xerror, a FORTRAN77 code which collects information about errors that occur during a program's execution, and takes the appropriate action, which may include printing a message, diverting to a user routine, or aborting execution of the program.
Most users never encounter XERROR directly. However, they may receive warnings and other error messages produced by XERROR, if the software they are calling has encountered an error condition and uses XERROR to report and handle the problem.
An experienced user or software developer may wish to incorporate XERROR into software being developed, or to modify the behavior of XERROR in software they are using. The package includes many routines to customize its behavior, to reduce the level of output, to make multiple copies of the error output, to control the number of times a particular error message is printed, or to halt execution of the program if certain kinds of error occur.
The computer code and data files described and made available on this web page are distributed under the GNU LGPL license.
xerror is available in a FORTRAN77 version and a FORTRAN90 version.
DQED, a FORTRAN90 library which carries out constrained minimization, and which includes a version of the XERROR library.
DLAP, a FORTRAN90 library which implements iterative linear equation solvers and includes a version of the XERROR library.
MACHINE, a FORTRAN77 library which tabulate the values of certain machine-specific arithmetic quantities. The XERROR library calls it for some simple information.
NMS, a FORTRAN77 library which includes a version of the XERROR library.
QUADPACK, a FORTRAN77 library which estimates integrals, and which calls the XERROR library.
SLATEC, a FORTRAN90 library which includes a version of the XERROR library.
STARPAC, a FORTRAN77 library which includes a version of the XERROR library.