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Re: Probably a really simple read_ascii quesion.... [message #68147]

Thu, 01 October 2009 10:51

greg.addr
Messages: 160
Registered: May 2007

Senior Member

On 1 Okt., 15:59, hethomas <het...@googlemail.com> wrote:
> I am trying to read in a text file (which is in column format) using
> read_Ascii. Most of my variables read in fine, with the exception of
> the "time" colum, where data is in HH:MM:SS format. (IDL reads these
> in as 1.0000). Anyone know how to get around this?
> I did try playing with ascii_template (although I don't really want to
> have to use it), but for some reason , won't work and gives me the
> error message:
> Variable is undefined: SCREEN_SIZE.
> Error occurred at: AT_WIDGET 1364 C:\RSI\IDL63\lib
> \ascii_template.pro
> ASCII_TEMPLATE 1690 C:\RSI\IDL63\lib
> \ascii_template.pro
>
> I have the annoying feeling that this can be answered
> straighforwardly, and I just can't see it! Thanks in advance....
>
> Helen

read_ascii is painful to use. It's simpler to use function like this:

function read_textfile,filename
n=file_lines(filename)
s=strarr(n)
openr,lun,filename,/get_lun
readf,lun,s
free_lun,lun
return,s
end

and deal with the strings yourself. For time formats, you can make use
of this for decoding:

IDL> t='12:34:26'
IDL> time=0d ;you have to declare a double in advance...
IDL> reads,t,time,format='(C(CHI,x,CMI,x,CSI))'
IDL> print,string(time,format='(C())')
Sat Jan 01 12:34:26 1

Greg

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		Re: Probably a really simple read_ascii quesion.... By: greg.addr on Thu, 01 October 2009 10:51
		Re: Probably a really simple read_ascii quesion.... By: David Fanning on Thu, 01 October 2009 07:09

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