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