comp.lang.idl-pvwave archive: archive » Re: End of File-Error message in simple readf routine

Home » Public Forums » archive » Re: End of File-Error message in simple readf routine - What's the problem?

Show: Today's Messages :: Show Polls :: Message Navigator
E-mail to friend

Re: End of File-Error message in simple readf routine - What's the problem? [message #55341 is a reply to message #55340]

Mon, 20 August 2007 00:23

britta.mey
Messages: 14
Registered: August 2007

Junior Member

On 20 Aug., 02:41, "mgal...@gmail.com" <mgal...@gmail.com> wrote:
> On Aug 19, 4:53 am, b...@uni-mainz.de wrote:
>
>
>
>> Hello,
>
>> i'm sorry to post a new message, but i did not find the answer to my
>> question, when i searched for it (or i did not use the fitting words
>> for the search).
>
>> I try to read the values of a file with three columns and 2072758 rows
>> (the file was created from a bmp-picture by the routine read_bmp).
>
>> My code is as follows:
>
>> file='E:\Dissertation\mz_cam\spectral_calib\dat-files
>> \070807\run24\070807_24_0013.dat'
>
>> n_pixel= 2072758
>> n_channels=3
>
>> dummy_ein=fltarr(n_channels)
>> dummy = ''
>
>> r=fltarr(n_pixel)
>> g=fltarr(n_pixel)
>> nir=fltarr(n_pixel)
>
>> close, 1
>> openr,1, file
>
>> for i=0, n_pixel-1 do begin
>> readf, 1, dummy_ein
>> g(i)=dummy_ein(0)
>> r(i)=dummy_ein(1)
>> nir(i)=dummy_ein(2)
>> endfor
>
>> end
>
>> Could the problem be related to the array length? I mean that there
>> are too many values for an array? I checked the number of values
>> several times, so i am quite sure that the number for n_pixel is
>> correct.
>
> To keep the loop, you definitely need the "L", that should fix the
> "loop expression too large for loop variable type." error.
>
> You didn't mention what the original problem was though. You did
> mention later that there was an "end of file error." So I would make
> sure there really are n_pixel number of rows in the data file. (Use
> "nLines = file_lines(file)" to find out.)
>
> By the way, you can do this without a loop:
>
> file = 'E:\Dissertation\mz_cam\spectral_calib\dat-files
> \070807\run24\070807_24_0013.dat'
>
> n_pixel = 2072758
> n_channels =3
>
> data = fltarr(n_channels, n_pixel)
>
> openr, lun, file, /get_lun
> readf, lun, data
> free_lun, lun
>
> ; if you need the data in separate arrays
> g = data[0, *]
> r = data[1, *]
> nir = data[2, *]
>
> Mike
> --www.michaelgalloy.com

Hello,

oh yes, i forgot in the original post to mention my problem. Sorry.
I'll try to fix my problem with your suggestions.

Thank you,

Britta

Report message to a moderator

[Message index]

		Re: End of File-Error message in simple readf routine - What's the problem? By: britta.mey on Mon, 20 August 2007 01:31
		Re: End of File-Error message in simple readf routine - What's the problem? By: britta.mey on Mon, 20 August 2007 00:23
		Re: End of File-Error message in simple readf routine - What's the problem? By: Michael Galloy on Sun, 19 August 2007 17:41
		Re: End of File-Error message in simple readf routine - What's the problem? By: David Fanning on Sun, 19 August 2007 05:57
		Re: End of File-Error message in simple readf routine - What's the problem? By: britta.mey on Sun, 19 August 2007 04:44
		Re: End of File-Error message in simple readf routine - What's the problem? By: britta.mey on Sun, 19 August 2007 04:28
		Re: End of File-Error message in simple readf routine - What's the problem? By: Conor on Mon, 20 August 2007 06:16
		Re: End of File-Error message in simple readf routine - What's the problem? By: britta.mey on Tue, 21 August 2007 01:14

Previous Topic:	how to study IDL?
Next Topic:	error message:unable to allocate memory

-=] Back to Top [=-

[ Syndicate this forum (XML) ] [

] [

]

Current Time: Sat Oct 11 15:04:45 PDT 2025

Total time taken to generate the page: 0.64178 seconds