+++ /dev/null
-#
-# $Header: /cvsroot/pgsql/contrib/statmath/Attic/Makefile,v 1.2 2000/07/09 13:13:41 petere Exp $
-#
-
-subdir = contrib/statmath
-top_builddir = ../..
-include ../../src/Makefile.global
-
-NAME := statmath
-SONAME := $(NAME)$(DLSUFFIX)
-
-CFLAGS += -I. $(CFLAGS_SL)
-
-all: $(SONAME) $(NAME).sql
-
-$(NAME).sql: $(NAME).sql.in
- sed -e 's:MODULE_PATHNAME:$(libdir)/contrib/$(SONAME):g' < $< > $@
-
-install: all installdirs
- $(INSTALL_SHLIB) $(SONAME) $(libdir)/contrib
- $(INSTALL_DATA) $(NAME).sql $(datadir)/contrib
- $(INSTALL_DATA) README.$(NAME) $(docdir)/contrib
-
-installdirs:
- $(mkinstalldirs) $(libdir)/contrib $(datadir)/contrib $(docdir)/contrib
-
-uninstall:
- rm -f $(libdir)/contrib/$(SONAME) $(datadir)/contrib/$(NAME).sql $(docdir)/contrib/README.$(NAME)
-
-clean:
- rm -f $(SONAME) $(NAME).sql
-
-depend dep:
- $(CC) -MM -MG $(CFLAGS) *.c > depend
-
-ifeq (depend,$(wildcard depend))
-include depend
-endif
+++ /dev/null
-/* ----------
- * Module statmath
- *
- * statistical aggregates for average, variance and standard
- * deviation.
- *
- * $Header: /cvsroot/pgsql/contrib/statmath/Attic/statmath.c,v 1.2 2000/07/04 14:37:32 wieck Exp $
- *
- * Jan Wieck
- * ----------
- */
-
-#include
-#include
-#include
-#include
-
-#include "postgres.h"
-#include "utils/palloc.h"
-
-
-/* ----------
- * Declarations
- *
- * statmath_stateval_in() Input function for state transition variable
- * statmath_stateval_out() Output function for state transition variable
- * statmath_collect() State transition function to collect items
- * statmath_average_fin() Final function for average aggregate
- * statmath_variance_fin() Final function for variance aggregate
- * statmath_stddev_fin() Final function for deviation aggregate
- * ----------
- */
-
-float64 statmath_stateval_in(char *str);
-char *statmath_stateval_out(float64 sval);
-
-float64 statmath_collect(float64 sval, float64 item);
-float64 statmath_average_fin(float64 sval, int4 n);
-float64 statmath_variance_fin(float64 sval, int4 n);
-float64 statmath_stddev_fin(float64 sval, int4 n);
-
-
-/* ----------
- * statmath_checkval -
- *
- * Bounds checking for float8 values in Postgres
- * ----------
- */
-static void
-statmath_checkval(double val)
-{
- if (fabs(val) > DBL_MAX)
- elog(ERROR, "statmath: overflow");
- if (val != 0.0 && fabs(val) < DBL_MIN)
- elog(ERROR, "statmath: underflow");
-}
-
-
-/* ----------
- * statmath_stateval_in -
- *
- * Input function for the state transition value data type.
- * The input string are two float8's separated with a colon ':'.
- * ----------
- */
-float64
-statmath_stateval_in(char *str)
-{
- float64 retval;
- double tmp;
- char *cp1, *cp2;
-
- if (!str)
- return (float64) NULL;
-
- /*
- * Allocate space for the result
- */
- retval = (float64) palloc(sizeof(float64data) * 2);
-
- /*
- * Get the first number
- */
- errno = 0;
- tmp = strtod(str, &cp1);
- if (*cp1 != ':' || errno == ERANGE)
- elog(ERROR, "statmath: illegal input format '%s'", str);
- statmath_checkval(tmp);
- retval[0] = tmp;
-
- /*
- * Get the second number
- */
- tmp = strtod(++cp1, &cp2);
- if (*cp2 != '\0' || errno == ERANGE)
- elog(ERROR, "statmath: illegal input format '%s'", str);
- statmath_checkval(tmp);
- retval[1] = tmp;
-
- /*
- * Return the internal binary format
- */
- return retval;
-}
-
-
-/* ----------
- * statmath_stateval_out -
- *
- * Output function for the state transition value data type.
- * ----------
- */
-char *
-statmath_stateval_out(float64 sval)
-{
- char buf[1024];
- double v1, v2;
-
- if (!sval)
- return pstrdup("(null)");
-
- /*
- * Print the values in the external format and return
- * the result in allocated space
- */
- v1 = sval[0];
- v2 = sval[1];
- sprintf(buf, "%.*g:%.*g", DBL_DIG, v1, DBL_DIG, v2);
- return pstrdup(buf);
-}
-
-
-/* ----------
- * statmath_collect -
- *
- * State transition function to collect data for the variance
- * and standard deviation aggregates.
- * The state transition variable holds 2 float8 values. The
- * first is the sum of the items, the second the sum of the
- * item quadratic products.
