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 Neil
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