A Divendres 22 Octubre 2004 01:53, Gerald Richter va escriure:
shouldn't c_[...] result in something like array([ [ . ], [ . ] ]) while r_ results in array([ ... ]) ?
why does:
In [23]: a = r_[1:3:5j]
In [24]: b = c_[2:6:5j]
In SciPy tutorial (http://www.scipy.org/documentation/tutorial.pdf) Travis Oliphant says: """ The "r" stands for row concatenation because if the ob jects between commas are 2 dimensional arrays, they are stacked by rows (and thus must have commensurate columns). There is an equivalent command c that stacks 2d arrays by columns but works identically to r for 1d arrays. """ So, it seems that this is not a bug, but a feature. Although I would also find interesting that r_[1:3:5j] would generate: array([ 1. , 1.5, 2. , 2.5, 3. ]) and that c_[1:3:5j]) would do: array([[ 1. ], [ 1.5], [ 2. ], [ 2.5], [ 3. ]]) However, I don't know if this would be counter-intuitive in some cases. -- Francesc Alted