Matthieu Brucher wrote:

I have an object that exposes an array interface. I want to modify the data it contains, but using numpy.array(myObject) seems to copy the data and thus my object is not modified. Am I mistaken or did I make a mistake in my array interface ?

I think numpy.array(object) always makes a copy. You want numpy.asarray(object) which will make a view if object exposes the array interface and matches the type and sizes requested. -Chris -- Christopher Barker, Ph.D. Oceanographer Emergency Response Division NOAA/NOS/OR&R (206) 526-6959 voice 7600 Sand Point Way NE (206) 526-6329 fax Seattle, WA 98115 (206) 526-6317 main reception Chris.Barker@noaa.gov

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I think numpy.array(object) always makes a copy.

You want numpy.asarray(object) which will make a view if object exposes the array interface and matches the type and sizes requested.

FYI, numpy.asarray is a shortcut for numpy.array(copy=False), numpy.asanyarray for numpy.array(copy=False, subok=True)... In other terms, you can stick to array, as long as you provide the proper keywords.