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better termination check

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This commit is contained in:
Krishna Vedala 2020-04-09 15:51:24 -04:00
parent c27e045790
commit 7a7858a7fb
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GPG Key ID: BA19ACF8FC8792F7
1 changed files with 10 additions and 7 deletions
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17
numerical_methods/durand_kerner_roots.c
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@ -38,10 +38,13 @@ const char *complex_str(long double complex x)
return msg;
}
double get_rand(double lim)
char check_termination(long double delta)
{
const double max = fabs(lim), min = -max;
return (double)rand() / (double)RAND_MAX * (max - min + 1.0);
static long double past_delta = INFINITY;
if (fabsl(past_delta - delta) <= ACCURACY || delta < ACCURACY)
return 1;
past_delta = delta;
return 0;
}
/***
@ -130,7 +133,7 @@ int main(int argc, char **argv)
double tol_condition = 1;
unsigned long iter = 0;
while (tol_condition > ACCURACY && iter < INT_MAX)
while (!check_termination(tol_condition) && iter < INT_MAX)
{
long double complex delta = 0;
tol_condition = 0;
@ -152,19 +155,19 @@ int main(int argc, char **argv)
if (isnan(cabsl(delta)) || isinf(cabsl(delta)))
{
printf("Overflow/underrun error - got value = %Lg\n", cabsl(delta));
printf("\n\nOverflow/underrun error - got value = %Lg", cabsl(delta));
goto end;
}
s0[n] -= delta;
tol_condition += fabsl(cabsl(delta));
tol_condition = fmaxl(tol_condition, fabsl(cabsl(delta)));
#if defined(DEBUG) || !defined(NDEBUG)
fprintf(log_file, "%s,", complex_str(s0[n]));
#endif
}
tol_condition /= (degree - 1);
// tol_condition /= (degree - 1);
if (iter % 500 == 0)
{