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2013-11-26 11:29:09 +0200 asked a question Computing the volume of a polytope that is not full-dimensional

Let us assume we are given a polytope in $\mathbb{R}^d$ which is $k$-dimensional. How can we compute its $k$-dimensional volume in Sage?

2013-11-05 03:36:07 +0200 commented answer Sum a list of vectors

Dear tmonteil, I made an error. Everything you suggested in your answers works for me now. Sorry for the confusion and thanks for your help.

2013-11-04 05:41:58 +0200 commented answer Sum a list of vectors

I don't use vector as a variable name. And the list is constructed as list = [vector(item.sage()) for item in list]. I have to use .sage() because the items in list are GAP elements.

2013-11-04 05:26:16 +0200 commented answer Sum a list of vectors

I tried that before but the error I get is "TypeError: 'sage.modules.vector_integer_dense.Vector_integer_dense' object is not callable"

2013-11-04 05:18:21 +0200 asked a question Sum a list of vectors

I'm given a list of rational vectors, i.e., something like [(1,2,3), (1/2, 4, 5), (-1, 0, 0)], and I need to sum all vectors of this list.

Even though I searched a bit, I cannot find the right sage command for this task. For example, sum() does not seem to work here. At least I couldn't figure out how to apply it to a list of such type.

Of course I could use a loop and an additional variable that saves the partial sums. But there has to be a more elegant way.