Installing and Testing the Code

Unpack the tar archive on a UNIX machine using the command

tar -xvf maxent.tar

The archive consists of the main directory MAXENT-V1.4 and several sub-directories. Use the command cd MAXENT-V1.4 to change to the MAXENT-V1.4 directory. Now, you will see the following sub-directories and files:

• README: README file that points to this document for instructions on the installation and use of the library;
• bin: executable is placed here after compiling and linking the code;
• doc: user's manual (PDF) is available in the doc/manual directory;
• lib: static library file libmaxent.a is placed here when make maxentlib is executed;
• makefile: a makefile at the top directory that depending on the desired action, executes the makefile in the sub-directory src;
• makefile.inc: file that is included in makefile; contains the settings for the compilers, compiler-options, and flags;
• run: a directory from where the program can be executed;
• src: all source files are located in this directory--two Fortran 90 module files (maxent.f90 and priorweightfunction.f90) and the public domain Fortran 77 program lbfgs.f [19]. The subroutines dpotrf and dpotri from the Lapack library are used; linking to the blas and lapack libraries is required to have access to these subroutines. These subroutines are used only if $d > 3$ . If data approximation in 1-, 2-, or 3-dimensions is to be performed, these libraries are not needed. If so, set the DEFS macro to be empty in the file makefile.inc in the src directory; also see the makefile that resides in this sub-directory.
• tests: sample input data files are provided; the outputs that are generated when these input files are used in the program execution are available in the tests/results directory;