replace get set in antitranspose with copy

Author: Biffo89

src/sage/matrix/matrix_dense.pyx

@@ -183,7 +183,7 @@ cdef class Matrix_dense(matrix.Matrix):
             rj -= 1
             for i from 0 <= i < nr:
                 ri -= 1
-                atrans.set_unsafe(j, i, self.get_unsafe(ri, rj))
+                atrans.copy_from_unsafe(j, i, self, ri, rj)
 
         if self._subdivisions is not None:
             row_divs, col_divs = self.subdivisions()

src/sage/matrix/matrix_sparse.pyx

@@ -464,7 +464,7 @@ cdef class Matrix_sparse(matrix.Matrix):
         for k from 0 <= k < len(nz):
             i = get_ij(nz, k, 0)
             j = get_ij(nz, k, 1)
-            A.set_unsafe(self._ncols-j-1, self._nrows-i-1,self.get_unsafe(i,j))
+            A.copy_from_unsafe(self._ncols-j-1, self._nrows-i-1, self, i, j)
         if self._subdivisions is not None:
             row_divs, col_divs = self.subdivisions()
             A.subdivide(list(reversed([self._ncols - t for t in col_divs])),