矩阵主对角线下方的元素总和 python

Question

基本上我必须编写一个程序来创建一个 N × N 的矩阵并用随机数填充它并计算矩阵主对角线下方所有元素的总和。除了元素的总和，我已经做了所有的事情，这就是我所拥有的

import random

def llenar_matriz(n):
    # Fills the matrix with random numbers between 1 and 99
    for r in range(n):
        fila = []
        for c in range(n):
            fila.append(random.randint(1,99))
        matriz.append(fila)
    return matriz

def imprimir_matriz(matriz):
    # Prints the matrix properly (makes every list go below the previous one)
    filas = len(matriz)
    columnas = len(matriz[0])
    for f in range(filas):
        for c in range(columnas):
            print ("%3d" %matriz[f][c], end="")
        print()

def suma_matriz(matriz):
     #This should make the sum of all the values below the main diagonal of the matrix
   

# Programa principal
lado = int(input("Ingrese el ancho de la matriz: ")) #input value that makes the matrix N by N
matriz = []
llenar_matriz(lado)
imprimir_matriz(matriz)
total = suma_matriz()

print("La suma de los numeros debajo de la diagonal principal de la matriz es: ",total)

我需要帮助的是接收矩阵并对主对角线下方的所有值求和的函数

Answer 1

试试这个

import random

def llenar_matriz(n):
    # Fills the matrix with random numbers between 1 and 99
    matriz = []
    for r in range(n):
        fila = []
        for c in range(n):
            fila.append(random.randint(1,99))
        matriz.append(fila)
    return matriz

def imprimir_matriz(matriz):
    filas = len(matriz)
    columnas = len(matriz[0])
    for f in range(filas):
        for c in range(columnas):
            print ("%3d" % matriz[f][c], end="")
        print()


def suma_matriz(matriz):
     #This should make the sum of all the values below the main diagonal of the matrix
    sum = 0
    for i in range(len(matriz)):
        for j in range(len(matriz)):
            if i != j and i > j: 
                sum += matriz[i][j]
    return sum
   

# Programa principal
lado = int(input("Ingrese el ancho de la matriz: ")) #input value that makes the matrix N by N
matriz = llenar_matriz(lado)
imprimir_matriz(matriz)
total = suma_matriz(matriz)

print("La suma de los numeros debajo de la diagonal principal de la matriz es: ",total)

给出输出

Ingrese el ancho de la matriz: 5
77 22 19 46 77 
32 14 39  2 61 
92 26 54 56 92 
24 73 37 40 16 
27 34 51 35 39 
La suma de los numeros debajo de la diagonal principal de la matriz es:  431

矩阵主对角线下方的元素总和 python

Sum of elements below the main diagonal of a matrix python

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