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Re: READ_ASCII - accessing data from structures [message #39366]

Wed, 12 May 2004 13:25

JD Smith
Messages: 850
Registered: December 1999

Senior Member

On Wed, 12 May 2004 11:44:09 -0600, David Fanning wrote:

> Martin Doyle writes:
>
>> I wonder if anyone might be able to help me with this?
>>
>> I'm using the IDL READ_ASCII function to read in a semicolon seperated
>> file, after which I'd like to access individual elements of that data
>> file. From the RSI website, I see that I can access the data fields
>> (i.e. each column of data) by using, for example;
>>
>> print, mydata.(4)
>>
>> using the Variable_Name.(Tag_Index) method.
>>
>> Could someone tell me how to get to the individual elements of
>> mydata.(4)?? Using the above I can only get a large stream of numbers,
>> I need to use them one by one.
>
> Well, this should work:
>
> Print, (mydata.(4))[5]

Just wanted to point out that mydata[5].(4) will typically be quicker
if the mydata vector is quite long, and also requires fewer
parentheses. Your method first creates a (potentially long) vector,
and then subscripts it.

JD

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[Message index]

		Re: READ_ASCII - accessing data from structures By: JD Smith on Wed, 12 May 2004 13:25
		Re: READ_ASCII - accessing data from structures By: David Fanning on Wed, 12 May 2004 10:44

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