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`Collect' with complex numbers??

• To: mathgroup@smc.vnet.net
• Subject: [mg12320] `Collect' with complex numbers??
• From: Craig P Earls <cearls@ix.netcom.com>
• Date: Thu, 7 May 1998 18:52:06 -0400
• Organization: Netcom

I couldn't figure out how to do an annoyingly straightforward
transformation with crtesian complex numbers:

Collect[(a+b)c +b d,b]

yields

a c + b(c+d)

Which is good, but

Collect[(a+i)b + c I , I]

yields

(a+I)b +c I

How can I do complex algebra when I can't get this transformation? Using
ComplexExpand and Re is less than satisfying.

-- 
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Craig P Earls, LT U.S. Navy                      cearls@ix.netcom.com
MIT Naval Construction and Engineering           cpearls@mit.edu
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• Follow-Ups:
  • Re: `Collect' with complex numbers??
    • From: Daniel Lichtblau <danl@wolfram.com>