Help with Fortran90
This page is dedicated to conversation and mutual help on creating Neptunian satellite ephemeris using Le Guyader's and Jerome Berthier's ftp://ftp.imcce.fr/pub/ephem/satel/neptuno/
First approach: f77
In Config.mk replace FC = xlf with FC = f77 and type 'make'. You will see lots of errors like
isat_d.f: In subroutine `isatd': isat_d.f:1353: 210 format(8x,' Dernier pas:',d23.16)' ^ Invalid form for FORMAT statement at (^)
In my opinion the reason is that the code is not FORTRAN77 conform. I tried to overcome this problem by fixing the source code, there is an awful lot of wrong format statements. For finding the input files I changed in fs2fd.f:
infile = trim(dir_s)//trim(fil_s) outfile = trim(dir_d)//trim(fil_d)
infile = './data/Nsat-fs.dat' outfile = './data/Nsat-fd.dat'
Same in ins_d.f:
theofile = './data/Nsat-fd.dat'
Additionally in ins_d.f I had to move the passage
LOGICAL FIRST DATA FIRST/.TRUE./
after the COMMON block:
COMMON/STCOMX/KM,BARY,PVSUN LOGICAL FIRST DATA FIRST/.TRUE./
FORTRAN77 seem not to support variable size arrays, so in isat_d.f I had to replace
in line 183 with
The same for lines 2455 and 2456. In line I removed the definition of w(3,np,0:nd). After that the source compiled into an executable called 'ilgs_d', which is ought to be the double precision version. The quad precision version would be called 'ilgs_q'. Anyway, the executable failed with the following output:
________________________________________ Fichier ./data/Nsat-fd.dat ________________________________________ open: No such file or directory apparent state: unit 12 named /DATA/DE403/de403.unx last format: list io lately reading direct unformatted external IO Aborted
Second approach: f2c
Using f2c gives the same results as using f77. I hoped to get more insight from reading the C-code, but I did not.
The file ./data/Nsat-fd.dat exists, maybe the error refers to the file /DATA/DE403/de403.unx, which is indeed missing on my system, And I do not know from where to get it. At ftp://ssd.jpl.nasa.gov/pub/eph/planets/bsp/DE403.BSP I found the file for Sparc architecture, for i386 it seems not to be available any more, but it could be created from DE403.BSP.
But before doing further investigation I would like to ask a FORTRAN programmer about