By this discription about Blittable and Non-Blittable Types in the link below you could try the System.Double in place of float, because they do not require conversion when they are passed between managed and unmanaged code wich means no more special handling by the interop marshaler with a plus in performance: https://msdn.microsoft.com/en-us/library/75dwhxf7%28v=vs.110%29.aspx I did a … Read more
Yes, you should iterate over 2D boolean array in order to deep copy it. Also look at java.util.Arrays#copyOf methods if you are on Java 6. I would suggest the next code for Java 6: public static boolean[][] deepCopy(boolean[][] original) { if (original == null) { return null; } final boolean[][] result = new boolean[original.length][]; for … Read more
Bash does not support multidimensional arrays, nor hashes, and it seems that you want a hash that values are arrays. This solution is not very beautiful, a solution with an xml file should be better : array=(‘d1=(v1 v2 v3)’ ‘d2=(v1 v2 v3)’) for elt in “${array[@]}”;do eval $elt;done echo “d1 ${#d1[@]} ${d1[@]}” echo “d2 ${#d2[@]} … Read more
Multidimensional arrays aren’t enumerable. Just iterate the good old-fashioned way: for (int i = 0; i < table.GetLength(0); i++) { Console.WriteLine(table[i, 0] + ” ” + table[i, 1]); }
In Rust 1.0, the following works: let mut state = [[0u8; 4]; 6]; state[0][1] = 42; Note that the length of the interior segment is an integral part of the type. For example, you can reference (and pass) state as follows: let a: &[[u8; 4]] = &state; but not without specifying the fixed length of … Read more
Since PostgreSQL 9.1 There is the convenient FOREACH which can loop over slices of arrays. The manual: The target variable must be an array, and it receives successive slices of the array value, where each slice is of the number of dimensions specified by SLICE. DO $do$ DECLARE m text[]; arr text[] := ‘{{key1,val1},{key2,val2}}’; — … Read more
This code returns a 2d array. #include <cstdio> // Returns a pointer to a newly created 2d array the array2D has size [height x width] int** create2DArray(unsigned height, unsigned width) { int** array2D = 0; array2D = new int*[height]; for (int h = 0; h < height; h++) { array2D[h] = new int[width]; for (int … Read more
Method #1: use None (or np.newaxis) to add an extra dimension so that broadcasting will behave: >>> e array([[ 0., 1.], [ 2., 4.], [ 1., 5.]]) >>> e/e.sum(axis=1)[:,None] array([[ 0. , 1. ], [ 0.33333333, 0.66666667], [ 0.16666667, 0.83333333]]) Method #2: go transpose-happy: >>> (e.T/e.sum(axis=1)).T array([[ 0. , 1. ], [ 0.33333333, 0.66666667], [ … Read more
You can use key(): <?php $array = array( “one” => 1, “two” => 2, “three” => 3, “four” => 4 ); while($element = current($array)) { echo key($array).”\n”; next($array); } ?>
You can get the index [0] from each element in a list comprehension >>> [i[0] for i in a] [4.0, 3.0, 3.5]