Thank you !!! Nathann
On Jul 8, 3:46 pm, William Stein <[email protected]> wrote: > On Wed, Jul 8, 2009 at 2:30 AM, Nathann Cohen<[email protected]> wrote: > > > Hello !!! > > > Would any of you know how to convert a Python list to a C array of > > double or int ? > > > I saw on Google plenty of people had the same problem but was not able > > to find a clear answer... Thank you !! > > Here is a complete example of how to do this in the Sage notebook: > > {{{ > %cython > def f(v): > cdef int* w = <int*> sage_malloc(len(v)*sizeof(int)) > cdef unsigned long i, n > n = len(v) > for i in range(n): > w[i] = int(v[i]) > # Now w is a C array of ints. Do with it what you will, e.g., sum > its entries > cdef int s=0 > for i in range(n): > s += w[i] > # Do not forget to de-allocate it: > sage_free(w) > return s > /// > > }}} > > {{{ > f([1..100]) > /// > > 5050 > > }}} --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/sage-devel URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
