Changeset eb2946f in sasmodels for sasmodels/models/lib/sas_3j1x_x.c

Timestamp:

May 18, 2017 5:10:29 PM (7 years ago)

Author:

Paul Kienzle <pkienzle@…>

Branches:

master, core_shell_microgels, costrafo411, magnetic_model, ticket-1257-vesicle-product, ticket_1156, ticket_1265_superball, ticket_822_more_unit_tests

Children:

1b85b55

Parents:

452b168

Message:

improve precision of sasmodels special functions

File:

• sasmodels/models/lib/sas_3j1x_x.c (modified) (1 diff)

sasmodels/models/lib/sas_3j1x_x.c

@@ -46 +46 @@
 double sas_3j1x_x(double q)
 {
-    if (q < SPH_J1C_CUTOFF) {
+    // 2017-05-18 PAK - support negative q
+    if (fabs(q) < SPH_J1C_CUTOFF) {
         const double q2 = q*q;
         return (1.0 + q2*(-3./30. + q2*(3./840. + q2*(-3./45360.))));// + q2*(3./3991680.)))));