Question

如何用分段线性插值求某个函数值?

Answer 1

#include

void main()

{

double x[6] = {0.0,0.1,0.195,0.3,0.401,0.5};

double f[6] = {0.39894,0.39695,0.39142,0.38138,0.36812,0.35206};

double input;

double output;

scanf("%lf",&input);

int i;

for (i = 0; i < 5; i++)

{

if (x[i] = input)

{

output = (f[i] * x[i] + f[i + 1] * x[i + 1]) / (x[i] + x[i + 1]);

break;

}

}

printf("%lfn",output);

}