How to install

Download and unpack sources of the library.
You can also use git program to get sources (git clone https://github.com/slazav/he3lib), then you can update the library easily by git pull, see changes by git log etc.
Build the library, using make program. You need C and Fortran compilers for that.
There is also a simple script make.bat for those who have problems with make.
If needed, build matlad/octave files by running make octave, make matlab or make matlab64. You need matlab/octave program for this. Compiled functions will be available in the matlab/ folder.
You can also start matlab/octave and run compile.m script located in the matlab/ folder.

How to use

The library can be used with different programming languages (Fortran, C, Matlab/Octave) and via a command-line interface.

Example programs and scripts can be found in the examples/ folder.

Fortran-77. You should use he3.fh include file and libhe3 library for Fortran-77 programs. All functions and arguments are real*8. Use -fno-range-check compiler flag to allow NaN values.
Fortran-90. Usage of the library in Fortran-90 programs is similar to that in Fortran-77, but you should use he3.f90h include file.
C. You should use he3.h include file and libhe3 library in C programs. Lowercase names with underscore should be used (like he3_pf_). Type of arguments is always double*, type of returned value is double.
Matlab, Octave. mex files are located in the matlab folder. Lowercase names should be used. In function arguments you can mix numbers with arrays or matrices of the same size. For example the command "fB = he3_nu_b(0:0.1:1, 0);" will give you Leggett frequency vs temperature at zero pressure. To build mex files you should run make octave, make matlab or make matlab64. Note, that fixed rpath is used for the library.
Command line.You can use all the functions via a command-line program he3. To get a list of all functions run the program without arguments. To get information about specific function, run the program with the function name as an argument. You can use matlab-style vectors "value1:step:value2" to get a table of values (if step is missing then 20 points will be printed): the command "he3 he3_nu_b 0.1:0.1:1 0" will give you Leggett frequency vs temperature at zero pressure.
Web interface. There is a simple web-server which runs the he3 command-line program. For example try the following link to get s-wave BCS gap $\Delta_\mbox{bcs}/T_c$ as a function of $T/T_c$:
http://slazav.xyz/cgi/he3?he3_bcsgap 0:0.05:1

Example programs and scripts can be found in the examples/ folder.

Acknowledgements

This library have been done in collaboration with my colleagues in Low temperature laboratory (Aalto University, Finland): P.Heikkinen, S.Autti, V.Eltsov, M.Krusius and G.Volovik. Other $^3$He programs and libraries have been used in the work: programs by V.Dmitriev (Kapitza institute, Moscow), S.Autti, $^3$He-B texture library by J.Kopu, programs by E.Thuneberg.