Return-Path: X-Original-To: apmail-commons-user-archive@www.apache.org Delivered-To: apmail-commons-user-archive@www.apache.org Received: from mail.apache.org (hermes.apache.org [140.211.11.3]) by minotaur.apache.org (Postfix) with SMTP id 1B657EA00 for ; Wed, 21 Nov 2012 08:22:50 +0000 (UTC) Received: (qmail 2931 invoked by uid 500); 21 Nov 2012 08:22:49 -0000 Delivered-To: apmail-commons-user-archive@commons.apache.org Received: (qmail 2247 invoked by uid 500); 21 Nov 2012 08:22:43 -0000 Mailing-List: contact user-help@commons.apache.org; run by ezmlm Precedence: bulk List-Help: List-Unsubscribe: List-Post: List-Id: Reply-To: "Commons Users List" Delivered-To: mailing list user@commons.apache.org Received: (qmail 2227 invoked by uid 99); 21 Nov 2012 08:22:43 -0000 Received: from athena.apache.org (HELO athena.apache.org) (140.211.11.136) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 21 Nov 2012 08:22:43 +0000 X-ASF-Spam-Status: No, hits=-2.8 required=5.0 tests=HTML_MESSAGE,RCVD_IN_DNSWL_HI,SPF_PASS X-Spam-Check-By: apache.org Received-SPF: pass (athena.apache.org: local policy) Received: from [192.93.158.29] (HELO thsbbfxrt02p.thalesgroup.com) (192.93.158.29) by apache.org (qpsmtpd/0.29) with ESMTP; Wed, 21 Nov 2012 08:22:36 +0000 Received: from thsbbfxrt02p.thalesgroup.com (localhost.localdomain [127.0.0.1]) by localhost (Postfix) with SMTP id 9965637A7A8 for ; Wed, 21 Nov 2012 09:22:15 +0100 (CET) From: BIGNON Emmanuel To: "user@commons.apache.org" Date: Wed, 21 Nov 2012 09:20:07 +0100 Subject: [Commons-Math] RungeKuttaIntegrator first step too large Thread-Topic: [Commons-Math] RungeKuttaIntegrator first step too large Thread-Index: Ac3HwU0y1aEhp/qfT+6MeCdNCBI7pA== Message-ID: <3467_1353486135_50AC8F37_3467_11514_1_50AC8EB7.8020208@thalesgroup.com> Accept-Language: fr-FR X-MS-Has-Attach: X-MS-TNEF-Correlator: user-agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:9.0) Gecko/20111222 Thunderbird/9.0.1 acceptlanguage: fr-FR x-pmwin-version: 3.1.0.0, Antivirus-Engine: 3.37.2, Antivirus-Data: 4.83G Content-Type: multipart/alternative; boundary="_000_50AC8EB78020208thalesgroupcom_" MIME-Version: 1.0 X-Virus-Checked: Checked by ClamAV on apache.org --_000_50AC8EB78020208thalesgroupcom_ Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hello, I tried to integrate some equations using the RungeKuttaIntegrator class wi= th an ending time within the first step. And it seems Commons Math does not= adapt the first step size to match the ending time (It does it for next st= eps). I also noticed that this problem has been solved in issue MATH-727 for Embe= dded Runge Kutta integrators (which has an adaptive step size). Did I miss something or is that normal that the Embedded Runge Kutta integr= ators performs the step size check on first step but the Runge Kutta Integr= ator does not? Thanks for your time, Emmanuel --_000_50AC8EB78020208thalesgroupcom_--