MathGroup Archive 2008

[Date Index] [Thread Index] [Author Index]

Search the Archive

Re: Need Help

  • To: mathgroup at smc.vnet.net
  • Subject: [mg94723] Re: Need Help
  • From: "Oyedeji, Kale" <koyedeji at morehouse.edu>
  • Date: Sun, 21 Dec 2008 05:54:36 -0500 (EST)
  • References: <200812181222.HAA00451@smc.vnet.net> <gig3m7$2ee$1@smc.vnet.net> <494C8A9F.5090306@gmail.com> <ABF3F07B6A901F45AB87EDCFF9CE073701321774@MCEXCLUSTER01.win.morehouse.edu> <op.umgt58zwtgfoz2@bobbys-imac.local>

For a novice like me, it will help if Bobby tells me the source of the
error.

Thanks.

'Kale

-----Original Message-----
From: DrMajorBob [mailto:btreat1 at austin.rr.com]
Sent: 20 December 2008 09:50
To: Oyedeji, Kale; Jean-Marc Gulliet; mathgroup at smc.vnet.net
Cc: dh; Bill Rowe
Subject: [mg94723] Re: Need Help

Wrong. That's NOT the source of the error, and the semicolon has ZERO 
effect there.

Bobby

On Sat, 20 Dec 2008 00:50:24 -0600, Oyedeji, Kale
<koyedeji at morehouse.edu> 
wrote:

> I thank Jean-Marc, Daniel, Bob, and Bill for all your assistance. All

> your suggestions worked perfectly. It  took me a while to see the
source 
> of the error was in not placing a semi-colon before the comma in R[k +

> 1] = f*S[k]*R[k];,
>
> Thank you all for your time.
>
> 'Kale
>
> -----Original Message-----
> From: Jean-Marc Gulliet [mailto:jeanmarc.gulliet at gmail.com]
> Sent: Saturday, December 20, 2008 1:03 AM
> To: Oyedeji, Kale; mathgroup at smc.vnet.net
> Subject: Re: Need Help
>
> Oyedeji, Kale wrote:
>
>> Bill, thanks for your comment. I have two iterative implicit
functions
>> S[k] and R[k] for which I plotted these functions versus k. But now
>> wants to see the effect of including a random function in the
expression
>> for S[k]. Daniel made suggestion that seem to work except that I was
>> getting  some error message from his suggestion shown below. The
error
>> message is Do::itform: Argument R[k+1]=f S[k] R[k] at position 2 =
does
>> not have the correct form for an iterator. >>. Will someone please
help
>> out. I spent hours in the Help pages of Mathematica, ver 6 without
>> success. I am afraid to load ver 7 as of now.
>
> <snip>
>
> Kale,
>
> I have tried the code you posted and haven't get any error or warning
> messages (Mathematica 6.0.3 on 64-bit Mac OS X 10.5.6). However, both
> sequences converge swiftly towards zero.
>
> B = 8.;
>
> f = 3. 10^-5;
>
> n = 10;
>
> S[0] = 3400;
>
> R[0] = 9;
>
> Do[S[k + 1] = R[k]*B Random[] - f*S[k]*R[k];
>   R[k + 1] = f*S[k]*R[k];, {k, 0, 10}]
>
> ?S
>
> Global`S
>
> S[0]=3400
>
> S[1]=50.7733
>
> S[2]=3.17097
>
> S[3]=0.00512872
>
> S[4]=7.01914*10^-7
>
> S[5]=1.56343*10^-13
>
> S[6]=1.15181*10^-24
>
> S[7]=5.86043*10^-42
>
> S[8]=9.93852*10^-71
>
> S[9]=3.9327*10^-116
>
> S[10]=1.48464*10^-190
>
> S[11]=7.525530556855338*10^-311
>
>
> ?R
>
> Global`R
>
> R[0]=9
>
> R[1]=0.918
>
> R[2]=0.0013983
>
> R[3]=1.33019*10^-7
>
> R[4]=2.04665*10^-14
>
> R[5]=4.30971*10^-25
>
> R[6]=2.02138*10^-42
>
> R[7]=6.98472*10^-71
>
> R[8]=1.228*10^-116
>
> R[9]=3.66136*10^-191
>
> R[10]=4.319715040784381*10^-311
>
> R[11]=1.923966547814739*10^-505
>
>
> Regards,
> -- Jean-Marc



--
DrMajorBob at longhorns.com


  • References:
  • Prev by Date: Re: Decimals from the "Get Coordinates" Tool
  • Next by Date: Re: Decimals from the "Get Coordinates" Tool
  • Previous by thread: Re: Need Help
  • Next by thread: Re: Need Help