Replace keys in an array based on another lookup/mapping array
$arr[$newkey] = $arr[$oldkey]; unset($arr[$oldkey]);
$arr[$newkey] = $arr[$oldkey]; unset($arr[$oldkey]);
The definition of asarray is: def asarray(a, dtype=None, order=None): return array(a, dtype, copy=False, order=order) So it is like array, except it has fewer … Read more
That is the wrong mental model for using NumPy efficiently. NumPy arrays are stored in contiguous blocks of memory. To append rows or … Read more
No, it is blocking. Have a look at the specification of the algorithm. However a maybe easier to understand implementation is given on … Read more
With array_intersect_key and array_flip: var_dump(array_intersect_key($my_array, array_flip($allowed))); array(1) { [“foo”]=> int(1) }
If you’re using ruby 1.8.7 or 1.9, you can use the fact that iterator methods like each_with_index, when called without a block, return … Read more
if (typeof image_array !== ‘undefined’ && image_array.length > 0) { // the array is defined and has at least one element } Your … Read more
How to get the last element of an array without deleting it?
variable = [] Now variable refers to an empty list*. Of course this is an assignment, not a declaration. There’s no way to … Read more
To access column 0: >>> test[:, 0] array([1, 3, 5]) To access row 0: >>> test[0, :] array([1, 2]) This is covered in … Read more