Christopher Barker wrote:
I want to take two (2,) arrays and put them together into one (2,2) array. I thought one of these would work:
N.concatenate(((1,2),(3,4)),0) array([1, 2, 3, 4]) N.concatenate(((1,2),(3,4)),1) array([1, 2, 3, 4])
Is this the best I can do?
N.concatenate(((1,2),(3,4))).reshape(2,2) array([[1, 2], [3, 4]])
Is it because the arrays I'm putting together are rank-1?
Yes. You need to add a dimension somehow. There are (at least) two ways to do this. If you are using real arrays, use newaxis: >>> a array([0, 1, 2]) >>> b array([3, 4, 5]) >>> concatenate([a[newaxis], b[newaxis]], 0) array([[0, 1, 2], [3, 4, 5]]) Alternatively, if you don't know that 'a' and 'b' are arrays or you just hate newaxis, wrap the arrays in [] to give them an extra dimension. This tends to look nicer, but I suspect has poorer performance than above (haven't timed it though): >>> concatenate([[a], [b]], 0) array([[0, 1, 2], [3, 4, 5]]) -tim
N.__version__ '0.9.6'
-Chris