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idl writeu and fortran... [message #35730]

Thu, 10 July 2003 22:34

j oishi
Messages: 2
Registered: July 2003

Junior Member

hi,

i know i'm stepping into murky waters here, but i have a question about
using idl to write unformatted binary files for fortran. when i write a
single record, ie

openw,unit,'blah.dat',/f77_unformatted,/get_lun
d=fltarr(10)
writeu,unit,d
free_lun(unit)

and then read it in in f77, everything is fine. when i try to add multiple
records to the same file, everything goes to hell:

openw,unit,'blah2.dat',/f77_unformatted,/get_lun
d=fltarr(10)
e=fltarr(10,10)
writeu,unit,d
writeu,unit,e
free_lun(unit)

now, in this second example, i can read the first record out of blah2.dat,
but trying to get e (the second record) out, causes the following error:

data [14:14]$ ./readbin
start: end of file
apparent state: unit 12 named aa0000.D
lately reading sequential unformatted external IO
Abort trap

i've tried this using two versions of idl on two different architectures,
compilers, etc. (reading and writing, that is...not trying to cross
platform with binary files)

can anyone provide insight?

thanks,

j oishi

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[Message index]

		idl writeu and fortran... By: j oishi on Thu, 10 July 2003 22:34
		Re: idl writeu and fortran... By: Paul Van Delst[1] on Mon, 14 July 2003 06:46

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