写一个函数,用地址传递二维数组给函数,返回 两个一维数组,分别是这个二维数组的各行均值 Char c130]. 和方差。在主函数中输入行数和列数、以及一个二维数组数据,调用这个函数后,输出各行的均 huts (o), ges(cr, 值和方差。
时间: 2024-05-21 15:12:51 浏览: 92
好的,这是一个比较技术性的问题。我可以给您提供一个解决方案,您可以将以下代码添加到您的程序中:
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
void calc_row_stats(double **arr, int rows, int cols, double *mean_arr, double *var_arr){
// 计算每行的平均值和方差
for(int i=0; i<nbsp;rows; i++){
double row_sum = 0;
for(int j=0; j<nbsp;cols; j++){
row_sum += arr[i][j];
}
double row_mean = row_sum / cols;
mean_arr[i] = row_mean;
double row_var = 0;
for(int j=0; j<nbsp;cols; j++){
row_var += pow(arr[i][j]-row_mean, 2);
}
var_arr[i] = row_var / cols;
}
}
int main(){
int rows, cols;
printf("请输入行数和列数:\n");
scanf("%d%d", &rows, &cols);
// 分配内存
double **arr = (double**)malloc(rows*sizeof(double*));
for(int i=0; i<nbsp;rows; i++){
arr[i] = (double*)malloc(cols*sizeof(double));
}
double *mean_arr = (double*)malloc(rows*sizeof(double));
double *var_arr = (double*)malloc(rows*sizeof(double));
// 读取数据
printf("请输入二维数组数据:\n");
for(int i=0; i<nbsp;rows; i++){
for(int j=0; j<nbsp;cols; j++){
scanf("%lf", &arr[i][j]);
}
}
// 计算每行的平均值和方差
calc_row_stats(arr, rows, cols, mean_arr, var_arr);
// 输出结果
printf("各行的均值和方差分别为:\n");
for(int i=0; i<nbsp;rows; i++){
printf("第%d行:均值=%.2f,方差=%.2f\n", i+1, mean_arr[i], var_arr[i]);
}
// 释放内存
for(int i=0; i<nbsp;rows; i++){
free(arr[i]);
}
free(arr);
free(mean_arr);
free(var_arr);
return 0;
}
希望这个代码对您有所帮助!
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