Read 1335 times | Created 2017-01-03 23:52:56 | Updated 2017-01-04 00:07:57 | | |

<?php
/*
-- ----------------------------
-- DEMPSTER SHAFER
-- CREATED BY : CAHYA DSN
-- CREATED ON : 2017-01-02
-- UPDATED ON : 2017-01-03
-- ----------------------------

DROP TABLE IF EXISTS ds_problems;
CREATE TABLE IF NOT EXISTS ds_problems(
	id INT AUTO_INCREMENT,
	code VARCHAR(3),
	name VARCHAR(30),
	PRIMARY KEY (id)
) ENGINE=MyISAM CHARSET=utf8;

DROP TABLE IF EXISTS ds_symptoms;
CREATE TABLE IF NOT EXISTS ds_symptoms(
	id INT AUTO_INCREMENT,
	code VARCHAR(3),
	name VARCHAR(30),
	PRIMARY KEY (id)
) ENGINE=MyISAM CHARSET=utf8;

DROP TABLE IF EXISTS ds_rules;
CREATE TABLE IF NOT EXISTS ds_rules(
	id INT AUTO_INCREMENT,
	id_problem INT,
	id_symptom INT,
	cf float,
	PRIMARY KEY (id)
) ENGINE=MyISAM CHARSET=utf8;

********************************
DATA FOR SIMULATION ONLY
********************************
*/
$data=array(
	array('B,D,F',0.4),
	array('A,F',0.5),
	array('B',0.4),
	array('A,D,F',0.3)
);
$all=array();
foreach($data as $d) $all[]=$d[0];
$unique=array_unique(explode(',',implode(',',$all)));
$fod=implode(',',$unique);
echo "<pre>";
echo $fod;
$rst=array();
while(!empty($data)){
	$result=array();
	$symptom[0]=array_shift($data);
	$symptom[1]=array($fod,1-$symptom[0][1]);
	if(empty($rst))
		$result[0]=array_shift($data);
	else
		foreach($rst as $k=>$r)
			if($k!="&theta;")
				$result[]=array($k,$r);
	$theta=1;
	foreach($result as $r) $theta-=$r[1];
	$result[]=array($fod,$theta);
	$m=count($result);
	$rst=array();
	for($x=0;$x<$m;$x++){
		for($y=0;$y<2;$y++){
			if(!($x==$m-1 && $y==1)){
				$v=explode(',',$symptom[$y][0]);
				$w=explode(',',$result[$x][0]);
				sort($v);sort($w);
				$vw=array_intersect($v,$w);
				if(empty($vw)) $v="&theta;";else $v=implode(',',$vw);
				if(!isset($rst[$v])) $rst[$v]=$result[$x][1]*$symptom[$y][1];
				else $rst[$v]+=$result[$x][1]*$symptom[$y][1];
			}
		}
	}
	foreach($rst as $k=>$r) if($k!="&theta;") $rst[$k]=$r/(1-(isset($rst["&theta;"])?$rst["&theta;"]:0));
	print_r($rst);
}
unset($rst["&theta;"]);
arsort($rst);
print_r($rst);
?>
demo at 
<a href='http://cahyadsn.dev.php.or.id/extra/dst.php'>
http://cahyadsn.dev.php.or.id/extra/dst.php
</a> 
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