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<html>
<head>
<title>
XERROR - Error Message Handler.
</title>
</head>
<body bgcolor="#EEEEEE" link="#CC0000" alink="#FF3300" vlink="#000055">
<h1 align = "center">
XERROR <br> Error Message Handler
</h1>
<hr>
<p>
<b>XERROR</b>
is a FORTRAN77 library 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.
</p>
<p>
Most users never encounter <b>XERROR</b> directly. However,
they may receive warnings and other error messages produced
by <b>XERROR</b>, if the software they are calling has encountered
an error condition and uses <b>XERROR</b> to report and
handle the problem.
</p>
<p>
An experienced user or software developer may wish to incorporate
<b>XERROR</b> into software being developed, or to modify the
behavior of <b>XERROR</b> 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.
</p>
<h3 align = "center">
Languages:
</h3>
<p>
<b>XERROR</b> is available in
<a href = "../../f77_src/xerror/xerror.html">a FORTRAN77 version</a> and
<a href = "../../f_src/xerror/xerror.html">a FORTRAN90 version</a>.
</p>
<h3 align = "center">
Related Data and Programs:
</h3>
<p>
<a href = "../../f_src/dqed/dqed.html">
DQED</a>,
a FORTRAN90 library which
carries out constrained minimization, and
which includes
a version of the <b>XERROR</b> library.
</p>
<p>
<a href = "../../f_src/dlap/dlap.html">
DLAP</a>,
a FORTRAN90 library which
implements iterative linear equation solvers
and includes
a version of the <b>XERROR</b> library.
</p>
<p>
<a href = "../../f77_src/machine/machine.html">
MACHINE</a>,
a FORTRAN77 library which
tabulate the values
of certain machine-specific arithmetic quantities. The
<b>XERROR</b> library calls it for some simple information.
</p>
<p>
<a href = "../../f77_src/nms/nms.html">
NMS</a>,
a FORTRAN77 library which includes
a version of the <b>XERROR</b> library.
</p>
<p>
<a href = "../../f77_src/quadpack/quadpack.html">
QUADPACK</a>,
a FORTRAN77 library which
estimates integrals, and which calls the <b>XERROR</b> library.
</p>
<p>
<a href = "../../f_src/slatec/slatec.html">
SLATEC</a>,
a FORTRAN90 library which
includes a version of
the <b>XERROR</b> library.
</p>
<p>
<a href = "../../f77_src/starpac/starpac.html">
STARPAC</a>,
a FORTRAN77 library which
includes a version of the <b>XERROR</b> library.
</p>
<h3 align = "center">
Reference:
</h3>
<p>
<ol>
<li>
Phyllis Fox, Andrew Hall, Norman Schryer,<br>
Algorithm 528:<br>
Framework for a Portable Library,<br>
ACM Transactions on Mathematical Software,<br>
Volume 4, Number 2, June 1978, page 176-188.
</li>
<li>
Ron Jones, David Kahaner,<br>
XERROR, The SLATEC Error Handling Package,<br>
Software: Practice and Experience,<br>
Volume 13, Number 3, 1983, pages 251-257.
</li>
<li>
Ron Jones, David Kahaner,<br>
XERROR, The SLATEC Error Handling Package,<br>
Technical Report SAND82-0800,<br>
Sandia National Laboratories, 1982.
</li>
<li>
David Kahaner, Cleve Moler, Steven Nash,<br>
Numerical Methods and Software,<br>
Prentice Hall, 1989,<br>
ISBN: 0-13-627258-4,<br>
LC: TA345.K34.
</li>
</ol>
</p>
<h3 align = "center">
Source Code:
</h3>
<p>
<ul>
<li>
<a href = "xerror.f">xerror.f</a>, the source code.
</li>
<li>
<a href = "xerror.sh">xerror.sh</a>,
commands to compile the source code.
</li>
</ul>
</p>
<h3 align = "center">
Examples and Tests:
</h3>
<p>
<ul>
<li>
<a href = "xerror_prb.f">xerror_prb.f</a>,
a sample calling program.
</li>
<li>
<a href = "xerror_prb.sh">xerror_prb.sh</a>,
commands to compile and run the sample program.
</li>
<li>
<a href = "xerror_prb_output.txt">xerror_prb_output.txt</a>,
the output file.
</li>
</ul>
</p>
<h3 align = "center">
List of Routines:
</h3>
<p>
<ul>
<li>
<b>FDUMP</b> produces a symbolic dump.
</li>
<li>
<b>I1MACH</b> returns integer machine dependent constants.
</li>
<li>
<b>J4SAVE</b> saves and recalls global variables.
</li>
<li>
<b>NUMXER</b> returns the most recent error number.
</li>
<li>
<b>TIMESTAMP</b> prints out the current YMDHMS date as a timestamp.
</li>
<li>
<b>XERABT</b> aborts program execution.
</li>
<li>
<b>XERBLA</b> is an error handler for the Level 2 and Level 3 BLAS routines.
</li>
<li>
<b>XERCLR</b> resets the most recent error number to 0.
</li>
<li>
<b>XERCNT</b> allows user control over the handling of errors.
</li>
<li>
<b>XERCTL</b> allows the user control over individual errors.
</li>
<li>
<b>XERDMP</b> prints the error tables and then clears them.
</li>
<li>
<b>XERHLT</b> aborts program execution.
</li>
<li>
<b>XERMAX</b> sets the maximum number of times an error message is printed.
</li>
<li>
<b>XERMSG</b> processes error messages.
</li>
<li>
<b>XERPRN</b> prints error messages processed by XERMSG.
</li>
<li>
<b>XERPRT</b> prints a message on each file receiving error messages.
</li>
<li>
<b>XERROR</b> processes a diagnostic error message.
</li>
<li>
<b>XERRWV</b> processes a diagnostic error message.
</li>
<li>
<b>XERSAV</b> records that a particular error has occurred.
</li>
<li>
<b>XERSVE</b> records that an error has occurred.
</li>
<li>
<b>XGETF</b> returns the error control flag.
</li>
<li>
<b>XGETUA</b> reports the unit numbers of the files receiving error messages.
</li>
<li>
<b>XGETUN</b> reports the first unit number of the files receiving error messages.
</li>
<li>
<b>XSETF</b> sets the error control flag.
</li>
<li>
<b>XSETUA</b> sets the unit numbers of the files receiving error messages.
</li>
<li>
<b>XSETUN</b> sets the unit number of the main error output file.
</li>
</ul>
</p>
<p>
You can go up one level to <a href = "../f77_src.html">
the FORTRAN77 source codes</a>.
</p>
<hr>
<i>
Last modified on 09 April 2007.
</i>
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