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MathGroup Archive 1998

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RE: Adding equations

  • To: mathgroup at
  • Subject: [mg14390] RE: [mg14342] Adding equations
  • From: Daniel CLEMENT <dclement at>
  • Date: Sun, 18 Oct 1998 15:09:56 -0400
  • Sender: owner-wri-mathgroup at

does what you want.
You must instruct Thread to work with Equal; I think it is because Equal
does not have the attribute 'Listable'. Look for the help on Thread; 
there is an example very similar to yours. Of course, you can replace
Plus with Times or various other functions.


> ----- Original Message -----
> From:	Lawrence Walker [SMTP:lwalker701 at]
To: mathgroup at
> Sent:	Thursday, October 15, 1998, 6:28:46
> To:	mathgroup at
> Subject:	[mg14342] Adding equations
> Group:
> I've been trying to add two equations as follows:
> In[4]:>     aû;
> In[5]:>     cý;
> In[6]:>     %4+%5
> Out[6]>     (aû)+(cý)
> The result I was looking for is (a+c)ÿb+d). The following works 
but it
> seems clumsy. In[7]:>     %4[[1]]+%5[[1]]ÿ4[[2]]+%5[[2]] Out[7]>     a+cû+d
> Is there a way to elegantly add (sub, mult, div) two equations?  Also 
> there an elegant way to add (sub, mult, div) an expression to both
> sides of an equation?
> Lawrence Walker
> ----- End Of Original Message -----

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