SMElib

Spectroscopy Made Easy Source Library

This is just the C and Fortran part of SME. The complete package is available at download. The classic IDL version of SME is available for download.

Spectroscopy Made Easy (SME) is a software tool that fits an observed spectrum of a star with a model spectrum. Since its initial release in 1996.

Download

You can find compiled versions of the library for Unix, Mac OS, and Windows under Releases.

There are two versions for each OS. The gfortran version uses gfortran to compile the Fortran code, while the F2C version first converts the Fortran code to C++ code. The difference between these two are that f2c does not require libgfortran, but gives slightly numerical differences. It also appears to run faster in preliminary tests. Note that depending on your system you might have to install libgfortran as well.

Notes

• SMElib requires libgfortran to be installed. The exact version, depends on the version of SMELib that you are installing and on your OS. Releases of the SMElib include the required libgfortran, that was used to compile it. If you have problems loading the library try adding that libgfortran to your library path or install that version using your package manager. You can determine the version required by your library using the ldd command line utility on linux/macos, or https://github.com/lucasg/Dependencies on Windows.
• If this does not solve the libgfortran issues, try compiling the library on your machine using the instructions on section Build below.
• SMELib needs the datafiles to be present, or it will fail silently. It is therefore recommended to use the included setLibraryPath(path-to-the-datafiles) function. While SMElib comes with a default location when it is compiled, the location is dependant on the machine it is run on. You can check the currently set path with getLibraryPath() and the names of the required datafiles with GetDataFiles().
• On Mac OSX the absolute path of the libraries is coded into the .dylib files. If they are moved or renamed they need to be changed with install_name_tool -id <fullpath> libsme.dylib where fullpath is the full absolute path to this .dylib

Build

It is also possible to build the library yourself. This requires a C and a Fortran 77 compiler. SMELib can be build using the GNU Autotools using the following commands

# Clone the repository
git clone https://github.com/AWehrhahn/SMElib.git
# Move into the new directory
cd SMElib

# Set up the Autotools
./bootstrap
# This creates a Makefile, that will compile SMElib in the local directory
# If you want to compile it for this machine, remove the '--prefix=$PWD' parameter
./configure --prefix=$PWD
# Compile the library
make install

The compiled library should now found in "lib" (or in "bin" on Windows), while the datafiles are in "share/libsme".

Common issues with this compilation are:

• The compiler can't find libgfortran. Find libgfortran on your machine and set LDFLAGS="-LFortranPath", where FortranPath is the path to the directory containing libgfortran. The path might be located using gfortran --print-file-name=.
• The compiler uses the wrong compilers. Set them exlicitly using CXX=CCompiler and F77=FCompiler.