{"id":16805,"date":"2022-10-22T05:45:46","date_gmt":"2022-10-22T00:15:46","guid":{"rendered":"https:\/\/jassweb.com\/solved\/solved-php-average-by-group-of-n-elements-in-an-array\/"},"modified":"2022-10-22T05:45:46","modified_gmt":"2022-10-22T00:15:46","slug":"solved-php-average-by-group-of-n-elements-in-an-array","status":"publish","type":"post","link":"https:\/\/jassweb.com\/solved\/solved-php-average-by-group-of-n-elements-in-an-array\/","title":{"rendered":"[Solved] PHP average by group of n elements in an array"},"content":{"rendered":"

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First of all, you should redesign your data structure. You aggregate the values in strings in $values<\/code> and then it’s difficult to extract and use the individual components.<\/p>\n

$values = array();\nfor($i=1;$i<=$arrayCount;$i++){\n    $date = trim($allDataInSheet[$i][\"A\"]);\n    $dir = trim($allDataInSheet[$i][\"B\"]);\n    $sinvalue= sin(deg2rad($dir));\n    $cosvalue= cos(deg2rad($dir));            \n    $values[] = array(\n        'date' => $date,\n        'sin'  => $sinvalue,\n        'cos'  => $cosvalue,\n    );\n}\n<\/code><\/pre>\n
Now, several array functions<\/a> can be applied to do the job.<\/p>\n
PHP does not provide a function to compute the average for a list of numbers but it is not difficult to write one:<\/p>\n
function average(array $input)\n{\n    return array_sum($input) \/ count($input);\n}\n<\/code><\/pre>\n
Extract the values associated to 'sin'<\/code> in $values<\/code>, split the list in chunks of 5 items, apply the function average()<\/code> to each chunk. The result is a list of 288 values.<\/p>\n
$avg288 = array_map(\n    'average',\n    array_chunk(\n        array_column($values, 'sin'),\n        5\n    )\n);\n<\/code><\/pre>\n
Similar to above, split the list of 288 averages into 24 chunks of 12 values, apply average()<\/code> to each chunk, get a list of 24 numbers.<\/p>\n
$avg24 = array_map(\n    'average',\n    array_chunk(\n        $avg288,\n        12\n    )\n);\n<\/code><\/pre>\n
Read about array_sum()<\/code><\/a>, count()<\/code><\/a>, array_column()<\/code><\/a>, array_chunk()<\/code><\/a>, array_map()<\/code><\/a>.<\/p>\n
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Update<\/strong><\/p>\n
On PHP 5.4 array_column()<\/code><\/a> doesn’t work (because it was introduced in PHP 5.5.).<\/p>\n
In this case you can compute the array returned by array_column()<\/code><\/a> in the initial loop, where $values<\/code> is created:<\/p>\n
$values = array();\n$sins = array();\nfor($i=1;$i<=$arrayCount;$i++){\n    $date = trim($allDataInSheet[$i][\"A\"]);\n    $dir = trim($allDataInSheet[$i][\"B\"]);\n    $sinvalue= sin(deg2rad($dir));\n    $cosvalue= cos(deg2rad($dir));            \n    $values[] = array(\n        'date' => $date,\n        'sin'  => $sinvalue,\n        'cos'  => $cosvalue,\n    );\n    $sins[] = $sinvalue;\n}\n<\/code><\/pre>\n
The use $sins<\/code> instead of array_column($values, 'sin')<\/code> in the computation of $avg288<\/code>.<\/p>\n<\/p><\/div>\n
<\/div>\n<\/div>\n
            6<\/span> <\/p><\/div>\n<\/div>\n
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solved PHP average by group of n elements in an array <\/p>\n","protected":false},"excerpt":{"rendered":"
[ad_1] First of all, you should redesign your data structure. You aggregate the values in strings in $values and then it’s difficult to extract and use the individual components. $values = array(); for($i=1;$i<=$arrayCount;$i++){ $date = trim($allDataInSheet[$i][“A”]); $dir = trim($allDataInSheet[$i][“B”]); $sinvalue= sin(deg2rad($dir)); $cosvalue= cos(deg2rad($dir)); $values[] = array( ‘date’ => $date, ‘sin’ => $sinvalue, ‘cos’ => $cosvalue, … Read more<\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[320],"tags":[339],"class_list":["post-16805","post","type-post","status-publish","format-standard","hentry","category-solved","tag-php"],"yoast_head":"\n[Solved] PHP average by group of n elements in an array - JassWeb<\/title>\n<meta name=\"robots\" content=\"index, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<link rel=\"canonical\" href=\"https:\/\/jassweb.com\/solved\/solved-php-average-by-group-of-n-elements-in-an-array\/\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"[Solved] PHP average by group of n elements in an array - JassWeb\" \/>\n<meta property=\"og:description\" content=\"[ad_1] First of all, you should redesign your data structure. 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