Reordering skew_schur for speed.

sagemath · Sep 15, 2015 · 14e6047 · 14e6047
1 parent fee5688
commit 14e6047
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/src/sage/combinat/sf/sfa.py b/src/sage/combinat/sf/sfa.py
@@ -865,11 +865,11 @@ def skew_schur(self, x):
                 ...
                 ValueError: not a valid skew partition
             """
-            s = self.realization_of().schur()
             from sage.combinat.skew_partition import SkewPartitions
-            import sage.libs.lrcalc.lrcalc as lrcalc
             if x not in SkewPartitions():
                 raise ValueError("not a valid skew partition")
+            import sage.libs.lrcalc.lrcalc as lrcalc
+            s = self.realization_of().schur()
             skewschur = lrcalc.skew(x[0], x[1])
             return self(s._from_dict(skewschur))