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Re: Please Help Eliminate My Ignorance

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  Re: Please Help Eliminate My Ignorance Tomas Garza <tgarza10@msn.com> - 2011-05-03 09:45 +0000

#2049 — Re: Please Help Eliminate My Ignorance

Mathematica finds no problem with 1. You are just defining the function test (only if you try to evaluate iyou=B4ll be in trouble, since there is no p). The problem in 2. arises because you have just Clear'ed p, and so Append[p, p[[4]]] makes no sense: there is no p.
-Tomas

> Date: Mon, 2 May 2011 06:52:02 -0400
> From: mmandelberg@comcast.net
> Subject:  Please Help Eliminate My Ignorance
> To: mathgroup@smc.vnet.net
>
> Why does Mathematica like the first, but not the second?
>
> 1.
> Clear[x, testp, p];
> test[p_] :=  Append[p, p[[4]]];
>
>
> 2.
> Clear[x, testp, p];
> test[p_] := x = 1; Append[p, p[[4]]];
>
> Part::partd: Part specification p[[4]] is longer than depth of object.
> >>
>
> Append::normal: Nonatomic expression expected at position 1 in
> Append[p,p[[4]]]. >>
>

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