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Topic: Re: help! to input data...
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Dave Wagner

Posts: 19
Registered: 12/7/04
Re: help! to input data...
Posted: Jun 18, 1996 3:05 AM
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In article <4q09hb$>,
Paul Abbott <> 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.,


You need to use

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

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

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