"William Stein" <[EMAIL PROTECTED]> writes: > Naive question: what exactly is broadcasting, and how might it be > useful in the context of SAGE?
Joshua Kantor explained in more detail, but simply being able to do a[:,1:3] += 2 to add 2 to a portion of an array is already an illustration. Note that this also requires the view semantics. Here's another example that came up the very first time I tried to do something serious with sage. I was doing some row manipulations to a matrix a, and wanted to do something like a[i] += 5*a[j] While sage does currently interpret a[i] as a row vector, since it isn't a view, this doesn't do the right thing. For each example, it would be easy to cook up a function like add_scalar_multiple_of_one_row_to_another, but the combination of broadcasting and view semantics gives a wide class of array operations all in one go. As a bonus, you get speed (because loops get pushed down to carefully written loops) and memory efficiency. I realize though that this could interact badly with other aspects of the way sage works. Dan --~--~---------~--~----~------------~-------~--~----~ To post to this group, send email to sage-support@googlegroups.com 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://sage.math.washington.edu/sage/ and http://sage.scipy.org/sage/ -~----------~----~----~----~------~----~------~--~---
