rand_norm.cc File Reference

Generate random number from standard normal distribution. More...

#include "sqlstat.h"
#include "sqlrand.h"

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Functions
my_bool	rand_norm_init (UDF_INIT *initid, UDF_ARGS *args, char *message)
	Called before first usage of function. More...
double	rand_norm (UDF_INIT *initid, UDF_ARGS *args, char *is_null, char *error)
	Retrieve a variate of the normal distribution. More...
void	rand_norm_deinit (UDF_INIT *initid)
	Called after last access to function. More...

Detailed Description

Generate random number from standard normal distribution.

CREATE FUNCTION rand_norm RETURNS REAL SONAME 'libsqlstat.so'; SELECT rand_norm() FROM mytab; DROP FUNCTION rand_norm;

Definition in file rand_norm.cc.

Function Documentation

double rand_norm	(	UDF_INIT *	initid,
		UDF_ARGS *	args,
		char *	is_null,
		char *	error
	)

Retrieve a variate of the normal distribution.

The default value for the mean is 0, the default value of the standard deviation is 1.

Parameters

initid	function description
args	argument values
is_null	result is NULL
error	error message

Returns

random number

Definition at line 84 of file rand_norm.cc.

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rand_norm_deinit

(

UDF_INIT *

initid

)

Called after last access to function.

Parameters

initid

Definition at line 111 of file rand_norm.cc.

my_bool rand_norm_init	(	UDF_INIT *	initid,
		UDF_ARGS *	args,
		char *	message
	)

Called before first usage of function.

Checksparameters.
Indicate type of return value.

Parameters

initid	function description
args	parameters
message	error message

Returns

success = 0

Definition at line 46 of file rand_norm.cc.

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