Fortran read data with different length
Question
I have a Fortran problem. I want to read in data with different length. they begin with:
<TITLE>University of Wyoming - Radiosonde Data</TITLE>
<LINK REL="StyleSheet" HREF="/resources/select.css" TYPE="text/css">
<BODY BGCOLOR="white">
<H2>08190 Barcelona Observations at 12Z 11 Feb 2015</H2>
<PRE>
-----------------------------------------------------------------------------
PRES HGHT TEMP DWPT RELH MIXR DRCT SKNT THTA THTE THTV
hPa m C C % g/kg deg knot K K K
-----------------------------------------------------------------------------
1012.0 98 14.0 -1.0 36 3.53 0 0 286.2 296.5 286.8
from this point the file is for example 77 lines long. but others have only 55 , and the end is reached when this part comes
</PRE><H3>Station information and sounding indices</H3><PRE>
Station number: 8190
So I think I need a condition which runs out of the do loop? I get my data with :
wget 'http://weather.uwyo.edu/cgi-bin/sounding?region=europe& TYPE=TEXT%3ALIST&YEAR=2015&MONTH=02&FROM=1112&TO=1112&STNM=08190' -0 data.dat
open(33, file=infilename, form='formatted',&
access='sequential',action='read')
open(34, file=outfilename, form='formatted',&
access='sequential',action='write')
read(33,'(11/)')
do i=1,77
read(33, '(f7.1,2x,i5,2x,a5,2x,a5,4x,a3,3x,f4.2,4x,a3,4x,a3)') pres,height,tmp,tmp_dew,rel_hum,mixing,wind_dir,wind_speed
write(34,'(f7.1,2x,i5,2x,a5,2x,a5,4x,a3,3x,f4.2,4x,a3,4x,a3)') pres,height,tmp,tmp_dew,rel_hum,mixing,wind_dir,wind_speed
end do
close(33)
close(34)
I hope you can help me.
1 answers
solution1
0 ACCPTED 2015-02-11 16:11:23
one approach is to read each line as a string, check for the end and process accordingly:
character*1000 wholeline
do while( .true. )
read(33,'(a)')wholeline
if ( index(wholeline,'</PRE>' ).ne.0 )exit
read(wholeline,*)pres,height,tmp,tmp,dew ...
enddo
You can also perhaps more simply just read and exit on an error..
do while( .true. )
read(33,*,err=100)pres,height,tmp,tmp,dew ...
enddo
100 continue
I'm not a fan of deliberately throwing errors if it can be avoided though.
As an aside you do not need that messy format, list directed will work fine for this example. In fact if all you are doing is transferring the data to another file, simply rewrite the string as: write(34,'(a)')trim(wholeline)
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