Python中用於矩陣計算程序的用戶定義輸入

Question

我已經寫下了我的最終目標的「硬編碼」版本。正如你所看到的，對於n以及預定義的矩陣X和Y，我有一個特定的值。程序當前正在執行計算，但是我遇到的麻煩是將其修改爲接受用戶爲n定義的輸入， X和Y，並根據用戶輸入的內容準確執行計算。我仍然習慣Python和用戶輸入，所以任何編程幫助將不勝感激！我也應該注意到，我正在努力做到這一點沒有NumPy的學習目的。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) 

Answer 1

也許這會有所幫助。首先你得到一個用戶的n，並且讀取X個矩陣的n行。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，這是在Python 3.4測試，並有沒有檢查這裏的任何錯誤。所以可能你需要添加一些條件來檢查用戶輸入是否是數字，例如不是字符串，並且每行有相同數量的條目等。

Answer 2

因爲我們知道matrx可以表示爲Python中的嵌套列表，我們可以提示每個元素的用戶輸入。同一行中的元素首先被包含在名爲row []的列表中，然後它被附加到容器列表中，因此我們得到容器列表中的列表，因此得到矩陣。

#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##################')