f2py中二维数组的示例:
C FILE: ARRAY.FSUBROUTINE FOO(A,N,M)
C
C INCREMENT THE FIRST ROW AND DECREMENT THE FIRST COLUMN OF A
CINTEGER N,M,I,JREAL*8 A(N,M)
Cf2py intent(in,out,copy) a
Cf2py integer intent(hide),depend(a) :: n=shape(a,0), m=shape(a,1)DO J=1,MA(1,J) = A(1,J) + 1D0ENDDODO I=1,NA(I,1) = A(I,1) - 1D0ENDDOEND
C END OF FILE ARRAY.F
在DOS窗口输入
f2py -c -m arr array.f
下面演示在python中如何使用:
>>> import arr
>>> from Numeric import array
>>> print arr.foo.__doc__
foo - Function signature:a = foo(a,[overwrite_a])
Required arguments:a : input rank-2 array('d') with bounds (n,m)
Optional arguments:overwrite_a := 0 input int
Return objects:a : rank-2 array('d') with bounds (n,m)>>> a=arr.foo([[1,2,3],
... [4,5,6]])
copied an array using PyArray_CopyFromObject: size=6, elsize=8
>>> print a
[[ 1. 3. 4.][ 3. 5. 6.]]
>>> a.iscontiguous(), arr.has_column_major_storage(a)
(0, 1)
>>> b=arr.foo(a) # even if a is proper-contiguous
... # and has proper type, a copy is made
... # forced by intent(copy) attribute
... # to preserve its original contents
...
copied an array using copy_ND_array: size=6, elsize=8
>>> print a
[[ 1. 3. 4.][ 3. 5. 6.]]
>>> print b
[[ 1. 4. 5.][ 2. 5. 6.]]
>>> b=arr.foo(a,overwrite_a=1) # a is passed directly to Fortran
... # routine and its contents is discarded
...
>>> print a
[[ 1. 4. 5.][ 2. 5. 6.]]
>>> print b
[[ 1. 4. 5.][ 2. 5. 6.]]
>>> a is b # a and b are acctually the same objects
1
>>> print arr.foo([1,2,3]) # different rank arrays are allowed
copied an array using PyArray_CopyFromObject: size=3, elsize=8
[ 1. 1. 2.]
>>> print arr.foo([[[1],[2],[3]]])
copied an array using PyArray_CopyFromObject: size=3, elsize=8
[ [[ 1.][ 3.][ 4.]]]
>>>
>>> # Creating arrays with column major data storage order:
...
>>> s = arr.as_column_major_storage(array([[1,2,3],[4,5,6]]))
copied an array using copy_ND_array: size=6, elsize=4
>>> arr.has_column_major_storage(s)
1
>>> print s
[[1 2 3][4 5 6]]
>>> s2 = arr.as_column_major_storage(s)
>>> s2 is s # an array with column major storage order # is returned immediately
1
详细介绍可见下面的网站
http://cens.ioc.ee/projects/f2py2e/usersguide/index.html#string-arguments