fixed a problem in the LaTeX-output of negative fractions

diff --git a/ginac/numeric.cpp b/ginac/numeric.cpp
index a9f1c67b4178a44665bd41516d475c09468537b3..a3872b96650b9843505126cce338757ade54169a 100644 (file)
--- a/ginac/numeric.cpp
+++ b/ginac/numeric.cpp
@@ -322,8 +322,10 @@ static void print_real_number(const print_context & c, const cln::cl_R &x)
                    !is_a<print_latex>(c)) {
                        cln::print_real(c.s, ourflags, x);
                } else {  // rational output in LaTeX context
+                       if (x < 0)
+                               c.s << "-";
                        c.s << "\\frac{";
-                       cln::print_real(c.s, ourflags, cln::numerator(cln::the<cln::cl_RA>(x)));
+                       cln::print_real(c.s, ourflags, cln::abs(cln::numerator(cln::the<cln::cl_RA>(x))));
                        c.s << "}{";
                        cln::print_real(c.s, ourflags, cln::denominator(cln::the<cln::cl_RA>(x)));
                        c.s << '}';