Re: Can it be done - easily?

*To*: mathgroup at smc.vnet.net*Subject*: [mg13257] Re: Can it be done - easily?*From*: "Clemens Frey" <clemens.frey at uni-bayreuth.de>*Date*: Fri, 17 Jul 1998 03:17:50 -0400*Organization*: University of Bayreuth, Department of Mathematics and Computer Science*References*: <6od25q$hn9@smc.vnet.net>*Sender*: owner-wri-mathgroup at wolfram.com

Barry Culhane wrote in message <6od25q$hn9 at smc.vnet.net>... >Myself and two workmates are software developers. One guy wanted a >formula to calculate a result for the following equation... > Z = sum of X/Y where X is a fixed number, and Y ranges from A-B in >fixed steps... > i.e... X=10000 ; Y=100,200,300...1000 > i.e... Z= 10000/100 + 10000/200 + ... 10000/1000 = 292.896 > ... Hi Barry, it can be done - easily. if you have a stepsize, a starting value, end value (all three defining y), and a factor x, you can instruct Mathematica to calculate f[x_,start_,end_,step_] := NSum[x/y,{y,start,end,step}]]; You can investigate the time consumed by this by, e.g. : Timing[ f[1,1,10^6,1] ] {0.05 Second, 14.3927} So: easy and fast... Clemens