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Tue, 24 Nov 2015 16:00:37 +0000 Subject: Re: Multiprecision arithmetic To: References: From: Patrick Alken Message-ID: <565489A1.10604@colorado.edu> Date: Tue, 24 Nov 2015 16:00:00 -0000 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:38.0) Gecko/20100101 Thunderbird/38.3.0 MIME-Version: 1.0 In-Reply-To: Content-Type: text/plain; charset="windows-1252"; format=flowed Content-Transfer-Encoding: 7bit X-ClientProxiedBy: BLUPR14CA0053.namprd14.prod.outlook.com (25.163.209.149) To CY1PR0301MB0905.namprd03.prod.outlook.com (25.160.165.16) X-Microsoft-Exchange-Diagnostics: 1;CY1PR0301MB0905;2:Z4EkrkXfmIssb/ObxM4/s4Flw1twp060mwrkmMIDGVMNxc9emI3gtbD8sC+6InKMNVs0ukItSQFOOVSYIZ3PsjUKc2mhgUj81//bTUOO88cgOUQBwILDoFHdOluu2haFZN48ORgMGbMdJATy1/YJjg==;3:+YQOjyirsMvhh/ZARmMh+tEgciTNTr/bj8uviTh93wjyihHqlDchDiaPsFZr0VVICTqj1SatYyBGFpJZU/UqwD22ntOZ1Xem+9bSN3BasJIY9fteWFXKMLjBKytTXOBk;25:R5fN2UmcWNJS6hsbHGXeEfZFp0VtQ0MHu5ITEPTsX8BEP51J82uAmLi7cUhDd8hWSkBiJTSvaZrQxc08BWufAq3dNNkC52tmpumC30mftac2deuN6EEugqsk6xc5t8/A68aqNq5x2r4w4ZSYFCKGXLD5/ocJXsU/UWKG1Fn03zdqtzFn4/3YESrc03M13onFbA93DbLEdjUHviK6j7Ojp3+2sRzPB7U1zEma+meud5C3Rk+6GsaX0NMpxkcAboq6Mkx1G7W2zdpUDcwrLTgjUQ==;4:uHEQFv6SnqeMCuHalozOkbsE1q4KC3fN42d6XtkBqOQs/8JSlykZgYnKp2kzh9gY0yGZ6i5hz/cBCrdMiomKqNTy99imu+FSR3yXamSFYZNEHB7uLZJke9mV26NSpKVnKSX87XroYaCD+xDjaUCFxvQ3rDguGVRNN31RB7qv+lLWxxpdCUOHQhKtFHV+Dr49oU4LyPU1CTYGpWr3wp/ioYJjGz5PTdJDopoI9idWeuQNIDldJ2HqzESYKJ4EaIGV4ZY3qE0eSb5zXAB1R+hzenKyvLMp/jL17DklNyGpSZ8Mmn9ogw+faYhOnS8AnFZ5vcllsEe42Sa0YSlfPEy9/3Eo5B+yizoCTalYdoYsIDLrnpHe3IAtciQBGUMtI1+D X-Microsoft-Antispam: UriScan:;BCL:0;PCL:0;RULEID:;SRVR:CY1PR0301MB0905; 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Received-SPF: None (protection.outlook.com: colorado.edu does not designate permitted sender hosts) X-Microsoft-Exchange-Diagnostics: =?Windows-1252?Q?1;CY1PR0301MB0905;23:cD60oX29qdJ6mOqNPrDifEU1nBAZaGtaII9?= =?Windows-1252?Q?NycphBI6jC5925BDFKPgZcRVylQ5a+UvsAc3lq5t6ydCp3JfySI5SV+i?= =?Windows-1252?Q?cCHUo6ZT5fVcrjhLqjME4fvCFIJW6NSiD9obXF7s9YWIGQLfFKRB3SQy?= =?Windows-1252?Q?xhwAO6NA1L+4GD6/jqx4eDY2MzFO6VKxDMC2eiD9szerpnYX06EarRJu?= =?Windows-1252?Q?Qhq2yYuOZ4OFYN3hWBuun7ze98Huzfzf1ajPlSX/LTqBcvXb6XZhf3Ko?= =?Windows-1252?Q?fDt7D8xxRMWpm0tUACkufvr2U52UsoqH9p27O3WqrLL7cqR4b2dQlYSb?= =?Windows-1252?Q?0D6ye5ym92yxxG0+Qa2woe/zjqiYhVrhhXyc5fsKAccRM/irlg5919JF?= =?Windows-1252?Q?HZKN92R6gCoNNADEVdNxGlo4gS4nIjcBBg/fJCIPtEvg9IH42CExKqB3?= =?Windows-1252?Q?gGcSP+Aak2MaYA6B0hj0CIs85fqXNBDHeOU49X0Xu++Ey8Qwf/1hXPl7?