fix numpy deprecations

Author: alexfikl

pytential/qbx/fmmlib.py

@@ -238,11 +238,11 @@ def reorder_potentials(self, potentials):
     def add_potgrad_onto_output(self, output, output_slice, pot, grad):
         for i_out, out in enumerate(self.tree_indep.outputs):
             if len(out) == 0:
-                output[i_out][output_slice] += pot
+                output[i_out][output_slice] += pot.squeeze()
             elif len(out) == 1:
                 axis, = out
                 if isinstance(grad, np.ndarray):
-                    output[i_out][output_slice] += grad[axis]
+                    output[i_out][output_slice] += grad[axis].squeeze()
                 else:
                     assert grad == 0
             else:

pytential/symbolic/execution.py

@@ -925,8 +925,7 @@ def _bmat(blocks, dtypes):
                              if not is_zero(blocks[ibrow, ibcol]))
              for ibcol in range(ncolumns)])
 
-    result = np.zeros((brs[-1], bcs[-1]),
-                      dtype=np.find_common_type(dtypes, []))
+    result = np.zeros((brs[-1], bcs[-1]), dtype=np.result_type(*dtypes))
     for ibcol in range(ncolumns):
         for ibrow in range(nrows):
             result[brs[ibrow]:brs[ibrow + 1], bcs[ibcol]:bcs[ibcol + 1]] = \