MathGroup Archive: September 2000 [00219]

[Date Index] [Thread Index] [Author Index]

Testing the Head of List Elements

To: mathgroup at smc.vnet.net
Subject: [mg25200] Testing the Head of List Elements
From: "Marshall Bartlett" <mgb_news at hotmail.com>
Date: Fri, 15 Sep 2000 02:21:40 -0400 (EDT)
Organization: University of Utah
Sender: owner-wri-mathgroup at wolfram.com

I'm something of a newbie with Mathematica; please excuse my ignorance.

I am looking for a clever way to select elements from a list based on their
type (Head).  Specifically, I want to extract all the elements of type
dtring from a list of elements of different types (string, number,
character, etc.).

Any suggestions?

--
--------------------------------------------------------------
Marshall Bartlett
Department of Geology and Geophysics
University of Utah
mgb_news at hotmail.com
--------------------------------------------------------------

Follow-Ups:
- Re: Testing the Head of List Elements
  - From: Ken Levasseur <Kenneth_Levasseur@uml.edu>

Prev by Date: Re: direction fields for diff eqns in mathematica 3.0?

Next by Date: How to display the desired numerical precision?

Previous by thread: HTML

Next by thread: Re: Testing the Head of List Elements