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Xavier Thompson
cython
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21118651
Commit
21118651
authored
Sep 24, 2011
by
Mark Florisson
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Update memoryview documentation
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docs/src/userguide/memoryviews.rst
View file @
21118651
...
@@ -79,34 +79,26 @@ This gives a new, transposed, view on the data.
...
@@ -79,34 +79,26 @@ This gives a new, transposed, view on the data.
Specifying data layout
Specifying data layout
======================
======================
Data layout can be specified using the previously seen `
::1
` slice syntax, or by using any
Data layout can be specified using the previously seen `
`::1`
` slice syntax, or by using any
of the constants in `
cython.view
`.
of the constants in `
`cython.view`
`.
The concepts are as follows: there is data access and data packing. Data access means either
The concepts are as follows: there is data access and data packing. Data access means either
direct (no pointer) or indirect (pointer).
Generic means you don't know, and want the compiler
direct (no pointer) or indirect (pointer).
Data packing means your data may be strided (e.g. after slicing it,
a[::2]
) or contiguous
Data packing means your data may be strided (e.g. after slicing it,
``a[::2]``
) or contiguous
(consecutive elements are adjacent in memory). If no specifier is given in any dimension,
(consecutive elements are adjacent in memory). If no specifier is given in any dimension,
the data access is assumed to be direct, and the data packing assumed to be strided.
the
n the
data access is assumed to be direct, and the data packing assumed to be strided.
If you don't know whether a dimension will be direct or indirect (because you
got
an object
If you don't know whether a dimension will be direct or indirect (because you
're getting
an object
with a buffer interface from some library perhaps), then you can specify the `generic` flag,
with a buffer interface from some library perhaps), then you can specify the `generic` flag,
in which case it will be determined at runtime.
in which case it will be determined at runtime.
The flags are as follows:
The flags are as follows:
cdef generic = Enum("<strided and direct or indirect>")
cdef strided = Enum("<strided and direct>") # default
cdef indirect = Enum("<strided and indirect>")
# Disable generic_contiguous, as it is a troublemaker
#cdef generic_contiguous = Enum("<contiguous and direct or indirect>")
cdef contiguous = Enum("<contiguous and direct>")
cdef indirect_contiguous = Enum("<contiguous and indirect>")
* generic - strided and direct or indirect
* generic - strided and direct or indirect
* strided - strided and direct (this is the default)
* strided - strided and direct (this is the default)
* indirect - strided and indirect
* indirect - strided and indirect
* contiguous - contiguous and direct
* contiguous - contiguous and direct
* indirect_contiguous - the list of pointers is contiguous
* indirect_contiguous - the list of pointers is contiguous
They can be used as follow
s::
and they can be used like thi
s::
from cython cimport view
from cython cimport view
...
...
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