Hi, There seems to be a memory leak with the following example: from Numeric import * a=array([[1,2,3],[4,5,6],[7,8,9]], Float) for i in range(100000): for j in range(100000): c=a.tolist() If a=array([1,2,3,4]), then there is no leak. Any advice on this would be appreciated. Thanks. Regards, Jonah