Possible Mathematica 4.0 bug
- To: mathgroup at smc.vnet.net
- Subject: [mg30786] Possible Mathematica 4.0 bug
- From: Christian Mikkelsen <chr_mikkelsen at yahoo.com>
- Date: Wed, 19 Sep 2001 00:16:25 -0400 (EDT)
- Sender: owner-wri-mathgroup at wolfram.com
The following problem cost most of a mornings work and I ended up attributing it to a bug but before I send it off to Wolfram Research I'd like some comments. I have a polynomial defined as H[z_]= (1/z^6) ((0.17897972007618376+0.1832666067995157 I)((0.07806788263644916+0.9898486037537829 I)+I z)((-1.0304811754750547-1.1012670896195078 I)+z)((-0.4716966687204682-0.6843778680006037 I)+z)((-0.4537703518350889+0.7354674436955 I)+z)((-0.32047121654063226+0.18872779388498095 I)+z)((0.7411819790476893+0.15538114678579676 I)+z)); with some auxiliary definitions f[w_] = Arg[H[Exp[I w]]]; fmm[w_] = (f[w+h]-2f[w]+f[w-h])/h^2 /.h->10^(-6) // Simplify; d = 1 10^8; The following results in an erroneous(?) simplification disp[l_]=fmm[d/l] //Simplify but defining d = 1.0 10^8 gives the correct(?) result. A different result at any rate. Ok, so in principle I have a workaround but I would be happy to know if the issue also exists in version 4.1. I don't currently have access to 4.1 but I am working on that. Finally, it is of course possible that I have missed something so I would be most happy to get feedback on that as well. Cheers, Christian Mikkelsen ______________________________________________________ Hold styr på vennerne, familien eller studiegruppen med Yahoo! Grupper. Du finder dem på www.yahoo.dk/grupper Yahoo! Grupper - et sjovt og praktisk forum for interessefællesskaber.