Path: csiph.com!3.us.feeder.erje.net!2.us.feeder.erje.net!feeder.erje.net!1.eu.feeder.erje.net!weretis.net!feeder4.news.weretis.net!feeder5.news.weretis.net!news.solani.org!.POSTED!not-for-mail From: Karl Ratzsch Newsgroups: comp.graphics.apps.gnuplot Subject: Re: What's new in gnuplot 5.2 Date: Fri, 2 Jun 2017 12:11:29 +0200 Organization: solani.org Lines: 5 Message-ID: References: <022e551d-f7c4-44a1-973b-f8db0375854b@googlegroups.com> Mime-Version: 1.0 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit X-Trace: solani.org 1496398289 5036 eJwFwQkRwEAIBDBLfEtBDscO/iU0gafmfpHIwOGemj3bSdGePPaWRRWF/daX4Fm0TdOVkPsBILsRWg== (2 Jun 2017 10:11:29 GMT) X-Complaints-To: abuse@news.solani.org NNTP-Posting-Date: Fri, 2 Jun 2017 10:11:29 +0000 (UTC) User-Agent: Mozilla/5.0 (Windows NT 6.1; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.1.1 Content-Language: de-DE-1901 In-Reply-To: <022e551d-f7c4-44a1-973b-f8db0375854b@googlegroups.com> X-User-ID: eJwFwYkRwDAIA7CVwgF2Mk55vP8IldJhaAYSkUrR6SrK+pONjY7wWOvRhTkb8yqb27V39uoHNSESkQ== Cancel-Lock: sha1:mx1iqUbQsXZbqQXs1/DtIs/s3gc= X-NNTP-Posting-Host: eJwVysEBwCAIA8CVipAg49Co+49g+7nXwWlUBsHAwfFumO0pyWzZHnw9fU2cVH5UPKUajmj+5QIdPBDN Xref: csiph.com comp.graphics.apps.gnuplot:3660 Am 02.06.2017 um 11:32 schrieb hugocoolens@gmail.com: > I understand the problem but even giving good starting values thus not always help. In fact I most of the time just want to have a parameter "b" strictly positive, I tried to circumvent Gnuplot making it negative by substituting it by an always positive exp(b), but this is not really an advisable practice and just being able to tell Gnuplot to keep it always positive would be great. Just out of curiosity, what is the function you try to fit?