complex calculation in C#

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1.25/5 (3 votes)

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C#

I have a lot of calculation on complex numbers in C#.what can i do? is there idea for doing it?

Posted 17-Mar-11 9:25am

Member 7753662

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Dave Kreskowiak 17-Mar-11 15:40pm

Your question is very vague. But, I would probably start by creating a class that represents a complex number. Beyond that, it's impossible to answer a question that you never asked. What do you want to do with these complex numbers??

Member 7753662 17-Mar-11 16:36pm

tnx Dave
I want to integrating a complex function,such as exp(j*k*x).
(j^2=-1 !)

Dave Kreskowiak 17-Mar-11 18:22pm

That doesn't look like it has anything to do with complex numbers. Expression parsing and evaluation, yes. If you haven't done anything like that before, you've got a bunch of research to do. I suugest starting with "Reverse Polish Notation" and moving up from there.

Henry Minute 17-Mar-11 15:45pm

Further to Dave's comment, there is even a simple example in the C# Programming Guide --> http://msdn.microsoft.com/en-us/library/6fbs5e2h%28v=VS.90%29.aspx

apaka 17-Mar-11 15:56pm

Maybe you want something like this http://www.codeproject.com/KB/dotnet/complex_math.aspx

2 solutions

Solution 2

First of all: read this:

http://msdn.microsoft.com/en-us/magazine/cc163995.aspx[^]

The answer on complex numbers strongly depends on .NET Framework version. If you use v.4.0. you should use new name space System.Numerics: http://msdn.microsoft.com/en-us/library/system.numerics.aspx[^].

It introduces two new things: arbitrary-precision integer arithmetic (which is a great achievement!) and complex arithmetic.

—SA

Posted 18-Mar-11 9:10am

Sergey Alexandrovich Kryukov

Comments

Espen Harlinn 21-Mar-11 5:05am

Interesting MSDN article, 5!

Sergey Alexandrovich Kryukov 21-Mar-11 5:18am

Thank you. Did you try BigInteger? This is amazing code. And hard to get (as I remember I uses something like that in Python; and never knew it was available anywhere else; I don't count many libraries with unlimited precision but fixed at the moment of instantiation which is not interesting at all. It is easy to exhaust all the memory with just 2-3 operations with BigInteger)
--SA

Sergey Alexandrovich Kryukov 21-Mar-11 5:21am

And thank you for the vote!
--SA

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Espen Harlinn · Accepted Answer · 2011-03-17T10:27:00

Solution 1

I think you'll find that somebody has solved this problem before:
http://numerics.mathdotnet.com/[^] - the source code is available on codeplex[^]

Best regards
Espen Harlinn

Posted 17-Mar-11 10:27am

Espen Harlinn

Comments

Yusuf 17-Mar-11 16:37pm

I doubt he need that, but good link nonetheless. What he is perceiving it as complex, may not be complex at all. Some calculation as its best.

Espen Harlinn 17-Mar-11 17:33pm

Thank you Yusuf, Math.NET handles complex numbers - as I understood it, that's what he was asking for :)

Member 7753662 18-Mar-11 2:16am

tnx Espen.what's Math.NET and how can i use this?

Espen Harlinn 18-Mar-11 4:39am

Follow the links provided with my answer, download the library, and you'll find a number of examples - including how to work with complex numbers

Sergey Alexandrovich Kryukov 18-Mar-11 15:12pm

This is good, but my 4 this time. How could you forget new System.Numerics (v.4.0 only)?!
I also got another overview material. Please see my Answer.
--SA

Espen Harlinn 21-Mar-11 12:40pm

System.Numerics allows you to do "simple" math, while Math.Net provides the tools usually required to do something useful - I didn't forget it, just thought I should direct OP to something more comprehensive :)

Sergey Alexandrovich Kryukov 21-Mar-11 23:18pm

Understand, but I simply say System.Numerics should be mentioned in all cases.
--SA