Jul 29, 2025 · The record written by the standard unformatted output in your code works well. As far as I understand, it is the unformated used-defined derived-type I/O that produces wrong …

Aug 23, 2016 · Unformatted files contain record-length information, encoded in a vendor-specific way, interspersed with the data, in the file. Files with FORM='BINARY' are nonstandard, and …

Apr 13, 2020 · Unformatted binary files use a record size header and trailer, which can be different between different compilers or versions. You may want to review the gFortran option " …

Aug 23, 2012 · Was the data written by a fortran program? As Steve alluded, Fortran unformatted IO is written with record identifiers that bound each record and specify the length of the record …

Mar 22, 2016 · There are ways to "reinterpret" the type, but you have to know which type you want first. Furthermore, with sequential unformatted files you need to know in advance how …

Apr 9, 2019 · Dear friends from the ifort community, recently I have been confused by 2 run-time errors while reading an UNFORMATTED file which I opened first with

Nov 29, 2022 · This suggests an alternative format for larger ifort unformatted records could be 4-bytes else 12-bytes, ie a first 4-byte of header as -1, followed by an 8-byte length value.

Aug 26, 2016 · On what kind of system was the unformatted file written? Do you know what the file is supposed to contain? It does appear to have little-endian format, but the numbers do not …

Aug 7, 2018 · I uses the intel compiler v18. I'm faced with a problem reading data of unformatted sequential access type. It seems that intel compiler regards separated records as a one …

May 9, 2008 · The error message is backwards - it should say "unformatted I/O to unit open for formatted transfers". You opened unit 789 FORMATTED but are doing unformatted READs …