numpy.percentile[]function used to compute the nth percentile of the given data [array elements] along the specified axis.
Syntax : numpy.percentile[arr, n, axis=None, out=None]
Parameters :
arr :input array.
n : percentile value.
axis : axis along which we want to calculate the percentile value. Otherwise, it will consider arr to be flattened[works on all the axis]. axis = 0 means along the column and axis = 1 means working along the row.
out :Different array in which we want to place the result. The array must have same dimensions as expected output.
Return :nth Percentile of the array [a scalar value if axis is none]or array with percentile values along specified axis.
Code #1 : Working
Python
import numpy as np
arr = [20, 2, 7, 1, 34]
print["arr : ", arr]
print["50th percentile of arr : ",
np.percentile[arr, 50]]
print["25th percentile of arr : ",
np.percentile[arr, 25]]
print["75th percentile of arr : ",
np.percentile[arr, 75]]
Output :
arr : [20, 2, 7, 1, 34] 50th percentile of arr : 7.0 25th percentile of arr : 2.0 75th percentile of arr : 20.0
Code #2 :
Python
import numpy as np
arr = [[14, 17, 12, 33, 44],
[15, 6, 27, 8, 19],
[23, 2, 54, 1, 4,]]
print["\narr : \n", arr]
print["\n50th Percentile of arr, axis = None : ",
np.percentile[arr, 50]]
print["0th Percentile of arr, axis = None : ",
np.percentile[arr, 0]]
print["\n50th Percentile of arr, axis = 0 : ",
np.percentile[arr, 50, axis =0]]
print["0th Percentile of arr, axis = 0 : ",
np.percentile[arr, 0, axis =0]]
Output :
arr : [[14, 17, 12, 33, 44], [15, 6, 27, 8, 19], [23, 2, 54, 1, 4]] 50th Percentile of arr, axis = None : 15.0 0th Percentile of arr, axis = None : 1.0 50th Percentile of arr, axis = 0 : [15. 6. 27. 8. 19.] 0th Percentile of arr, axis = 0 : [14. 2. 12. 1. 4.] 50th Percentile of arr, axis = 1 : [17. 15. 4.] 0th Percentile of arr, axis = 1 : [12. 6. 1.]
Code #3 :
Python
import numpy as np
arr = [[14, 17, 12, 33, 44],
[15, 6, 27, 8, 19],
[23, 2, 54, 1, 4,]]
print["\narr : \n", arr]
print["\n50th Percentile of arr, axis = 1 : ",
np.percentile[arr, 50, axis =1]]
print["0th Percentile of arr, axis = 1 : ",
np.percentile[arr, 0, axis =1]]
print["\n0th Percentile of arr, axis = 1 : \n",
np.percentile[arr, 50, axis =1, keepdims=True]]
print["\n0th Percentile of arr, axis = 1 : \n",
np.percentile[arr, 0, axis =1, keepdims=True]]
Output :
arr : [[14, 17, 12, 33, 44], [15, 6, 27, 8, 19], [23, 2, 54, 1, 4]] 0th Percentile of arr, axis = 1 : [[17.] [15.] [ 4.]] 0th Percentile of arr, axis = 1 : [[12.] [ 6.] [ 1.]]