summaryrefslogtreecommitdiff
path: root/Build/source/utils/pmx/pmx-2.6.18/libf2c/z_sqrt.c
diff options
context:
space:
mode:
Diffstat (limited to 'Build/source/utils/pmx/pmx-2.6.18/libf2c/z_sqrt.c')
-rw-r--r--Build/source/utils/pmx/pmx-2.6.18/libf2c/z_sqrt.c35
1 files changed, 35 insertions, 0 deletions
diff --git a/Build/source/utils/pmx/pmx-2.6.18/libf2c/z_sqrt.c b/Build/source/utils/pmx/pmx-2.6.18/libf2c/z_sqrt.c
new file mode 100644
index 00000000000..35bd44c8e08
--- /dev/null
+++ b/Build/source/utils/pmx/pmx-2.6.18/libf2c/z_sqrt.c
@@ -0,0 +1,35 @@
+#include "f2c.h"
+
+#ifdef KR_headers
+double sqrt(), f__cabs();
+VOID z_sqrt(r, z) doublecomplex *r, *z;
+#else
+#undef abs
+#include "math.h"
+#ifdef __cplusplus
+extern "C" {
+#endif
+extern double f__cabs(double, double);
+void z_sqrt(doublecomplex *r, doublecomplex *z)
+#endif
+{
+ double mag, zi = z->i, zr = z->r;
+
+ if( (mag = f__cabs(zr, zi)) == 0.)
+ r->r = r->i = 0.;
+ else if(zr > 0)
+ {
+ r->r = sqrt(0.5 * (mag + zr) );
+ r->i = zi / r->r / 2;
+ }
+ else
+ {
+ r->i = sqrt(0.5 * (mag - zr) );
+ if(zi < 0)
+ r->i = - r->i;
+ r->r = zi / r->i / 2;
+ }
+ }
+#ifdef __cplusplus
+}
+#endif