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Apply accumulate for a multi-dimensional array along axis 0 in Numpy
To Accumulate the result of applying the operator to all elements, use the numpy.accumulate() method in Python Numpy. For a multi-dimensional array, accumulate is applied along only one axis. We will apply along axis 0.
The numpy.ufunc has functions that operate element by element on whole arrays. The ufuncs are written in C (for speed) and linked into Python with NumPy's ufunc facility. A universal function (or ufunc for short) is a function that operates on ndarrays in an element-by-element fashion, supporting array broadcasting, type casting, and several other standard features. That is, a ufunc is a "vectorized" wrapper for a function that takes a fixed number of specific inputs and produces a fixed number of specific outputs.
Steps
At first, import the required library −
import numpy as np
Create a 2d array. The numpy.eye() returns a 2-D array with 1's as the diagonal and 0's elsewhere −
arr = np.eye(3)
Display the array −
print("Array...\n", arr)
Get the type of the masked array −
print("\nOur Array type...\n", arr.dtype)
Get the dimensions of the Masked Array −
print("\nOur Array Dimensions...\n",arr.ndim)
To Accumulate the result of applying the operator to all elements, use the numpy.accumulate() method in Python Numpy. For a multi-dimensional array, accumulate is applied along only one axis −
Add accumulate: Accumulate along axis 0 (rows) −
print("\nAdd accumulate...\n",np.add.accumulate(arr, 0))
Multiply accumulate −
print("\nMultiply accumulate...\n",np.multiply.accumulate(arr, 0))
Example
import numpy as np # The numpy.ufunc has functions that operate element by element on whole arrays. # ufuncs are written in C (for speed) and linked into Python with NumPy's ufunc facility # Create a 2d array # The numpy.eye() returns a 2-D array with 1's as the diagonal and 0's elsewhere. arr = np.eye(3) # Display the array print("Array...\n", arr) # Get the type of the masked array print("\nOur Array type...\n", arr.dtype) # Get the dimensions of the Masked Array print("\nOur Array Dimensions...\n",arr.ndim) # To Accumulate the result of applying the operator to all elements, use the numpy.accumulate() method in Python Numpy # For a multi-dimensional array, accumulate is applied along only one axis # Add accumulate # Accumulate along axis 0 (rows) # Add accumulate print("\nAdd accumulate...\n",np.add.accumulate(arr, 0)) # Multiply accumulate print("\nMultiply accumulate...\n",np.multiply.accumulate(arr, 0))
Output
Array... [[1. 0. 0.] [0. 1. 0.] [0. 0. 1.]] Our Array type... float64 Our Array Dimensions... 2 Add accumulate... [[1. 0. 0.] [1. 1. 0.] [1. 1. 1.]] Multiply accumulate... [[1. 0. 0.] [0. 0. 0.] [0. 0. 0.]]
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