2007-02-07 7:26 ` AW: " Grein, Christoph (Fa. ESG)
2007-02-07 20:43 ` Jerry
2007-02-07 19:09 ` AW: " Jeffrey R. Carter
2007-02-07 21:13 ` Jerry
2007-02-07 21:33 ` Ludovic Brenta
2007-02-07 21:36 ` Randy Brukardt
2007-02-07 19:02 ` Jeffrey R. Carter
2007-02-07 19:21 ` Adam Beneschan
2007-02-07 19:25 ` Adam Beneschan
2007-02-08 0:51 ` Jeffrey R. Carter
2007-02-07 23:12 ` Robert A Duff
2007-02-08 0:49 ` Jeffrey R. Carter
2007-02-07 20:53 ` Jerry
2007-02-08 0:53 ` Jeffrey R. Carter
2007-02-08 10:40 ` Jerry [this message]
2007-02-08 11:34 ` Georg Bauhaus
2007-02-08 12:05 ` AW: " Grein, Christoph (Fa. ESG)
2007-02-08 18:52 ` Jeffrey R. Carter
2007-02-09 0:56 ` Jerry
2007-02-09 1:27 ` tmoran
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