"함수 geomean()"의 두 판 사이의 차이

2020년 11월 2일 (월) 02:36 기준 최신판

GEOMEAN
array_geomean

1 Excel[ | ]

=GEOMEAN(1,2,3,4,5)
// 2.605171085

=GEOMEAN(4,5,8,7,11,4,3)
// 5.47698697

=GEOMEAN(-1,3,4,10293)
// #NUM!

=GEOMEAN(-1,-2,-3,-4,-5)
// #NUM!

2 PHP[ | ]

function geomean() {
	$args = func_get_args();
	$m = 1;
	foreach($args as $n) $m *= $n;
	return pow($m,1/count($args));
}

echo geomean( 1, 2, 3, 4, 5 );
// 2.6051710846974
echo geomean( 4, 5, 8, 7, 11, 4, 3 );
// 5.476986969657
echo geomean( -1, 3, 4, 10293 );
// NAN
echo geomean( -1, -2, -3, -4, -5 );
// NAN

function array_geomean($arr) { 
	$m = 1;
	foreach($arr as $n) $m *= $n;  
	return pow($m,1/count($arr));
}

echo array_geomean( [1, 2, 3, 4, 5] );
// 2.6051710846974
echo array_geomean( [4, 5, 8, 7, 11, 4, 3] );
// 5.476986969657
echo array_geomean( [-1, 3, 4, 10293] );
// NAN
echo array_geomean( [-1, -2, -3, -4, -5] );
// NAN

3 같이 보기[ | ]

@@ 5번째 줄: / 5번째 줄: @@
 ==Excel==
 [[category: Excel]]
-<source lang='PHP'>
+<syntaxhighlight lang='PHP'>
 =GEOMEAN(1,2,3,4,5)
 // 2.605171085
@@ 17번째 줄: / 17번째 줄: @@
 =GEOMEAN(-1,-2,-3,-4,-5)
 // #NUM!
-</source>
+</syntaxhighlight>
 ==PHP==
 [[category: PHP]]
-<source lang='PHP'>
+<syntaxhighlight lang='PHP'>
-function array_geomean($a) {
+function geomean() {
-   foreach($a as $i=>$n) $mul = $i == 0 ? $n : $mul*$n;
+	$args = func_get_args();
-   return pow($mul,1/count($a));
+	$m = 1;
+	foreach($args as $n) $m *= $n;
+	return pow($m,1/count($args));
 }
-echo array_geomean( array(1, 2, 3, 4, 5) );
+echo geomean( 1, 2, 3, 4, 5 );
 // 2.6051710846974
-echo array_geomean( array(4, 5, 8, 7, 11, 4, 3) );
+echo geomean( 4, 5, 8, 7, 11, 4, 3 );
 // 5.476986969657
-echo array_geomean( array(-1, 3, 4, 10293) );
+echo geomean( -1, 3, 4, 10293 );
 // NAN
-echo array_geomean( array(-1, -2, -3, -4, -5) );
+echo geomean( -1, -2, -3, -4, -5 );
 // NAN
-</source>
+</syntaxhighlight>
+<syntaxhighlight lang='PHP'>
+function array_geomean($arr) {
+	$m = 1;
+	foreach($arr as $n) $m *= $n;
+	return pow($m,1/count($arr));
+}
+echo array_geomean( [1, 2, 3, 4, 5] );
+// 2.6051710846974
+echo array_geomean( [4, 5, 8, 7, 11, 4, 3] );
+// 5.476986969657
+echo array_geomean( [-1, 3, 4, 10293] );
+// NAN
+echo array_geomean( [-1, -2, -3, -4, -5] );
+// NAN
+</syntaxhighlight>
+==같이 보기==
+*[[함수 harmean()]]
+*[[기하평균]]