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Re: Simplify complex equation

• To: mathgroup at smc.vnet.net
• Subject: [mg114447] Re: Simplify complex equation
• From: Herman Kuun <oomkoos1 at gmail.com>
• Date: Sat, 4 Dec 2010 06:16:34 -0500 (EST)

In

q1 = Iz;

There is no space between imaginary "I" and z

Best

On Fri, Dec 3, 2010 at 12:22 PM, mailcwc at gmail.com <mailcwc at gmail.com>wrote:

> I tried the following code which attend to extract the real and the
> imaginary part of q4.
> z, s, f, s2 are all real numbers.
> Why I get imaginary part in the first answer and zero in the 2nd
> answer?
>
>
> q1 = Iz;
> q2 = q1 + s;
> q3 = (q2 f)/(f - q2);
> q4 = q3 + s2;
> ComplexExpand[Re[q4]]
> ComplexExpand[Im[q4]]
>
> Out = s2 + (f s)/(f - s - Iz) + (f Iz)/(f - s - Iz)
>
> Out = 0
>
>