- * ----------
- */
-float64
-statmath_collect(float64 sval, float64 item)
-{
- float64 retval;
- double tmp;
-
- if (!sval || !item)
- return (float64) NULL;
-
- /*
- * Allocate space for the result
- */
- retval = (float64) palloc(sizeof(float64data) * 2);
-
- /*
- * Compute the new values
- */
- tmp = sval[0] + *item;
- statmath_checkval(tmp);
- retval[0] = tmp;
-
- tmp = sval[1] + *item * *item;
- statmath_checkval(tmp);
- retval[1] = tmp;
-
- /*
- * Return the result
- */
- return retval;
-}
-
-
-/* ----------
- * statmath_average_fin -
- *
- * Final computation function for the average aggregate.
- * ----------
- */
-float64
-statmath_average_fin(float64 sum, int4 n)
-{
- float64 retval;
- double tmp;
-
- if (!sum)
- return (float64) NULL;
-
- /*
- * Allocate space for the result
- */
- retval = (float64) palloc(sizeof(float64data));
-
- /*
- * Avoid division by zero if no items collected
- */
- if (n == 0)
- {
- *retval = 0.0;
- return retval;
- }
-
- /*
- * Compute the average
- */
- tmp = *sum / (double)n;
- statmath_checkval(tmp);
- *retval = tmp;
-
- /*
- * Return the result
- */
- return retval;
-}
-
-
-/* ----------
- * statmath_variance_fin -
- *
- * Final computation function for the variance aggregate
- * ----------
- */
-float64
-statmath_variance_fin(float64 sval, int4 n)
-{
- float64 retval;
- double avg;
- double variance;
-
- if (!sval)
- return (float64) NULL;
-
- /*
- * Allocate space for the result
- */
- retval = (float64) palloc(sizeof(float64data));
-
- /*
- * Avoid division by zero if less than 2 items collected
- */
- if (n < 2)
- {
- *retval = 0.0;
- return retval;
- }
-
- /*
- * Calculate the variance
- */
- avg = sval[0] / (double)n;
- variance = (sval[1] - sval[0] * avg) / ((double)n - 1.0);
-
- statmath_checkval(variance);
- *retval = variance;
-
- /*
- * Return the result
- */
- return retval;
-}
-
-
-/* ----------
- * statmath_stateval_in -
- *
- * Input function for the state transition value data type
- * ----------
- */
-float64
-statmath_stddev_fin(float64 sval, int4 n)
-{
- float64 retval;
- double avg;
- double stddev;
-
- if (!sval)
- return (float64) NULL;
-
- /*
- * Allocate space for the result
- */
- retval = (float64) palloc(sizeof(float64data));
-
- /*
- * Avoid division by zero if less than 2 items collected
- */
- if (n < 2)
- {
- *retval = 0.0;
- return retval;
- }
-
- /*
- * Calculate the standard deviation
- */
- avg = sval[0] / (double)n;
- stddev = sqrt((sval[1] - sval[0] * avg) / ((double)n - 1.0));
-
- statmath_checkval(stddev);
- *retval = stddev;
-
- /*
- * Return the result
- */
- return retval;
-}
-
-
+++ /dev/null
--- statmath.sql
---
--- Install the statistical aggregates
---
-
---
--- Create the new data type for the state transition variable
---
-CREATE FUNCTION statmath_stateval_in(opaque)
- RETURNS statmath_stateval
- AS 'MODULE_PATHNAME'
- LANGUAGE 'C';
-
-CREATE FUNCTION statmath_stateval_out(opaque)
- RETURNS opaque
- AS 'MODULE_PATHNAME'
- LANGUAGE 'C';
-
-CREATE TYPE statmath_stateval (
- internallength = 16,
- input = statmath_stateval_in,
- output = statmath_stateval_out,
- alignment = double
-);
-
---
--- Create the statistic data collector used in the aggregates
---
-CREATE FUNCTION statmath_collect(statmath_stateval, float8)
- RETURNS statmath_stateval
- AS 'MODULE_PATHNAME'
- LANGUAGE 'C';
-
---
--- Create the final functions for the three aggregates
---
-CREATE FUNCTION statmath_average_fin(float8, int4)
- RETURNS float8
- AS 'MODULE_PATHNAME'
- LANGUAGE 'C';
-
-CREATE FUNCTION statmath_variance_fin(statmath_stateval, int4)
- RETURNS float8
- AS 'MODULE_PATHNAME'
- LANGUAGE 'C';
-
-CREATE FUNCTION statmath_stddev_fin(statmath_stateval, int4)
- RETURNS float8
- AS 'MODULE_PATHNAME'
- LANGUAGE 'C';
-
---
--- Create the aggregates themself
---
-CREATE AGGREGATE average (
- basetype = float8,
- stype1 = float8,
- stype2 = int4,
- sfunc1 = float8pl,
- sfunc2 = int4inc,
- finalfunc = statmath_average_fin,
- initcond1 = '0',
- initcond2 = '0'
-);
-
-CREATE AGGREGATE variance (
- basetype = float8,
- stype1 = statmath_stateval,
- stype2 = int4,
- sfunc1 = statmath_collect,
- sfunc2 = int4inc,
- finalfunc = statmath_variance_fin,
- initcond1 = '0:0',
- initcond2 = '0'
-);
-
-CREATE AGGREGATE stddev (
- basetype = float8,
- stype1 = statmath_stateval,
- stype2 = int4,
- sfunc1 = statmath_collect,
- sfunc2 = int4inc,
- finalfunc = statmath_stddev_fin,
- initcond1 = '0:0',
- initcond2 = '0'
-);
-
-
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