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Re: Rule replacement doesn't work after NDSolve?
- To: mathgroup at smc.vnet.net
- Subject: [mg124068] Re: Rule replacement doesn't work after NDSolve?
- From: Bill Rowe <readnews at sbcglobal.net>
- Date: Sat, 7 Jan 2012 05:26:03 -0500 (EST)
- Delivered-to: l-mathgroup@mail-archive0.wolfram.com
On 1/6/12 at 4:18 AM, g.crlsn at gmail.com (gac) wrote:
>I see that the FullForm[-2*I] is also not
>Times[Complex[-2,0],Complex[0,1]].
>So this won't work either:
>-2*I/.Complex[0,1]->Complex[0,-1]
>to replace only I with -I, we need to use parentheses:
>-2*(I/.I->-I)
No, it is not necessary to use parentheses. This works:
In[8]:= 2 I /. Complex[_, a_] -> -a I
Out[8]= -2 I
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