mieext_f.pro is an interface that uses the IDL CALL_EXTERNAL function to execute pre-compiled FORTRAN routines which perform single particle Mie scattering calculations. This procedure provides particle cross sections and the asymmetry parameter.

Calling the procedure

mieext_f is a IDL procedure and can be called using the following command (as long as the source file lies within your IDL_PATH environment variable):

mieext_f, NPts, Dx, Cm, Dqxt, Dqsc, Dg

The input parameters in the above call are:

The output parameters are: Note: All of the output variables are vectors of double precision floating point values, with Npts elements, and must be defined before the procedure is called.

Limitations and dependences

The mieext_f procedure expects to find an appropriate shared object file (filename.so) in the directory /home/crun/eodg/idl/mie/. If you are going to run the code from a different location, you will have to edit the mieext_f.pro accordingly.

Since this procedure calls pre-compiled FORTRAN code it is platform dependent. At present shared object files exist for the Alpha (mieext_alpha.so) and x86/Linux (mieext_x86.so) platforms.

The FORTRAN source code is also available from /home/crun/eodg/idl/mie/mieext.f. To compile this code for use with the x86/Linux platform, using the Intel FORTRAN Compiler, the command is:
ifc mieext.f -o mieext_x86.so -shared -w95 -Kpic -lm -132

To compile the code for use on the alpha platform the commands are:
f77 -c -extend_source mieext.f
ld -S -shared -o mieext_alpha.so mieext.o -lUfor -lfor -lFutil -lm -lots -lc

Download source code

The source code for this routine and supporting routines is part of the EODG Mie scattering distribution which may be downloaded as a gzipped tar file here.

Maintained by Greg McGarragh