Hello. To learn how to program with muttable arrays in Haskell, I have done a very simple program to sum two arrays. I am submitting it to this group so that it can be reviewd and commented. I have not find examples on how to program with muttable arrays. I would like for instance to see comments on the way the iteration over the array indices was done: using a list of indices. I looked for a way of incrementting an index, starting from the lower bound towards the upper bound, but failed in finding it. Is there other ways of iterating over the muttable array other then using its list of indices? Regards, Romildo -- Prof. José Romildo Malaquias Departamento de Computação http://iceb.ufop.br/~romildo Universidade Federal de Ouro Preto romildo@iceb.ufop.br Brasil romildo@uber.com.br