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Re: String Data file [message #35844 is a reply to message #35836]

Thu, 31 July 2003 13:38

Pavel Romashkin
Messages: 166
Registered: April 1999

Senior Member

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

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
>

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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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