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Re: ReplaceAll

  • To: mathgroup at smc.vnet.net
  • Subject: [mg90410] Re: ReplaceAll
  • From: dh <dh at metrohm.ch>
  • Date: Tue, 8 Jul 2008 07:48:35 -0400 (EDT)
  • References: <g4v2u3$idv$1@smc.vnet.net>


Hi Bruce,

note that M=b**a'+a**b' works as expected. Then look at:

(-a ** bp) // FullForm

and you see that ** binds stronger than Times. Therefore, a pattern 

that works for "-a" as well as "a" reads:

Optional[c1_Integer]c2_** b'**b**c3_->c1 c2** x **c3

hope this helps, Daniel





Bruce Colletti wrote:

> Re Mathematica 6.0.2 under WinXP.

> 

> Why doesn't the following substitute x for b'**b (appears in the third, fourth, sixth and seventh summands)?  (a**b')**b/.b'**b->x does.

> 

> Thankx.

> 

> Bruce

> 

> In[1]:= M=b**a'-a**b';

> Distribute[M**M**M,Plus]/.b'**b->x

> 

> Out[2]= (-a**b^\[Prime])**(-a**b^\[Prime])**(-a**b^\[Prime])+b**a^\[Prime]**(-a**b^\[Prime])**(-a**b^\[Prime])+(-a**b^\[Prime])**b**a^\[Prime]**(-a**b^\[Prime])+(-a**b^\[Prime])**(-a**b^\[Prime])**b**a^\[Prime]+b**a^\[Prime]**b**a^\[Prime]**(-a**b^\[Prime])+b**a^\[Prime]**(-a**b^\[Prime])**b**a^\[Prime]+(-a**b^\[Prime])**b**a^\[Prime]**b**a^\[Prime]+b**a^\[Prime]**b**a^\[Prime]**b**a^\[Prime]

> 

> 





-- 



Daniel Huber

Metrohm Ltd.

Oberdorfstr. 68

CH-9100 Herisau

Tel. +41 71 353 8585, Fax +41 71 353 8907

E-Mail:<mailto:dh at metrohm.com>

Internet:<http://www.metrohm.com>




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