From: "David C. Hoos, Sr." <david.c.hoos.sr@ada95.com>
Subject: Re: Calculating SQRT in Ada
Date: 1999/03/26
Date: 1999-03-26T00:00:00+00:00 [thread overview]
Message-ID: <FgzqKX3d#GA.202@pet.hiwaay.net> (raw)
In-Reply-To: 19990325232830.01123.00000079@ngol02.aol.com
John Herro wrote in message
<19990325232830.01123.00000079@ngol02.aol.com>...
>Robert Dewar said:
>> The proper way for testing for convergence is to see if
>> the new guess is the same as the last guess!
>
>Hans Marqvardsen said:
>>> while X /= 0.0 and then
>>> abs(Guess*Guess/X - 1.0) > 3.0*Dummy'Epsilon loop
>> Where does the multiplier 3.0 come from?
>
>There are some cases where the loop will alternate between two guesses, so
>testing that the new guess is the same as the last guess won't guarantee
>convergence with every implementation. However, it might be possible to
>terminate when the guess is the same as EITHER the last guess OR the
>second-to-last guess. I can't prove to myself that the loop would always
>terminate in this case, but it seems likely that it will.
>
John -- Did you look at my convergence test? It always works.
next prev parent reply other threads:[~1999-03-26 0:00 UTC|newest]
Thread overview: 55+ messages / expand[flat|nested] mbox.gz Atom feed top
1999-03-24 0:00 Calculating SQRT in ADA cmcrae
1999-03-23 0:00 ` Chris Morgan
[not found] ` <36F913E0.75F51763@lmco.com>
1999-03-24 0:00 ` John Herro
1999-03-24 0:00 ` Hans Marqvardsen
[not found] ` <36FAA3DF.42C31CF@lmco.com>
1999-03-26 0:00 ` Tom Moran
1999-03-25 0:00 ` robert_dewar
1999-03-25 0:00 ` John Herro
1999-03-24 0:00 ` Hans Marqvardsen
1999-03-25 0:00 ` David C. Hoos, Sr.
1999-03-25 0:00 ` robert_dewar
1999-03-25 0:00 ` David C. Hoos, Sr.
1999-03-26 0:00 ` Howard W. LUDWIG
1999-03-26 0:00 ` Ole-Hjalmar Kristensen
1999-03-27 0:00 ` robert_dewar
1999-03-29 0:00 ` Robert I. Eachus
1999-03-30 0:00 ` robert_dewar
1999-04-02 0:00 ` Robert I. Eachus
1999-03-30 0:00 ` robert_dewar
1999-04-02 0:00 ` Robert I. Eachus
1999-04-03 0:00 ` robert_dewar
1999-03-25 0:00 ` robert_dewar
1999-03-26 0:00 ` Calculating SQRT in Ada John Herro
1999-03-26 0:00 ` David C. Hoos, Sr. [this message]
1999-03-26 0:00 ` John Herro
1999-03-25 0:00 ` Calculating SQRT in ADA robert_dewar
1999-03-24 0:00 ` Ada 83 - Sometimes still chosen Richard D Riehle
1999-03-25 0:00 ` robert_dewar
1999-03-25 0:00 ` Richard D Riehle
1999-03-25 0:00 ` Larry Kilgallen
1999-03-26 0:00 ` robert_dewar
1999-03-26 0:00 ` Tom Moran
1999-03-26 0:00 ` Richard D Riehle
1999-03-26 0:00 ` Tom Moran
1999-03-26 0:00 ` Larry Kilgallen
1999-03-29 0:00 ` Marin David Condic
1999-03-29 0:00 ` Tarjei Tj�stheim Jensen
1999-03-27 0:00 ` Matthew Heaney
1999-03-26 0:00 ` Tarjei Tj�stheim Jensen
1999-03-27 0:00 ` robert_dewar
1999-03-27 0:00 ` Tarjei Tj�stheim Jensen
1999-03-25 0:00 ` robert_dewar
1999-03-25 0:00 ` Richard D Riehle
1999-03-25 0:00 ` Marin David Condic
1999-03-26 0:00 ` robert_dewar
1999-03-25 0:00 ` Calculating SQRT in ADA robert_dewar
1999-03-24 0:00 ` Howard W. LUDWIG
1999-03-25 0:00 ` Larry Kilgallen
1999-03-24 0:00 ` Marin David Condic
1999-03-24 0:00 ` bob
1999-03-24 0:00 ` Niklas Holsti
1999-03-26 0:00 ` bob
1999-03-26 0:00 ` als0045
1999-03-26 0:00 ` als0045
1999-03-26 0:00 ` Marin David Condic
1999-03-26 0:00 ` David C. Hoos, Sr.
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