| Re: ascii_template advanced [message #49997] |
Fri, 08 September 2006 09:04 |
greg michael
Messages: 163
Registered: January 2006
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Senior Member |
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read_ascii is an IDL joke to scare away new users... try something
easier like:
s=strarr(file_lines(filename))
openr,1,filename
readf,1,s
close,1
s=(s[where(strmid(s,0,1) ne '#')])[1:*] ;get rid of the comments and
field names
time=strmid(s,0,8) ;time is a tricky format - take it as a string for
now
s=strmid(s,9) ;chop the time off
m=replicate({voltage:0.,current:0.,temp:0.},n_elements(s)) ;make your
structure array
s=strjoin(strsplit(strjoin(s,','),';',/extract),',') ;swap those pesky
semicolons for commas
reads,s,m ;make the conversion
regards,
greg
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| Re: ascii_template advanced [message #50007 is a reply to message #49997] |
Thu, 07 September 2006 13:02  |
maye
Messages: 29
Registered: June 2006
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Junior Member |
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Mike Wallace wrote:
> Create the template with ascii_template() as you normally would for one
> of your data files. For each of the data files, open it and count the
> the number of lines that you want to skip. Then change the datastart
> value in the template structure to start at the correct line. Now call
> read_ascii with your updated template.
>
> So, in short, hack the template structure returned from ascii_template()
> for each file so that it starts reading on the correct line.
>
> -Mike
Thanks guys, I will try these two last hints out, although I then
almost will reach David's suggestion, which I tried to avoid by
fiddling with ascii_template. ;)
Regards,
Michael
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| Re: ascii_template advanced [message #50014 is a reply to message #50007] |
Thu, 07 September 2006 08:05 |
Mike Wallace
Messages: 25
Registered: May 2006
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Junior Member |
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Create the template with ascii_template() as you normally would for one
of your data files. For each of the data files, open it and count the
the number of lines that you want to skip. Then change the datastart
value in the template structure to start at the correct line. Now call
read_ascii with your updated template.
So, in short, hack the template structure returned from ascii_template()
for each file so that it starts reading on the correct line.
-Mike
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| Re: ascii_template advanced [message #50015 is a reply to message #50014] |
Thu, 07 September 2006 07:53 |
Jo Klein
Messages: 54
Registered: January 2006
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Member |
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If you don't feel confident enough to program a filter for this, you can
simply preprocess your input data before feeding it into IDL with e.g. sed.
You could do:
sed 's/^#//' mydata.txt > mydatawithoutcomments.txt
to remove all lines starting with #.
Cheers,
Jo
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| Re: ascii_template advanced [message #50017 is a reply to message #50015] |
Thu, 07 September 2006 06:40 |
David Fanning
Messages: 11724
Registered: August 2001
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Senior Member |
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maye writes:
> The problem I have with the ascii_template/read_ascii combination is
> really the unknown amount of comment lines at the beginning plus the
> fact that I want to read the header line in AFTER those unknown amount
> of lines.
> Because the template let's me ignore the comment lines, but then the
> first line of my data structure will contain the variable names.
> Also, when I use the DATA_START keyword of read_ascii, it counts again
> from the beginning of the file, not from where I already defined the
> data to be of value (meaning withOUT the comment lines).
> If it would work like that, I could define the template to ignore
> comment lines, and then skip one extra line at the read_ascii command,
> using it for the HEADER keyword to read in the variable names. Would it
> not make more sense if things work like that?
> I hope I made myself clear? :-/ By the way, if somebody wonders: I want
> the variables names for a GUI to be clickable. ;)
> Does anybody have a solution for this?
I don't have a solution, but I'm certain there must
be one, since I've never had to use READ_ASCII in
20+ years of IDL programming. Perhaps you have to
write a program. :-)
Cheers,
David
--
David Fanning, Ph.D.
Fanning Software Consulting, Inc.
Coyote's Guide to IDL Programming: http://www.dfanning.com/
Sepore ma de ni thui.
(Opata Indian saying, meaning "Perhaps thou speakest truth.")
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