- powers with negative exponents are printed as fractions in the LaTeX output

[ginac.git] / ginac / power.cpp

diff --git a/ginac/power.cpp b/ginac/power.cpp
index 85e5bd6c9a92e76c470dc83c527a4d6eaa85a0d0..32473bd4c964677f599364300f9c335e776130a9 100644 (file)
--- a/ginac/power.cpp
+++ b/ginac/power.cpp
@@ -172,11 +172,23 @@ void power::print(const print_context & c, unsigned level) const
 
                bool is_tex = is_a<print_latex>(c);
 
-               if (exponent.is_equal(_ex1_2)) {
+               if (is_tex && is_a<numeric>(exponent) && ex_to<numeric>(exponent).is_negative()) {
+
+                       // Powers with negative numeric exponents are printed as fractions in TeX
+                       c.s << "\\frac{1}{";
+                       power(basis, -exponent).eval().print(c);
+                       c.s << "}";
+
+               } else if (exponent.is_equal(_ex1_2)) {
+
+                       // Square roots are printed in a special way
                        c.s << (is_tex ? "\\sqrt{" : "sqrt(");
                        basis.print(c);
                        c.s << (is_tex ? '}' : ')');
+
                } else {
+
+                       // Ordinary output of powers using '^' or '**'
                        if (precedence() <= level)
                                c.s << (is_tex ? "{(" : "(");
                        basis.print(c, precedence());