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fix bug #5599

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solves equations more correctly, eliminates “nan” error.
This commit is contained in:
Viet Dinh 2015-11-01 23:30:28 -05:00
parent fdf549b921
commit 0bc44376a5
1 changed files with 36 additions and 2 deletions
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38
modules/core/src/mathfuncs.cpp
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@ -2495,7 +2495,7 @@ double cv::solvePoly( InputArray _coeffs0, OutputArray _roots0, int maxIters )
coeffs[i] = C(rcoeffs[i], 0);
}
C p(1, 0), r(0.4, 0.9);
C p(1, 0), r(1, 1);
for( i = 0; i < n; i++ )
{
@ -2511,12 +2511,46 @@ double cv::solvePoly( InputArray _coeffs0, OutputArray _roots0, int maxIters )
{
p = roots[i];
C num = coeffs[n], denom = coeffs[n];
int num_same_root = 1;
for( j = 0; j < n; j++ )
{
num = num*p + coeffs[n-j-1];
if( j != i ) denom = denom * (p - roots[j]);
if( j != i )
{
if ( (p - roots[j]).re != 0 || (p - roots[j]).im != 0 )
denom = denom * (p - roots[j]);
else
num_same_root++;
}
}
num /= denom;
if( num_same_root > 1)
{
for( j = 0; j < num_same_root / 2; j++)
{
double old_num_re = num.re;
double old_num_im = num.im;
num.re = old_num_re*old_num_re + old_num_im*old_num_im;
Mat num_re_arr = (Mat_<double>(1,1) << num.re);
cv::sqrt(num_re_arr, num_re_arr);
num.re = num_re_arr.at<double>(0, 0);
num.re += old_num_re;
num.im = num.re - old_num_re;
num.re /= 2;
num_re_arr.at<double>(0, 0) = num.re;
cv::sqrt(num_re_arr, num_re_arr);
num.re = num_re_arr.at<double>(0, 0);
Mat num_im_arr = (Mat_<double>(1,1) << num.im);
num.im /= 2;
num_im_arr.at<double>(0, 0) = num.re;
cv::sqrt(num_im_arr, num_im_arr);
num.im = num_im_arr.at<double>(0, 0);
if( old_num_re < 0 ) num.im = -num.im;
}
}
roots[i] = p - num;
maxDiff = max(maxDiff, abs(num));
}