You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
40 lines
756 B
40 lines
756 B
#include <stdio.h>
|
|
#include "MathFunctions.h"
|
|
#include "TutorialConfig.h"
|
|
|
|
#include <math.h>
|
|
|
|
// a hack square root calculation using simple operations
|
|
double mysqrt(double x)
|
|
{
|
|
if (x <= 0)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
double result;
|
|
|
|
// if we have both log and exp then use them
|
|
#if defined(HAVE_LOG) && defined (HAVE_EXP)
|
|
result = exp(log(x)*0.5);
|
|
fprintf(stdout,"Computing sqrt of %g to be %g using log\n",x,result);
|
|
#else
|
|
double delta;
|
|
result = x;
|
|
|
|
// do ten iterations
|
|
int i;
|
|
for (i = 0; i < 10; ++i)
|
|
{
|
|
if (result <= 0)
|
|
{
|
|
result = 0.1;
|
|
}
|
|
delta = x - (result*result);
|
|
result = result + 0.5*delta/result;
|
|
fprintf(stdout,"Computing sqrt of %g to be %g\n",x,result);
|
|
}
|
|
#endif
|
|
return result;
|
|
}
|