计算标准偏差。

实例

include

include

float calculateSD(float data[]);

int main()
{
int i;
float data[10];

printf("输入10个元素: ");
for(i=0; i < 10; ++i)
    scanf("%f", &data[i]);

printf("\n标准偏差 = %.6f", calculateSD(data));

return 0;

}

float calculateSD(float data[])
{
float sum = 0.0, mean, standardDeviation = 0.0;

int i;

for(i=0; i<10; ++i)
{
    sum += data[i];
}

mean = sum/10;

for(i=0; i<10; ++i)
    standardDeviation += pow(data[i] - mean, 2);

return sqrt(standardDeviation/10);

}

输出结果为：

输入10个元素: 1
2
3
4
5
6
7
8
9
10

标准偏差 = 2.872281