[英]Merge 2 multi-dimension arrays and sum value
I have two multidimensional arrays which store x and y coordinates I am trying to merge together into a single array while preserving the x value but adding together the y values. 我有两个存储x和y坐标的多维数组,我试图将它们合并到一个数组中,同时保留x值,但将y值加在一起。
Array 1: 阵列1:
Array(
[0] => Array
(
[x] => 1327449600000
[y] => 5
)
[1] => Array
(
[x] => 1327450500000
[y] => 1
)
Array 2: 阵列2:
Array(
[0] => Array
(
[x] => 1327449600000
[y] => 1
)
[1] => Array
(
[x] => 1327450500000
[y] => 3
)
So the combined outcome would be: 因此,合并结果将是:
Array(
[0] => Array
(
[x] => 1327449600000
[y] => 6
)
[1] => Array
(
[x] => 1327450500000
[y] => 4
)
Any help would be greatly appreciated. 任何帮助将不胜感激。
Each of your original arrays is a vector; 每个原始数组都是一个向量。 let's allow them to contain an arbitrary amount of points (of any dimension): 让我们允许它们包含任意数量的点(任意维度):
function addPoints( vectorA, vectorB )
{
if( vectorA.length != vectorB.length ) return [];
var vectorC = [];
for( var i=0; i<vectorA.length; ++i )
{
var tmp = [];
for( var j in vectorA[i] ) tmp.push( vectorA[i][j]+vectorB[i][j] );
vectorC.push( tmp );
}
return vectorC;
}
EDIT: 编辑:
I just realized you were writing PHP. 我刚刚意识到您正在编写PHP。 Give me a sec to convert the code please. 请给我几秒钟来转换代码。
function addPoints( $veca, $vecb )
{
if( count($veca)!=count($vecb) ) return array();
$vecc = array();
for( $i=0; $i<count($veca); ++$i )
{
$tmp = array();
foreach( $veca[$i] as $key => $val ) $tmp[$key] = $val + $vecb[$i][$key];
$vecc[] = $tmp;
}
return $vecc;
}
function add_array($a1, $a2) {
$c = count($a1);
for ($i=0;$i<$c;$i++) {
if (isset($a2[$i]) && isset($a2[$i]['y'])) {
$a1[$i]['y'] += $a2[$i]['y'];
}
}
return $a1;
}
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