1 files changed, 3 insertions, 0 deletions
diff --git a/gsl-1.9/specfunc/check.h b/gsl-1.9/specfunc/check.h
new file mode 100644
index 0000000..df6eee6
--- /dev/null
+++ b/gsl-1.9/specfunc/check.h
@@ -0,0 +1,3 @@
+/* check for underflow */
+
+#define CHECK_UNDERFLOW(r) if (fabs((r)->val) < GSL_DBL_MIN) GSL_ERROR("underflow", GSL_EUNDRFLW);