= =?Windows-1252?Q?1Ub0LhDVJqUSs4q66ZyjhKeHpejPA5gr/hD2R+s9ls9/ePrwv2Ay5xgx?= =?Windows-1252?Q?T3sOUnxVlOA7Wc8ZeWJlS8M+uPqR6wtpfBtZZIl5b9/bPLNWwqMKC0IL?= =?Windows-1252?Q?S3GHDQBii/hlEDgYf1UIh0N4EyUl8/FqVl/bK48aLJJMhcSjYh8psda3?= =?Windows-1252?Q?QwATbiKDYC9VHJymFaZShWp961KlNPdcwewN/qYIOMgn7isF3q8eE2nA?= =?Windows-1252?Q?GMnb6DTMx34UUr4a2OOJGuItmipWWCo0tpVDAow0ZOzRjuCgQh7Kh0rx?= =?Windows-1252?Q?/ZxhuUJzdF6sTcOzhQnqWw1gM/bEUrzhaGu8RzsN2lVRhicc//WoX7f4?= =?Windows-1252?Q?QzbDNAtyHgK1RRut0FsN9Z+U8yVrk0NZAYYe5S/6MTkV17L2s9JXn5P2?= =?Windows-1252?Q?5c4Nl0CuQV3pluXecm7W1JgiFEUi83rBTVUXso2oi/GI+DhqAEqCl4R9?= =?Windows-1252?Q?cGexj0kGA82pus0TqKILbeosmjBnGBmIo3jSIVz05FMmxAxQP7tacrKh?= =?Windows-1252?Q?grrAtl055l41g0JwdbCKgeDJfOZH4ES1x37BFmpuATi3b6F2Om+DVZoI?= =?Windows-1252?Q?xoKoyiTdDELwNXwXt2wJn4rNFbblzGID9elw8uxgEMIBhgZyd3PwD3xr?= =?Windows-1252?Q?nGxFK3OZ6j02XW6CB0nFcvnTfxRvKmFFwkcg1YPyHYbqzUV9qZC1WpQA?= =?Windows-1252?Q?qKSPvT72vGEuMqvqiJ7IV1HVQD04yjgsCfkXRcqTkNclEznjGvn0uja6?= =?Windows-1252?Q?UXpzl62HjopXQjvbOnDzmPI0Kcmg/b6xYprnIIQ3hgEQAj/C77LD+iZR?= =?Windows-1252?Q?B0gTTs3BCajg3kj7QKBaarwBUVUvgOc9CcYqnwZXEVMXbCw0HwWtS0pM?= =?Windows-1252?Q?=3D?= X-Microsoft-Exchange-Diagnostics: 1;CY1PR0301MB0905;5:nCL2vIvqVAspMcDSw1o0F/wL0xN1kQK/ElgnXA22f048HxSbUB+SOzxpxvmdN4cgmvKKTeIaPQV/lHhE9cuYb86j2D3eutqnqWOIElrFenT0c+xucJuT7tCh890KRhniMbO3lJON6eaRpwaZaags3Q==;24:kmTXQXOGov+G0hRjn3+2uYLErd3nHmAB1/3bG8lcGa3ZFsBCUOhCbX+aUratmsrNkg4rSWo7aQq/LSiJ2fdjZ907aI4DuhBZ8LEFRwThSTI= SpamDiagnosticOutput: 1:23 SpamDiagnosticMetadata: NSPM X-OriginatorOrg: colorado.edu X-MS-Exchange-CrossTenant-OriginalArrivalTime: 24 Nov 2015 16:00:37.1238 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-Transport-CrossTenantHeadersStamped: CY1PR0301MB0905 X-SW-Source: 2015-q4/txt/msg00015.txt.bz2 Yes for now I think it would add too much complexity to GSL, so we prefer to use double precision. Thanks for your work on the recent bugs - I haven't had a chance to look at the patches but I'm hoping to get to this soon. Patrick On 11/24/2015 07:18 AM, Bill Maier wrote: > I notice than in the write-up for bug #45746 it is suggested that multiprecision > arithmetic be used in a portion of the calculation to produce a more precise > result. Is this something that would be considered in GSL? I did a search > through the code for mpfr or gmp and did not find either. In fact I couldn't find > any code where multiprecision arithmetic is currently being used. Is it GSL > policy to keep all internal calculations in double precision? > > -Bill Maier