On 3/21/07, Neil Hodgson <nyamatongwe at gmail.com> wrote: > Travis Oliphant: > > > 3) information about discontiguous memory segments > > > > > > Number 3 is where I could use feedback --- especially from PIL users and > > developers. Strides are a common way to think about a possibly > > discontiguous chunk of memory (which appear in NumPy when you select a > > sub-region from a larger array). The strides vector tells you how many > > bytes to skip in each dimension to get to the next memory location for > > that dimension. > > I think one of the motivations for discontiguous segments was for > split buffers which are commonly used in text editors. A split buffer > has a gap in the middle where insertions and deletions can often occur > without moving much memory. When an insertion or deletion is required > elsewhere then the gap is first moved to that position. I have long > intended to implement a good split buffer extension for Python but the > best I have currently is an extension written using Boost.Python which > doesn't implement the buffer interface. Here is a description of split > buffers: > > http://www.cs.cmu.edu/~wjh/papers/byte.html But there's always a call to remove the gap (or move it to the end). -- --Guido van Rossum (home page: http://www.python.org/~guido/)
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