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Re: Extracting info from the ASCII file with IDL [message #73587 is a reply to message #73586]

Thu, 18 November 2010 08:40

Gray
Messages: 253
Registered: February 2010

Senior Member

On Nov 18, 10:38 am, Sasha Singh <sashasingh....@gmail.com> wrote:
> Hi,
> I have a ASCII text file whose entries look like this
>
> 111 AA 25 XX
> 111 AB -5 XX
> 222 AC 25 XX
> 222 AD 20 XX
> 222 AE 21 XX
> 333 AF 88 XX
> 444 AG 21 XX
> 444 AH 90 XX
> and so on.....
> In this file the first column represents a unique number refering to
> an experiment. Any particular experiment
> was repeated a random number of times, such as experiment 111 was
> repeated twice, experiment 222 was
> repeated 3 times, experiment 333 was done only once. I need to know
> how many unique experiments were done.
> To clarify it further, in above example 4 experiments (111, 222, 333
> and 444) were done. I need to know this in a file which has 1300 rows.
> Please help.

Use READCOL from the NASA IDL astronomy library to read the first
column. Then do n_elements(uniq(data,sort(data))).

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		Re: Extracting info from the ASCII file with IDL By: penteado on Thu, 18 November 2010 08:55
		Re: Extracting info from the ASCII file with IDL By: Kenneth P. Bowman on Thu, 18 November 2010 08:27
		Re: Extracting info from the ASCII file with IDL By: Gray on Thu, 18 November 2010 08:40

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