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Module « numpy.matlib »

Fonction isfortran - module numpy.matlib

Signature de la fonction isfortran

def isfortran(a) 

Description

help(numpy.matlib.isfortran)

Check if the array is Fortran contiguous but *not* C contiguous.

This function is obsolete. If you only want to check if an array is Fortran
contiguous use ``a.flags.f_contiguous`` instead.

Parameters
----------
a : ndarray
    Input array.

Returns
-------
isfortran : bool
    Returns True if the array is Fortran contiguous but *not* C contiguous.


Examples
--------

np.array allows to specify whether the array is written in C-contiguous
order (last index varies the fastest), or FORTRAN-contiguous order in
memory (first index varies the fastest).

>>> import numpy as np
>>> a = np.array([[1, 2, 3], [4, 5, 6]], order='C')
>>> a
array([[1, 2, 3],
       [4, 5, 6]])
>>> np.isfortran(a)
False

>>> b = np.array([[1, 2, 3], [4, 5, 6]], order='F')
>>> b
array([[1, 2, 3],
       [4, 5, 6]])
>>> np.isfortran(b)
True


The transpose of a C-ordered array is a FORTRAN-ordered array.

>>> a = np.array([[1, 2, 3], [4, 5, 6]], order='C')
>>> a
array([[1, 2, 3],
       [4, 5, 6]])
>>> np.isfortran(a)
False
>>> b = a.T
>>> b
array([[1, 4],
       [2, 5],
       [3, 6]])
>>> np.isfortran(b)
True

C-ordered arrays evaluate as False even if they are also FORTRAN-ordered.

>>> np.isfortran(np.array([1, 2], order='F'))
False

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