Thanks for the tip-off! That does make sense. Is this documented anywhere, as if so I didn't find it? Although no doubt I would have found out eventually by experience.

Cheers,
David

On 15 May 2012 05:29, "Luc Bourhis" <luc_j_bourhis@mac.com> wrote:
Hi David,

Tuple as a common type for all sequence-type objects makes sense in Python

Only for those sequences whose size is fixed at compile-time, i.e. af::tiny, af::small and any type derived from them, which at the moment is limited to scitbx::vec3 and scitbx::vec2 from the top of my head. If you return an array with a dynamic size, i.e. af::shared or af::versa, then it will be converted to scitbx.array_family.shared and scitbx.array_family.flex respectively.

HtH,

Luc



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