Question

Select the description(s) that result in a ragged 2-D (matrix) array instantiation.

(This means that directly after the described instantiation, the matrix will be a ragged array with some row lengths being different from other row lengths in the matrix, not a matrix in which all the row lengths in are the same.)

A. A NumPy 2-D array whose shape is described by a tuple, like (4, 8) or (3, 4), passed to the constructor.

B. A Python list-of-lists in which not all of the inner lists are the same length.

C. A Python list-of-lists in which all of the inner lists are the same length.

D. A NumPy 1-D array whose individual elements point to separate NumPy 1-D arrays (each of which might be a different length).

Answer 1

Option A):-A NumPy 2-D array whose shape is described by a tuple, like (4, B) ar (3, 4), passed ta the constructor [26] # importing numpy module as np mnumrpy as np # creating a 2d array "arr" whose shape is described by tuple (4, 8) arr np.ndarray(shape-(4, 8)) # print the shape print("shape is:"ar.shape) # print the matrix print("Matrix array is: ", arr) # Output ( Ne can see that output is a "4 by 8" 2d matrix which is not a ragged matrix) C Shape is: (4, 8) Matrix array is: [[2.982215e-316 θ.eeeeeee+eee e.eeeeeee+eee e.eeeeeee+eee θ.eeeeeee+eee 0.008000e+08e 0.008000e+080 8.00800e+0801 9.09800e+006 0.000009e+90 .008000e+0e01 8.008808e+080 8.008808e+00 8.008808+880 8.008008e+80 8.00008e+880 「e, eeeeeee+eee e.eeeeeee+eee e.eeeeeee+eee e.eeeeeee+eee e.eeeeeee+eee

Option B):-A Python list-of-lists in which not all of the inner lists are the samelength. [23] # creating python list-of-list in which not all of the inner lists are the same length. # printing the list-of-list printlist_of_list) # Output (we can see that output is ragged 2-0 (matrix) array) C [[1, 2, 3, 4]. [5, 6, 7]. [8, 9], [101] Option C):-A Python list-of-ists in which all of the inner lists are the same length. [24] # creating python list-of-list in which all of the inner lists are the same length. list of 1ist[[1, 2, 3], [4, 5, 6], [7, 8, 91] # printing the list-of list print (list_of_1ist) # Output (we can see that output is not ragged 2-D (matrix) array)

Option D):-A NumPy 1-D array whose individual elements point to separate NumPy 1-D arrays (each of which might be a different length) [44] # creating 1d array "arr" of size 5 and datatpe of objects arr - np.ndarray(shape-5, dtype-abject) # creating numpy ld arrays (some of the arrays are of same length) eleml-np.ndarray (shape-2) el㎝2 - np.ndarray(shape-1) elem3 np.ndarray(shape-3) elem4 np.ndarray(shape-3) el㎝5 - np.ndarray(shape. 7) # assign the elements to arr arr[11elem2 arr[2]- elemB arr[31-elem arr[4] = eler5 # print the array when not all elements are of different length print("Output array is(when not al1 elements are of different length): ", arr) # creating numpy ld arrays (all arrays are of different length) e1㎝1 . np.ndarray ( shape-1) elam2 np.ndarray(shape-2) elem3 np.ndarray(shape-3) elem4 - np.ndarray shape-4) elems np.ndarray(shape-5) # assign the elements to arr arr[11elem2 arr[ 21-elem3

arr [31 -elem4 arr 41 -elam5 # print the array when.all elements(arrays) are of different length(In this case output is ragged 2-D (matrix) array) print("\nOutput array İs(when all elements(arrays) are of different length): ", arr) output array is(when not all elements are of different length): array([2.5913237e-316, 3.3102398e-322]) array ([3.12378332e-33]) array([3.24824693e-316, 6.89860832e-310, 6.89870635e-310]) array([3.24924693e-316, 6.89860832e-310, 6.89870635e-310]) array([2.65782970e-316, 1.581010e 7e-322, 2.121995 79e-314, 1.39668225e-975, .58745291e-33, 5.99119637e+174, 3.12378332e-933])] output array Ls (when ali element s (arrays) are of địfferent length): [array([3.123 78332 e 331) array([2 5913237, 316. 3 3182398 array([3.24824693e-316, 6.89860832e-310, 6.89878635e-310]) array [S.e-324, 0.e+998, .e+809,9.e+900]) array([6.89868875e-310, 6.89868875e-310, 6.89868875e-310, 6.89868873e-310, 322 6.89868873e-310])] CONCLUSION:-Option (B) is correct and optian (D) is correct for the case when all elements of arr are of diifferent length