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Re: Complex -> List does not work

• To: mathgroup@smc.vnet.net
• Subject: [mg10691] Re: Complex -> List does not work
• From: Allan Hayes <hay@haystack.demon.co.uk>
• Date: Fri, 30 Jan 1998 04:24:28 -0500
• References: <6ak4jr$2ub$2@dragonfly.wolfram.com>

David

> One of the basic principles of replacement rules is that replacements
> are not made inside of atomic expressions.
> ...........
> When you enter 2 + 3 I, or Complex[2, 3], the input is a normal expression, 
> not an atom.
> The corresponding atomic complex number is constructed only when these
> inputs are evaluated.

How about the following

In[1]:=
Complex[2,3]/.Complex[x_,y_]->List[x,y]

Out[1]=
{2, 3}


and 

In[43]:=
Complex[2,3]

Out[2]=
2 + 3 I

In[3]:=
%/.Complex[x_,y_]->List[x,y]

Out[3]=
{2, 3}


-- 
Allan Hayes
Training and Consulting
Leicester, UK
hay@haystack.demon.co.uk
http://www.haystack.demon.co.uk
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