Fixed a bug in atan2. It gave a division by zero error for calls like

atan2(-Pi,0), because arguments like -Pi were not recognized (via
info_flags) as negative but as real nevertheless.
(cherry picked from commit 9e13d46552bb7852399867b9eb355732b9ded59e)

diff --git a/ginac/inifcns_trans.cpp b/ginac/inifcns_trans.cpp
index 39931dc..3f161d2 100644 (file)
--- a/ginac/inifcns_trans.cpp
+++ b/ginac/inifcns_trans.cpp
@@ -842,7 +842,7 @@ static ex atan2_eval(const ex & y, const ex & x)
                        return _ex1_2*Pi;
 
                // atan(y, 0), y real and negative -> -Pi/2
-               if (y.info(info_flags::negative))
+               if (y.info(info_flags::real) && !y.is_zero())
                        return _ex_1_2*Pi;
        }