Fortran weirdnesses
Henk Mos
mos at fys.ruu.nl
Thu May 2 08:04:55 AEST 1991
In <HUDGENS.91Apr29142057 at sun13.sun13.SCRI.FSU.EDU> hudgens at sun13.SCRI.FSU.EDU (Jim Hudgens) writes:
>This is on a Decstation 5000, Ultrix 4.1, f77 == U4V2.0p.
>Anyone ever seen anything like this??? A GKS window appears,
>and then the dbx drops out with the "I/O possible" message. Anyone
>know what might be causing this?
We have the same problems with 2.0. After creating a window (GKS3D) the
first line you draw will not show up. But there are more serious problems
with 2.0. Compiling with -O3 will give a very good speedup
because sometimes DO loops will just be skipped! We just received
the new 3.0 (2.1 has the same problems) but...
Have a look:
program test
a = 3.
b = 2(a)
c = 2**3(a)
write (6,*) b, c
end
This will compile (3.0) without any errors and the results are:
3.00000 24.00000
There are memory allocation and floating points problems as well, but
they are very difficult to locate. There seems to be an update so we'll
see.
Henk Mos
--
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Henk J. Mos, Dept of Physics and Astrophysics, Utrecht University
The Netherlands. Phone: 31-30-532239 Email: mos at fys.ruu.nl
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