green351 wrote: > Hi. I have the following problem: consider the following list of > compositions and its cartesian product with itself. > > C83=Compositions(8, length=3); > cp=CartesianProduct(C83,C83) > > I want to remove certain elements from this set/list and then to count > the elements left. For example I want to remove the element [[1,1,6], > [1,2,5]] and in general for [[a,b,c],[d,e,f]], I want to remove it if > a=d=1 OR b=e=1 Or c=f=1. There are other things I want to remove but > I think if I figure out the correct syntax for the above I could > probably figure the rest out. How would I do this? >
You could also use list comprehensions to construct a list of elements that you want: [e for e in cp if not ((e[0][0]==1 and e[1][0]==1) or (e[0][1]==1 and e[1][1]==1) or (e[0][2]==1 and e[1][2]==1))] Jason --~--~---------~--~----~------------~-------~--~----~ 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-support URLs: http://www.sagemath.org -~----------~----~----~----~------~----~------~--~---
