Re: Precision and Rounding
- To: mathgroup at smc.vnet.net
- Subject: [mg33258] Re: Precision and Rounding
- From: Jens-Peer Kuska <kuska at informatik.uni-leipzig.de>
- Date: Tue, 12 Mar 2002 05:08:48 -0500 (EST)
- Organization: Universitaet Leipzig
- References: <a6e551$12m$1@smc.vnet.net>
- Reply-to: kuska at informatik.uni-leipzig.de
- Sender: owner-wri-mathgroup at wolfram.com
Hi, a) you can't cut down the precision, because your floating point hardware is used for the computation and a floating point register has a fixed length of 4 or 8 byte. Mathematica support only double 8 byte values and even if you need less bytes the value will be padded with zeros when it is transfered into the register. b) you mean a profiler. When I remember right, there was a article in "The Mathematica Journal" about a Mathematica profiler. But the code of it was never published and I don't think that it is available ... Regards Jens bradamanteus at yahoo.com wrote: > > There must be a simple answer to this: > > I'm producing a large output file that takes a long time to compute, and I > think this is partly because Mathematica always has my output as 14 decimal > places, and I don't need such accuracy. Is there a way to reduce calculation > time by reducing the precision of all calculations in my model. Rounding > with N doesn't work. > > Also, I'm told that I can reduce the time of my program by looking at a > debugging tool that tells me how long the program spends on certain parts of > my code. What is this? > > thanks > > Leanne Ussher