Question

Write a function hitRate(A, B) to return the percentage of elements in array A that match the elements with the same index in array B. A and B are 1darrays or 2darrays of the same shape. Sample: if X = np.array([1, 3, 5, 8]); Y = np.array([2, 1, 3, 8]), then hitRate(X, Y) returns 0.25. in python program

Answer 1

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Note : check attached image for output and indentation . code compiled and tested in spyder python 3.

Program Plan :

1. inside hit rate function
2. first check numpy array is 2d or 1d using arrayName.ndim
3. if array is 2d than run two loop and one outer loop and inner loop .
4. when we traverse each element in array increment length so we after loop we have number of element in 2d array .
5. inside inner loop if element of A and B same increment count
6. now we have total element in 2d array and number of elements same in array (for same index)
7. now calculate percentage = number of elements same*100/total elements

If Array is 1 dimensional :

1. get length of array in length variable
2. now run a loop from first element to last element of 1d array
3. if A[i]==B[i] same increment count
4. after loop ends
5. calculate percentage = number of element same *100 /length of 1d array

Program :

import numpy #import numpy array

#function takes two numpy array A and B
#both are 2d or 1d
def hitRate(A,B):
    dim=A.ndim #get number of dimensional
    count=0   #count number of element same
    length=0 #total element
    if dim==2: #if array is 2D
        #run loop for first to last column
        for i in range(len(A)):
            for j in range(len(A[i])): #run a loop from 0 to last column element
                length+=1 #increment number of elements
                if A[i][j]==B[i][j]: #if both element are same
                    count+=1 #increment count
    elif dim==1:#if array is 1D
        length=len(A)#get length of array
        #from 1st to last element
        for i in range(len(A)):
            if A[i]==B[i]: #if element same
                count+=1 #increment count
    #calculate percentage
    percentage=count*100/length
    return percentage #return
      
      
      
if __name__=="__main__":
    arr = numpy.array([[1, 3, 5,8],[3,4,5,8]])
    arr1 =numpy.array([[3,4,5,2],[1, 3, 5,8]])
    print("Hit percentage : ",hitRate(arr, arr1))
  
    arr2 = numpy.array([1, 3, 5,8])
    arr3 =numpy.array([3,4,5,8])
    print("Hit Percentage : ",hitRate(arr2, arr3))
           

Output :

Program :

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