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Jul 12th, 2005

Creating Amplitude in C++.net

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Hi!

I am new to this, and new to the programming. To be honest, it's not easy.

I am having this problem with doing Complex numbers. Basically, I have to write a program to show the Amplitude and Phase of a Complex object. First, because Amplitudes are usually absolute values, how do you write a absolute value equation in C++.net? Also, how do you show the phase?

Also, if anyone out there is a college student, or was a college student, maybe there is a better way to absorb this material. I read the book, but it tends to be too technical to understand. Anyone got any suggestions?

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paladin4service

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Jul 12th, 2005

Re: Creating Amplitude in C++.net

From what I've read on Wikipedia, it looks like you want the magnitude and the argument of a complex number. Suppose the real part is stored in re and the imaginary part is stored in im (both doubles, presumably). Then

C++ Syntax (Toggle Plain Text)
    double amplitude = sqrt( re * re + im * im);
    double phase = atan2( re, im);
    double amplitude = sqrt( re * re + im * im);
    double phase = atan2( re, im);

Amplitude is the absolute value in the sense that it is the distance of the complex number from the origin.

What book is this?

Rashakil Fol

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Jul 12th, 2005

Re: Creating Amplitude in C++.net

If you are coding in c++, The standard library provides a template class for complex numbers.

C++ Syntax (Toggle Plain Text)
#include <complex>
 
...
 
complex<double> z1( 2.7, 3.4);
 
double phase=arg(z1);
double magnitude=abs(z1);
#include <complex>

...

complex<double> z1( 2.7, 3.4);

double phase=arg(z1);
double magnitude=abs(z1);

CrazyDieter

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Jul 12th, 2005

Re: Creating Amplitude in C++.net

Amplitude is the absolute value in the sense that it is the distance of the complex number from the origin.

What book is this?[/QUOTE]

The book we are using in class is called Visual C++.net by DEITEL. I think the book is ok, but it is hard to understand, maybe considering that I am not a programmer. Thanks for the assistance!!!

paladin4service

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