multidimensional-array

问题 This doesn't work program main implicit none integer :: nx = 3 integer :: ny = 5 integer :: nz = 8 real, allocatable, dimension(:,:,:) :: A real, allocatable, dimension(:,:) :: B allocate(A(nx,0:ny,nz) ) ! ...do something with array A and at some point cope a slice of A to B: B = A(:,:,1) ! in this case B is (1:nx, 1: ny+1) end program main The code above automatically allocates B and copies A(:,:,1) to B. However it doesn't keep the lower/upper bound of 0/ny, instead B has its lower bound to

问题 I have a created a numpy array, each element of the array contains an array of the same shape (9,5). What I want is a 3D array. I've tried using np.stack. data = list(map(lambda x: getKmers(x, 9), data)) # getKmers creates a # list of list from a pandas dataframe data1D = np.array(data) # shape (350,) data2D = np.stack(data1D) data1D: array([list([ pdbID AtomNo Type Eta Theta 0 1a9l.pdb 2.0 G 169.225 212.838 1 1a9l.pdb 3.0 G 168.439 206.785 2 1a9l.pdb 4.0 U 170.892 205.845 3 1a9l.pdb 5.0 G

问题 I have a created a numpy array, each element of the array contains an array of the same shape (9,5). What I want is a 3D array. I've tried using np.stack. data = list(map(lambda x: getKmers(x, 9), data)) # getKmers creates a # list of list from a pandas dataframe data1D = np.array(data) # shape (350,) data2D = np.stack(data1D) data1D: array([list([ pdbID AtomNo Type Eta Theta 0 1a9l.pdb 2.0 G 169.225 212.838 1 1a9l.pdb 3.0 G 168.439 206.785 2 1a9l.pdb 4.0 U 170.892 205.845 3 1a9l.pdb 5.0 G

问题 I have looked through a few answers on here but that don't seem to utilise this method? I have an array of items, and the items are objects. The object can have a key which is 'children' and 'children' is an array of objects etc. Is there a way to achieve this? Example: Array ( [1] => stdClass Object ( [id] => 1 [name] => Steve King [image] => upload/shop/fe7a66254e4249af2b0093efca75a914.jpg [parent] => 0 [children] => Array ( ) ) [2] => stdClass Object ( [id] => 2 [name] => Eden Hall [image]

问题 I have looked through a few answers on here but that don't seem to utilise this method? I have an array of items, and the items are objects. The object can have a key which is 'children' and 'children' is an array of objects etc. Is there a way to achieve this? Example: Array ( [1] => stdClass Object ( [id] => 1 [name] => Steve King [image] => upload/shop/fe7a66254e4249af2b0093efca75a914.jpg [parent] => 0 [children] => Array ( ) ) [2] => stdClass Object ( [id] => 2 [name] => Eden Hall [image]

问题 i was going through pytorch tutorial and came across pytorch.empty function. it was mentioned that empty can be used for uninitialized data . But, when i printed it, i got a value. what is the difference between this and pytorch.rand which also generates data(i know that rand generates between 0 and 1). Below is the code i tried a = torch.empty(3,4) print(a) Output: tensor([[ 8.4135e-38, 0.0000e+00, 6.2579e-41, 5.4592e-39], [-5.6345e-08, 2.5353e+30, 5.0447e-44, 1.7020e-41], [ 1.4000e-38, 5

问题 i was going through pytorch tutorial and came across pytorch.empty function. it was mentioned that empty can be used for uninitialized data . But, when i printed it, i got a value. what is the difference between this and pytorch.rand which also generates data(i know that rand generates between 0 and 1). Below is the code i tried a = torch.empty(3,4) print(a) Output: tensor([[ 8.4135e-38, 0.0000e+00, 6.2579e-41, 5.4592e-39], [-5.6345e-08, 2.5353e+30, 5.0447e-44, 1.7020e-41], [ 1.4000e-38, 5

问题 I am trying to make an Array extension in Swift 3.1.1 that supports the addition of an object to a certain index in a 2D Array even if the array hasn't been populated yet . The extension should also provide the ability to get an object at certain indexPath . I have the code for this in Swift 2 but I don't seem to be able to migrate it to Swift 3. This is the Swift 2 code: extension Array where Element: _ArrayProtocol, Element.Iterator.Element: Any { mutating func addObject(_ anObject :

问题 Pardon the confusing question title, but I was unsure how to phrase it more clearly. In C, accessing an array out of bounds is classified as undefined behavior. However, array elements are guaranteed to be laid out contiguously in memory, and the array subscript operator is syntactic sugar for pointer arithmetic (e.g x[3] == *(x + 3) ). Therefore, I would personally expect the behavior of the code below to be well-defined: int array[10][10]; int i = array[0][15]; // i == array[1][5]? If my

问题 How to remove leading / trailing zeros from a NumPy array? Trim_zeros works only for 1D. 回答1: The following function works for any dimension: def trim_zeros(arr, margin=0): ''' Trim the leading and trailing zeros from a N-D array. :param arr: numpy array :param margin: how many zeros to leave as a margin :returns: trimmed array :returns: slice object ''' s = [] for dim in range(arr.ndim): start = 0 end = -1 slice_ = [slice(None)]*arr.ndim go = True while go: slice_[dim] = start go = not np