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Re: String Data file [message #35836]

Thu, 31 July 2003 23:57

R.Bauer
Messages: 1424
Registered: November 1998

Senior Member

Pavel Romashkin wrote:
> This code doesn't seem to work because the first field, a string, reads
> in the entire line and the numerical variables won't have anything to read:
>
> IDL> line = {col1:"a string", col2:0.0, col3:0.0}
> IDL> OPENR, lun, 'untitled.txt', /GET_LUN
> IDL> READF, lun, data
> % READF: Input conversion error. Unit: 100
> File: SCSI data:untitled.txt
> % Execution halted at: $MAIN$
>
> Would work if the string was the last in the line.
> Cheers,
> Pavel
>

I know but if we use a byte array and some calculations it is much easier.

My routine wasn't working because it determines chars und numbers in the
first byte of each line to find out where are comments.
So it hangs because all looked like comments.

If the text column would be the second or later it works fine.

One workaround could be to add a dummy column in front of the text column.

best regards

Reimar

> Justin wrote:
>
>> Use structures. In fact always use structures for everything because
>> Structures Are Your Friends. They'll make your programs elegant.
>>
>> ;Use a structure to specify that each line is a string and two floats
>> line = {col1:"a string", col2:0.0, col3:0.0}
>> num_lines = 100
>> ;Make an array of structures
>> data = REPLICATE(line, num_lines)
>> OPENR, lun, 'yourfile.dat', /GET_LUN
>> ;Read in all the data in one go
>> READF, lun, data
>> FREE_LUN, lun
>> ;Print out some of the data
>> PRINT, data[5].col1, data[7:9].col2, data.col3
>>

--
Reimar Bauer

Institut fuer Stratosphaerische Chemie (ICG-I)
Forschungszentrum Juelich
email: R.Bauer@fz-juelich.de
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[Message index]

		Re: String Data file By: R.Bauer on Thu, 31 July 2003 23:57
		Re: String Data file By: Pavel Romashkin on Thu, 31 July 2003 13:38
		Re: String Data file By: David Fanning on Thu, 31 July 2003 10:52
		Re: String Data file By: Justin[2] on Thu, 31 July 2003 10:46
		Re: String Data file By: R.Bauer on Thu, 31 July 2003 00:02
		Re: String Data file By: mperrin+news on Wed, 30 July 2003 21:26
		Re: String Data file By: andrew.cool on Wed, 30 July 2003 19:55
		Re: String Data file By: Rick Towler on Wed, 30 July 2003 16:30

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