numpy string operations | rfind() function (original) (raw)

Last Updated : 23 Jan, 2019

numpy.core.defchararray.find(arr, sub, start=0, end=None) is another function for doing string operations in numpy.It returns the highest index in the string where substring sub is found for each element in arr.It returns -1 if sub is not contained within [start, end].

Parameters:
arr : array_like of str or unicode.
sub : [str or unicode] The substring which to be searched.
start : [ int, optional] The starting location in each string.
end : [ int, optional] The ending location in each string.

Returns : [ndarray] Output array of ints.

Code #1 :

import numpy as geek

in_arr = geek.array([ 'aAaAaA' , 'baA' , 'abBABba' ])

print ( "Input array : " , in_arr)

out_arr = geek.char.rfind(in_arr, sub = 'A' )

print ( "Output array: " , out_arr)

Output:

Input array : ['aAaAaA' 'baA' 'abBABba'] Output array: [5 2 3]

Code #2 :

import numpy as geek

in_arr = geek.array([ 'aAaAaA' , 'aA' , 'abBABba' ])

print ( "Input array : " , in_arr)

out_arr = geek.char.rfind(in_arr, sub = 'a' , start = 3 , end = 7 )

print ( "Output array: " , out_arr)

Output:

Input array : ['aAaAaA' 'aA' 'abBABba'] Output array: [ 4 -1 6]

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