change should not be complex dtype, which would happen if u=complex. Fixed...

change should not be complex dtype, which would happen if u=complex. Fixed this by not specifying dtype

proxtoolbox/Algorithms/SimpleAlgortihm.py

@@ -116,7 +116,7 @@ class SimpleAlgorithm:
             p = u.shape[2]
             q = u.shape[3]
 
-        change = zeros(maxiter + 1, dtype=u.dtype)
+        change = zeros(maxiter + 1)
         change[0] = 999
 
         ######################################