From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (qmail 9722 invoked by alias); 2 Mar 2012 16:14:10 -0000 Received: (qmail 9660 invoked by uid 22791); 2 Mar 2012 16:14:05 -0000 X-SWARE-Spam-Status: No, hits=-0.4 required=5.0 tests=AWL,BAYES_00,T_RP_MATCHES_RCVD X-Spam-Check-By: sourceware.org Received: from ipmx3.colorado.edu (HELO ipmx3.colorado.edu) (128.138.128.233) by sourceware.org (qpsmtpd/0.43rc1) with ESMTP; Fri, 02 Mar 2012 16:13:51 +0000 X-IronPort-Anti-Spam-Filtered: true X-IronPort-Anti-Spam-Result: ApwEALDwUE/AqBGb/2dsb2JhbABDtUyCKxF9NAJMDQgBAYgCn2qXI4Efj2QEiFCgAw Received: from omr-raz-2-priv.int.colorado.edu ([192.168.17.155]) by ipmx3-priv.int.colorado.edu with ESMTP; 02 Mar 2012 09:13:50 -0700 Received: from bonanza.ngdc.noaa.gov (EHLO bonanza.ngdc.noaa.gov) ([140.172.179.41]) by omr-raz-2-priv.int.colorado.edu (MOS 4.1.10-GA FastPath queued) with ESMTP id DAP83962 (AUTH alken); Fri, 02 Mar 2012 09:13:50 -0700 (MST) Message-ID: <4F50F1BE.10603@colorado.edu> Date: Fri, 02 Mar 2012 16:14:00 -0000 From: Patrick Alken User-Agent: Mozilla/5.0 (X11; Linux i686 on x86_64; rv:10.0.2) Gecko/20120216 Thunderbird/10.0.2 MIME-Version: 1.0 To: "gsl-discuss@sourceware.org" Subject: odeiv2 request Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Mailing-List: contact gsl-discuss-help@sourceware.org; run by ezmlm Precedence: bulk List-Id: List-Subscribe: List-Archive: List-Post: List-Help: , Sender: gsl-discuss-owner@sourceware.org X-SW-Source: 2012-q1/txt/msg00017.txt.bz2 I had a problem recently where I needed to integrate forward along a curve (positive step size h) and then integrate backward again (negative h). But there is currently no way to change the sign of the step size h using the driver routines, so I had to modify driver->h directly. I propose adding a routine gsl_odeiv2_driver_set_h() to allow the user to reset the step size to what they want. Tuomo: do you see any negative issues with this? I can make the addition if you want. Thanks, Patrick