C does not really have multi-dimensional arrays, but there are several ways to simulate them. The way to pass such arrays to a function depends on the way used to simulate the multiple dimensions: 1) Use an array of arrays. This can only be used if your array bounds are fully determined at compile time, … Read more
This is because a double[][] is an array of double[] which you can’t assign 0.0 to (it would be like doing double[] vector = 0.0). In fact, Java has no true multidimensional arrays. As it happens, 0.0 is the default value for doubles in Java, thus the matrix will actually already be filled with zeros … Read more
Taking a column is easy with the map function. // a two-dimensional array var two_d = [[1,2,3],[4,5,6],[7,8,9]]; // take the third column var col3 = two_d.map(function(value,index) { return value[2]; }); Why bother with the slice at all? Just filter the matrix to find the rows of interest. var interesting = two_d.filter(function(value,index) {return value[1]==5;}); // interesting … Read more
Just use a regular JavaScript object, which would ‘read’ the same way as your associative arrays. You have to remember to initialize them first as well. var obj = {}; obj[‘fred’] = {}; if(‘fred’ in obj ){ } // can check for the presence of ‘fred’ if(obj.fred) { } // also checks for presence of … Read more
$array = your array $result = call_user_func_array(‘array_merge’, $array); echo “<pre>”; print_r($result); REF: http://php.net/manual/en/function.call-user-func-array.php Here is another solution (works with multi-dimensional array) : function array_flatten($array) { $return = array(); foreach ($array as $key => $value) { if (is_array($value)){ $return = array_merge($return, array_flatten($value));} else {$return[$key] = $value;} } return $return; } $array = Your array $result = … Read more
array_merge() is more efficient but there are a couple of options: $array1 = array(“id1” => “value1”); $array2 = array(“id2” => “value2”, “id3” => “value3”, “id4” => “value4”); $array3 = array_merge($array1, $array2/*, $arrayN, $arrayN*/); $array4 = $array1 + $array2; echo ‘<pre>’; var_dump($array3); var_dump($array4); echo ‘</pre>’; // Results: array(4) { [“id1”]=> string(6) “value1” [“id2”]=> string(6) “value2” [“id3”]=> … Read more
Here’s a simple approach: Start at the bottom-left corner. If the target is less than that value, it must be above us, so move up one. Otherwise we know that the target can’t be in that column, so move right one. Goto 2. For an NxM array, this runs in O(N+M). I think it would … Read more
memset(array, 0, sizeof(array[0][0]) * m * n); Where m and n are the width and height of the two-dimensional array (in your example, you have a square two-dimensional array, so m == n).
a.mean() takes an axis argument: In [1]: import numpy as np In [2]: a = np.array([[40, 10], [50, 11]]) In [3]: a.mean(axis=1) # to take the mean of each row Out[3]: array([ 25. , 30.5]) In [4]: a.mean(axis=0) # to take the mean of each col Out[4]: array([ 45. , 10.5]) Or, as a standalone … Read more
Try something like: row.map((rank, i, row) => { if (i + 1 === row.length) { // Last one. } else { // Not last one. } }) Old answer: const rowLen = row.length; row.map((rank, i) => { if (rowLen === i + 1) { // last one } else { // not last one } … Read more