xi in and he wrote the book on which these notes are based throughout these lecture notes have extensively copied ideaspresentation styleand code examples from his original booksimply because find them excellent for introducing programming in scientific context if it were not for hans petter would clearly never have written these notes would probably not be writing this either if he had notsadlypassed away in there would be no need tobecause he would surely have written far better and more extensive book himself may joakim sundnes