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Re: Sum of terms --> list

  • To: mathgroup at smc.vnet.net
  • Subject: [mg110664] Re: Sum of terms --> list
  • From: "Nasser M. Abbasi" <nma at 12000.org>
  • Date: Thu, 1 Jul 2010 08:27:01 -0400 (EDT)
  • References: <i073se$koe$1@smc.vnet.net> <i0cjj9$878$1@smc.vnet.net>
  • Reply-to: nma at 12000.org

On 6/29/2010 3:57 AM, Richard Fateman wrote:
> If you want to send a Mathematica expression that is already parsed, use
>      FullForm.
> Even {a,b,c}  needs to have some parsing, and a FullForm expression
> needs very little more.
>
>
> While List@@(a+b I)  gives {a, I*b},
>
> note that List@@(3+ 4 I) does not give {3, I*4}.
>
> This is supposed to be a feature.
>

it seems in the second case, this happens becuase the expression was 
evaluated first? By holding evaluation, one can get the same result as 
in the first case:

List @@ (a + b*I)
{a, I*b}

List @@ (3 + 4*I)
3 + 4*I

ReleaseHold@(List @@ (3 + Hold@4*I))
{3,4 I}


--Nasser


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