diff options
Diffstat (limited to '2.3-1/src/c/specialFunctions/erfinv/derfinvs.c')
| -rw-r--r-- | 2.3-1/src/c/specialFunctions/erfinv/derfinvs.c | 16 |
1 files changed, 8 insertions, 8 deletions
diff --git a/2.3-1/src/c/specialFunctions/erfinv/derfinvs.c b/2.3-1/src/c/specialFunctions/erfinv/derfinvs.c index 379d6af5..3f7fe761 100644 --- a/2.3-1/src/c/specialFunctions/erfinv/derfinvs.c +++ b/2.3-1/src/c/specialFunctions/erfinv/derfinvs.c @@ -19,31 +19,31 @@ double derfinvs (double inp1) { - double a[] = {0.88622692374517353,-1.6601283962374516,0.92661860147244357,-0.14110320437680104}; - double b[] = {-2.13505380615258078,1.46060340345661088,-0.33198239813321595,0.01197270616590528}; - double c[] = {-1.994216456587148,-1.87267416351196,3.60874665878559364,1.82365845766309853}; - double d[] = {3.74146294065960872,1.81848952562894617}; + double a[] = {0.88622692374517353,-1.6601283962374516,0.92661860147244357,-0.14110320437680104}; //Coefficients for the formula to calculate inverse error + double b[] = {-2.13505380615258078,1.46060340345661088,-0.33198239813321595,0.01197270616590528}; //Coefficients for the formula to calculate inverse error + double c[] = {-1.994216456587148,-1.87267416351196,3.60874665878559364,1.82365845766309853}; //Coefficients for the formula to calculate inverse error + double d[] = {3.74146294065960872,1.81848952562894617}; //Coefficients for the formula to calculate inverse error if ((inp1 > 1) || (inp1 < -1)) { - return 0.0/0.0; + return 0.0/0.0; // returns Nan } if ((inp1 >= -0.7) && (inp1 <= 0.7)) { double sq = inp1 * inp1; - return (inp1 * (((a[3]*sq+a[2]) * sq+a[1]) * sq+a[0]) / ((((b[3]*sq+b[2]) * sq+b[1]) * sq+b[0]) * sq+1)); + return (inp1 * (((a[3]*sq+a[2]) * sq+a[1]) * sq+a[0]) / ((((b[3]*sq+b[2]) * sq+b[1]) * sq+b[0]) * sq+1)); //Inverse error formula } else if ((inp1 > 0.7) && (inp1 < 1)) { double z = sqrt(-log((1-inp1)/2)); - return ((((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1)); + return ((((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1)); //Inverse error formula } else if ((inp1 > -1) && (inp1 < 0.7)) { double z = sqrt(-log((1+inp1)/2)); - return (-(((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1)); + return (-(((c[3]*z+c[2]) * z+c[1]) * z+c[0]) / ((d[1]*z+d[0]) * z+1)); //Inverse error formula } } |