Services & Resources / Wolfram Forums
-----
 /
MathGroup Archive
1996
*January
*February
*March
*April
*May
*June
*July
*August
*September
*October
*November
*December
*Archive Index
*Ask about this page
*Print this page
*Give us feedback
*Sign up for the Wolfram Insider

MathGroup Archive 1996

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

Search the Archive

Re: help! to input data...

  • To: mathgroup at smc.vnet.net
  • Subject: [mg4264] Re: help! to input data...
  • From: wagner at motel6.cs.colorado.edu (Dave Wagner)
  • Date: Sun, 23 Jun 1996 03:10:11 -0400
  • Organization: University of Colorado, Boulder
  • Sender: owner-wri-mathgroup at wolfram.com

In article <4q09hb$g8c at dragonfly.wolfram.com>,
Paul Abbott  <paul at earwax.pd.uwa.edu.au> wrote:
>Ian Collier wrote:
>
>> Mathematica's ReadList command does not have any built-in options to
>> read comma-separated data. 
>
>
>A not so neat alternative is:
>
>In[4]:= ReadList["comma.dat", Table[Word,{3}],  WordSeparators->","]
>

The not-so-neat alternative is required if the data has been output
by a spreadsheet program like excel, which does not represent zero-valued
entries in the file, e.g.,

	1,,3,4,5
	6,7,,,10

You need to use

	ReadList["comma.dat", Word, RecordLists->True,
		WordSeparators->","]

Note that the RecordLists option obviates the need to specify how
many items are on each line.  (In fact, the code shown works even when there
are a different number of items on each line.)

For the above data, you'll get something like this:

	{"1", "", "3",  etc.

When you convert this ToExpression, each "" will turn into Null, which
can easily be replaced with 0's using a rule.

		Dave Wagner
		Principia Consulting
		(303) 786-8371
		dbwagner at princon.com
		http://www.princon.com/princon

==== [MESSAGE SEPARATOR] ====


  • Prev by Date: Psfix on in Dos mathematica ??
  • Next by Date: Re: Help with this!!!! please
  • Previous by thread: Re: help! to input data...
  • Next by thread: Re: help! to input data...