Re: Computing Complex Series Solution using Mathematica
- To: mathgroup at smc.vnet.net
- Subject: [mg54684] Re: Computing Complex Series Solution using Mathematica
- From: Paul Abbott <paul at physics.uwa.edu.au>
- Date: Sun, 27 Feb 2005 01:29:08 -0500 (EST)
- Organization: The University of Western Australia
- References: <cvhiv9$s5r$1@smc.vnet.net>
- Sender: owner-wri-mathgroup at wolfram.com
In article <cvhiv9$s5r$1 at smc.vnet.net>, Pratik Desai <pdesai1 at umbc.edu>
wrote:
> Hello All,
>
> I am trying to check the convergence or lack there of a complex series
>
> Sinh[lamda*x]
>
> where the first six lamda are given as
> lamda={-0.331+3.162*I,-0.435+6.234*I,-0.093+9.418*I,-0.203+12.566*I,-0.365+15.
> 669*I};
> x=Range[0,1,0.1];
>
> I want to do more efficiently the following:
>
> s4=Sinh[lamda[[1]]*x]+Sinh[lamda[[2]]*x]+Sinh[lamda[[3]]*x]+Sinh[lamda[[4]]*x]
Use Map and Total:
lamda={-0.331+3.162*I,-0.435+6.234*I,-0.093+9.418*I,
-0.203+12.566*I,-0.365+15.669*I};
x=Range[0,1,0.1];
Total[Sinh[# x] & /@ lamda]
You have 5 values in lamda. Do you really want to omit the last value as
you have done in computing s4? If so then use
Total[Sinh[# x] & /@ Most[lamda]]
I also note that the imaginary part of lamda is quite close to n Pi and
that Sinh[x + I n Pi] simplfies.
Cheers,
Paul
--
Paul Abbott Phone: +61 8 6488 2734
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