- Fix thinko in csgn_eval().

[ginac.git] / ginac / inifcns.cpp

diff --git a/ginac/inifcns.cpp b/ginac/inifcns.cpp
index 0daa97989abf8260202a0db99cfb572f576379ec..3bf0b2f7e9b93554c9344d357e848be1c9ba4aa3 100644 (file)
--- a/ginac/inifcns.cpp
+++ b/ginac/inifcns.cpp
@@ -82,7 +82,8 @@ static ex csgn_eval(const ex & arg)
        if (is_ex_exactly_of_type(arg, numeric))
                return csgn(ex_to_numeric(arg));
        
-       else if (is_ex_exactly_of_type(arg, mul)) {
+       else if (is_ex_of_type(arg, mul) &&
+                is_ex_of_type(arg.op(arg.nops()-1),numeric)) {
                numeric oc = ex_to_numeric(arg.op(arg.nops()-1));
                if (oc.is_real()) {
                        if (oc > 0)
@@ -101,7 +102,7 @@ static ex csgn_eval(const ex & arg)
                                return -csgn(I*arg/oc).hold();
                }
        }
-   
+       
        return csgn(arg).hold();
 }