Re: more plotting peculiarities

*To*: mathgroup at smc.vnet.net*Subject*: [mg124098] Re: [mg124075] more plotting peculiarities*From*: Murray Eisenberg <murray at math.umass.edu>*Date*: Mon, 9 Jan 2012 03:14:41 -0500 (EST)*Delivered-to*: l-mathgroup@mail-archive0.wolfram.com*References*: <201201080922.EAA01272@smc.vnet.net>*Reply-to*: murray at math.umass.edu

Those results are wholly unsurprising (Version 8). After all, look at some sampled values in the domains, e.g.: 1.0 + 2.0^-47 Range[-5, 5, .1] // NumberForm[#, 15] & 1.02 + 2.0^-47 Range[-5, 5, .1] // NumberForm[#, 15] & And then take Cos of each list. Actually, the plot from the first expression does NOT look empty to me: I see a thickened horizontal axis located at height y = 0.54. Using option AxesOrigin -> {0,0} reveals what appears to be a line at that height. And the plot from the second is essentially a linearization, given that its range is from around 0.523365951251619 to 0.52336595125168. On 1/8/12 4:22 AM, Richard Fateman wrote: > Plot[Cos[1.0 + n*2.0^-47], {n, -5, 5}] looks empty > > Plot[Cos[1.02 + n*2.0^-47], {n, -5, 5}] > looks like a straight line with slope about -1 > > version 7 > -- Murray Eisenberg murray at math.umass.edu Mathematics & Statistics Dept. Lederle Graduate Research Tower phone 413 549-1020 (H) University of Massachusetts 413 545-2859 (W) 710 North Pleasant Street fax 413 545-1801 Amherst, MA 01003-9305

**References**:**more plotting peculiarities***From:*Richard Fateman <fateman@cs.berkeley.edu>