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-rw-r--r--libdimension/polynomial.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/libdimension/polynomial.c b/libdimension/polynomial.c
index f361d38..32dd922 100644
--- a/libdimension/polynomial.c
+++ b/libdimension/polynomial.c
@@ -80,7 +80,7 @@ dmnsn_real_degree(double poly[], size_t degree)
static inline double
dmnsn_improve_root(double poly[], size_t degree, double x)
{
- double error;
+ double dx;
do {
/* Calculate the value of the polynomial and its derivative at once */
double p = poly[degree], dp = 0.0;
@@ -89,10 +89,9 @@ dmnsn_improve_root(double poly[], size_t degree, double x)
p = p*x + poly[i];
}
- double dx = p/dp;
- error = fabs(dx/x);
+ dx = p/dp;
x -= dx;
- } while (error > dmnsn_epsilon);
+ } while (fabs(dx) > dmnsn_epsilon);
return x;
}