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It can be copied from the cplex area on ITS Unix servers using the command At the shell prompt, (usually “%” for csh) you should execute the commandīeing careful that the script location is contained in backquotes.Ģ. Set up the Unix environment for statistical and mathematical applications using the perl script “appuser”. For this purpose the following steps can be taken, where it is assumed that you are in your account’s home directory and that you are using csh as your shell:ġ. You can compile a linear programming example, e.g., the file lpex2.c which comes with the CPLEX libraries distribution, in your account’s home directory and run the executable at your shell prompt as a learning exercise and as a template for constructing your own program. If you do not yet have ITS unix service validation you will need to acquire an ITS-issued account (IF or departmental) that has been validated for UTS service. Unix installations of the CPLEX libraries are installed on servers that are running on a Solaris 8 operating system. How do I call CPLEX libraries from my own program written in C on an ITS Unix server? Answer: Consequently, when you pass a FORTRAN string, you must add a terminating NULL character you do so by means of the FORTRAN intrinsic function CHAR(0).Calling CPLEX from C on a Unix server Question: When you pass strings to routines of the Callable Library, they expect C strings that is, strings terminated by an ASCII NULL character, denoted \0 in C. Consult your system documentation to determine the appropriate integer type to hold variables that are C pointers. On some systems, such as DEC Alpha, a variable of type INTEGER*8 may be needed. On most operating systems, the default integer type of four bytes is sufficient to hold pointer variables. In FORTRAN 77, such a pointer cannot be dereferenced however, you can store its value in an appropriate integer type, and you can then pass it to other ILOG CPLEX routines. Status = CPXprimopt (%val(env), %val(lp))Ĭertain ILOG CPLEX routines return a pointer to memory. For example, with that extension, you can call the routine CPXprimopt() with this FORTRAN statement: This operator used in calls to external functions or subroutines causes its argument to be passed by value (rather than by the default FORTRAN convention of passed by reference). To accommodate those routines, most FORTRAN compilers have the VMS FORTRAN extension %VAL(). In contrast, many routines of the Callable Library require arguments passed by value. Call by Referenceīy default, FORTRAN passes arguments by reference that is, the address of a variable is passed to a routine, not its value. Since routines in the Callable Library have names greater than six characters, you need to verify whether your FORTRAN compiler enforces this limit or allows longer identifiers. However, in practice, most FORTRAN compilers allow you to exceed this limit. Six-Character IdentifiersįORTRAN 77 allows identifiers that are unique only up to six characters. If you are able to turn off those postpended underscores, you may not need other "glue" routines. Some systems have an option to turn off this feature for example, on DEC Alpha running Digital Unix, the option -assume nounderscore turns off the postpended underscore. On some systems, all FORTRAN external symbols are created with an underscore character (that is, _) added to the end of the symbol name. On some operating systems, such as DEC Alpha running Digital Unix, certain intrinsic FORTRAN functions must be in all upper case (that is, capital letters) for the compiler to accept those functions. We recommend that you use this option in any file that calls ILOG CPLEX Callable Library routines. Most FORTRAN compilers have an option, such as the option -U on UNIX systems, that treats symbols in a case-sensitive way.
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Case-SensitivityĪs you know, FORTRAN is a case- insensitive language, whereas routines in the ILOG CPLEX Callable Library have names with mixed case. In that context, this section lists a few considerations particular to ILOG CPLEX in building a FORTRAN interface. As a first step in building such an interface, we advise you to study your system documentation about C-to-FORTRAN interfaces. Whether you need intermediate "glue" routines for the interface depends on your operating system. Since C-to-FORTRAN interfaces vary across platforms (operating system, hardware, compilers, etc.), you may need to modify the examples for your particular system. The examples were compiled on a particular platform. Choose Tech Support then choose Callable Library Examples.
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You can download examples of a FORTRAN application from the ILOG web site at. The Callable Library can be interfaced with FORTRAN applications.