On Wed, Jul 8, 2009 at 4:10 PM, Citi, Luca <lc...@essex.ac.uk> wrote:
> @Charles R Harris > > >> For example 'sqrt(a**2 + b**2)' can be performed... > > I think this particular function is already available as a ufunc. > > I am not sure it is implemented as ufunc. > But in any case it was just an example. > > Another example is > sin(2*pi*w+phi) > that is currently implemented allocating a temporary vector for > (2*pi*w), another temporary vector for (2*pi*w+phi) and another > for sin(2*pi*w+phi). > With my patch only the first temporary vector is allocated, > then it is reused twice and finally returned. > One allocation instead of three. > > All this happens under the hood and is completely transparent to the user. > On thing to keep in mind is that the inputs might be different views of the same array so the elements might accessed in an unexpected order. Chuck
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