[英]User defined input for matrix calculation program in Python
我已經寫下了最終目標的“硬編碼”版本。 如您所見,我有一個特定的n值以及預定義的矩陣X和Y。該程序目前可以正常執行計算,但是我遇到的麻煩是修改它以接受用戶定義的n輸入, X和Y,並根據用戶輸入的內容准確執行計算。 我仍然習慣於Python和用戶輸入,因此在編碼方面的任何幫助將不勝感激! 我還應注意,出於學習目的,我正在嘗試不使用NumPy進行此操作。 謝謝!
# Program to add two matrices
# using nested loop
n = 3
X = [[12,7,3],
[4 ,5,6],
[7 ,8,9]]
Y = [[5,8,1],
[6,7,3],
[4,5,9]]
result = [[0,0,0],
[0,0,0],
[0,0,0]]
# adds the matrices
# iterate through rows
for i in range(len(X)):
# iterate through columns
for j in range(len(X[0])):
result[i][j] = X[i][j] + Y[i][j]
for r in result:
print(r)
# subtracts the matrices
for i in range(len(X)):
for j in range(len(X[0])):
result[i][j] = X[i][j] - Y[i][j]
for r in result:
print(r)
# multiplies the matrices
for i in range(len(X)):
# iterate through columns
for j in range(len(X[0])):
result[i][j] = sum((X[i][v]*Y[v][j] for v in range(n)))
for r in result:
print(r)
也許這會有所幫助。 首先,您從用戶那里得到n,然后讀取X矩陣的n行數。 每行中的值用逗號分隔。
n = int(input("Provide n: "))
X = [];
for rowi in range(n):
row_list = list(map(float, input("row {}: ".format(rowi+1)).split(',')))
X.append(row_list)
print(X)
請注意,這已在python 3.4中進行了測試,此處沒有任何錯誤檢查。 因此,可能您需要添加一些條件來檢查用戶輸入是否為數字,而不是字符串,例如,每行是否具有相同數量的條目等。
因為我們知道matrx可以在Python中表示為嵌套列表,所以我們可以提示用戶輸入每個元素。同一行中的元素首先包含在名為row []的列表中,然后附加到容器列表中,因此我們得到容器列表內的列表,因此也包含矩陣。
#Prints the sum of matrix of orders mxn
first_row_count = int(input('Enter the number of rows of 1st matrix :'))
first_col_count = int(input('Enter the number of columns of 1st matrix :'))
second_row_count = int(input('Enter the number of rows of 1st matrix :'))
second_col_count = int(input('Enter the number of columns of 1st matrix :'))
first_Matrix =[]
second_matrix=[]
if(first_row_count == second_row_count) and (second_row_count == second_col_count):
print('############Enter the elements of first Matrix#################')
for i in range(0,first_row_count):
row = []
input_variable = None
for j in range(0,first_col_count):
input_variable = int(input('Enter the element at mat[{0}][{1}]'.format(i,j)))
row.append(input_variable)
first_Matrix.append(row)
print('############Enter the elements of second Matrix#################')
for i in range(0,second_row_count):
row = []
input_variable = None
for j in range(0,second_col_count):
input_variable = int(input('Enter the element at mat[{0}][{1}]'.format(i,j)))
row.append(input_variable)
second_matrix.append(row)
print('############Resultant Matrix#################')
result = [[first_Matrix[i][j] + second_matrix[i][j] for j in range(len(first_Matrix[0]))] for i in range(len(first_Matrix))]
for r in result:
print(r)
else:
print('------------The matrix of given orders are not compatible-----------------')
print('########The Matrix Sum performed##################')
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