made Calculation for Task 3c

Schenk_Brandenberger_S8_Aufg3.py

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+import numpy as np
+
+
+def switchRows(matrix, row1, row2):
+    matrix[[row1, row2]] = matrix[[row2, row1]]
+    return matrix
+
+def Schenk_Brandenberger_S6_Aufg2(A, b):
+
+    def calculateRow(A, b, row, column):
+        b[row] = [b[row][0] - (A[row][column] / A[column][column]) * b[column][0]]
+        A[row] = [(A[row][i] - (A[row][column] / A[column][column]) * A[column][i]) for i in range(len(A[row]))]
+        return A, b
+
+    # Erstelle obere Dreiecksmatrix
+    countRowSwitch = 0
+    columnsToEdit = []
+    for row in range(1, len(A)):
+        columnsToEdit.append(row - 1)
+        for column in columnsToEdit:
+            if(A[row-1][column] == 0 and (row - 1 == column)):
+                rowToSwitch = row
+                if(row == 1):
+                    while(A[rowToSwitch][column] == 0):
+                        if(len(A) > rowToSwitch + 1):
+                            rowToSwitch += 1
+                        else:
+                            return "Matrix ist nicht regulär!"
+                A = switchRows(A, row - 1, rowToSwitch)
+                b = switchRows(b, row - 1, rowToSwitch)
+                countRowSwitch += 1
+            else:
+                A, b = calculateRow(A, b, row, column)
+    #print("\nObere Dreiecksmatrix A:\n", A, "\nb:\n", b)
+
+    # Rückwärtseinsetzen
+    columnsToEdit = []
+    for row in range((len(A) - 2), -1, -1):
+        columnsToEdit.append(row + 1)
+        for column in columnsToEdit:
+            A, b = calculateRow(A, b, row, column)
+        row -= 1
+    #print("\nA:\n", A, "\nb:\n", b)
+
+    det = 1
+    result = []
+    for i in range(len(A)):
+        result.append(b[i][0] / A[i][i])
+        det *= A[i][i]
+    if(countRowSwitch % 2 == 1):
+        det *= (-1)
+    return result, det
+
+
+
+if __name__ == '__main__':
+    # Zahlen von Serie 7 Aufgabe 1c
+    # A = np.array([[20000.0, 30000.0, 10000.0],
+    #                [10000.0, 17000.0, 6000.0],
+    #                [2000.0, 3000.0, 2000.0]])
+    #
+    # b = np.array([[5720000.0],
+    #                [3300000.0],
+    #                [836000.0]])
+
+    # Aufgabe 3c
+    A = np.array([[20000.0 - 100.0, 30000.0 - 100.0, 10000.0 - 100.0],
+                   [10000.0 - 100.0, 17000.0 - 100.0, 6000.0 - 100.0],
+                   [2000.0 - 100.0, 3000.0 - 100.0, 2000.0 - 100.0]])
+
+    b = np.array([[5720000.0 + 100000.0],
+                   [3300000.0 + 100000.0],
+                   [836000.0 + 100000.0]])
+
+    result, det = Schenk_Brandenberger_S6_Aufg2(A, b)
+    print("Ergebnis:")
+    for i in range(len(result)):
+        print("x" + str(i) + ": " + str(result[i]))
+    print("Determinante: " + str(det))