111

228-15.py

@@ -33,7 +33,7 @@ def Inverse(A):
             minor = [row[:j] + row[j+1:] for row in (A[:i] + A[i+1:])]
             B[j][i] = ((-1) ** (i + j)) * sum(minor[k][l] * (-1) ** (k + l) for k in range(n - 1) for l in range(n - 1))
     det = Det(A)
-    print(det)
+    print("det(A):",det)
     if det == 0:
         print("矩阵不可逆")
         return None
@@ -45,17 +45,18 @@ def Cond(A,v):
     print(inv_A,Norm(A, v), Norm(inv_A, v))
     return Norm(A, v) * Norm(inv_A, v)
 
-
+#把矩阵换成题干的矩阵#########################
 if __name__ == "__main__":
     A = [
         [1,2],
         [1.001,2.001]
     ]
-
+#把范数的种类数换成题干的要求，inf是无穷范数#########################
     print(f"矩阵A的条件数为: {Cond(A, float('inf')):.5f}")
-
+#把矩阵换成题干的矩阵#########################
     A = [
         [1,2],
         [3,4]
     ]
+#把范数的种类数换成题干的要求，inf是无穷范数########################
     print(f"矩阵A的条件数为: {Cond(A, float('inf')):.5f}")