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stat_r.c -- statistical operations

Qhull records many statistics. These functions and macros make it inexpensive to add a statistic.

As with Qhull's global variables, the statistics data structure is accessed by a macro, 'qhstat'. If qh_QHpointer is defined, the macro is 'qh_qhstat->', otherwise the macro is 'qh_qhstat.'. Statistics may be turned off in user_r.h. If so, all but the 'zz' statistics are ignored.

Copyright © 1995-2020 C.B. Barber

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Index to stat_r.c and stat_r.h

• stat_r.h types
• stat_r.h constants
• stat_r.h macros
• stat_r.c functions

»stat_r.h types

• intrealT union of integer and real
• qhstat global data structure for statistics

»stat_r.h constants

• qh_KEEPstatistics 0 turns off most statistics
• Z..., W... integer (Z) and real (W) statistics
• ZZstat Z.../W... statistics that remain defined if qh_KEEPstatistics=0
• ztype zdoc, zinc, etc. for definining statistics

»stat_r.h macros

• MAYdebugx called frequently for error trapping
• zadd_/wadd_ add value to an integer or real statistic
• zdef_ define a statistic
• zinc_ increment an integer statistic
• zmax_/wmax_ update integer or real maximum statistic
• zmin_/wmin_ update integer or real minimum statistic
• zval_/wval_ set or return value of a statistic

»stat_r.c functions

• qh_allstatA define statistics in groups of 20
• qh_allstatistics reset printed flag for all statistics
• qh_collectstatistics collect statistics for qh.facet_list
• qh_initstatistics allocate and initialize statistics
• qh_newstats returns True if statistics for zdoc
• qh_nostatistic true if no statistic to print
• qh_printallstatistics print all statistics
• qh_printstatistics print statistics to a file
• qh_printstatlevel print level information for a statistic
• qh_printstats print statistics for a zdoc group
• qh_stddev compute the standard deviation and average from statistics

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Comments to: qhull@qhull.org
Created: May 2, 1997 --- Last modified: see top