Functions
template<class E >
auto	xt::transpose (E &&e) noexcept
	Returns a transpose view by reversing the dimensions of xexpression e.

template<class E , class S , class Tag = check_policy::none>
auto	xt::transpose (E &&e, S &&permutation, Tag check_policy)
	Returns a transpose view by permuting the xexpression e with `permutation`.

template<class E >
auto	xt::swapaxes (E &&e, std::ptrdiff_t axis1, std::ptrdiff_t axis2)
	Return a new expression with two axes interchanged.

template<class E >
auto	xt::moveaxis (E &&e, std::ptrdiff_t src, std::ptrdiff_t dest)
	Return a new expression with an axis move to a new position.

template<layout_type L = ::xt::layout_type::row_major, class E >
auto	xt::ravel (E &&e)
	Return a flatten view of the given expression.

template<layout_type L = ::xt::layout_type::row_major, class E >
auto	xt::flatten (E &&e)
	Return a flatten view of the given expression.

template<class E >
auto	xt::trim_zeros (E &&e, const std::string &direction)
	Trim zeros at beginning, end or both of 1D sequence.

template<class E >
auto	xt::squeeze (E &&e)
	Returns a squeeze view of the given expression.

template<class E , class S , class Tag = check_policy::none, std::enable_if_t<!xtl::is_integral< S >::value, int > = 0>
auto	xt::squeeze (E &&e, S &&axis, Tag check_policy)
	Remove single-dimensional entries from the shape of an xexpression.

template<class E >
auto	xt::expand_dims (E &&e, std::size_t axis)
	Expand the shape of an xexpression.

template<std::size_t N, class E >
auto	xt::atleast_Nd (E &&e)
	Expand dimensions of xexpression to at least `N`

template<class E >
auto	xt::atleast_1d (E &&e)
	Expand to at least 1D.

template<class E >
auto	xt::atleast_2d (E &&e)
	Expand to at least 2D.

template<class E >
auto	xt::atleast_3d (E &&e)
	Expand to at least 3D.

template<class E >
auto	xt::split (E &e, std::size_t n, std::size_t axis)
	Split xexpression along axis into subexpressions.

template<class E >
auto	xt::hsplit (E &e, std::size_t n)
	Split an xexpression into subexpressions horizontally (column-wise)

template<class E >
auto	xt::vsplit (E &e, std::size_t n)
	Split an xexpression into subexpressions vertically (row-wise)

template<class E >
auto	xt::flip (E &&e)
	Reverse the order of elements in an xexpression along every axis.

template<class E >
auto	xt::flip (E &&e, std::size_t axis)
	Reverse the order of elements in an xexpression along the given axis.

template<std::ptrdiff_t N = 1, class E >
auto	xt::rot90 (E &&e, const std::array< std::ptrdiff_t, 2 > &axes)
	Rotate an array by 90 degrees in the plane specified by axes.

template<class E >
auto	xt::roll (E &&e, std::ptrdiff_t shift)
	Roll an expression.

template<class E >
auto	xt::roll (E &&e, std::ptrdiff_t shift, std::ptrdiff_t axis)
	Roll an expression along a given axis.

template<class E >
auto	xt::repeat (E &&e, std::size_t repeats, std::size_t axis)
	Repeat elements of an expression along a given axis.

template<class E >
auto	xt::repeat (E &&e, const std::vector< std::size_t > &repeats, std::size_t axis)
	Repeat elements of an expression along a given axis.

template<class E >
auto	xt::repeat (E &&e, std::vector< std::size_t > &&repeats, std::size_t axis)
	Repeat elements of an expression along a given axis.

Detailed Description

Function Documentation

◆ atleast_1d()

template<class E >

auto xt::atleast_1d ( E && e )

inline

Expand to at least 1D.

See also: atleast_Nd

Definition at line 685 of file xmanipulation.hpp.

◆ atleast_2d()

template<class E >

auto xt::atleast_2d ( E && e )

inline

Expand to at least 2D.

See also: atleast_Nd

Definition at line 697 of file xmanipulation.hpp.

◆ atleast_3d()

template<class E >

auto xt::atleast_3d ( E && e )

inline

Expand to at least 3D.

See also: atleast_Nd

Definition at line 709 of file xmanipulation.hpp.

◆ atleast_Nd()

template<std::size_t N, class E >

auto xt::atleast_Nd ( E && e )

inline

Expand dimensions of xexpression to at least N

This adds newaxis() slices to a strided_view until the dimension of the view reaches at least N. Note: dimensions are added equally at the beginning and the end. For example, a 1-D array of shape (N,) becomes a view of shape (1, N, 1).

Parameters

e	input xexpression

Template Parameters

N	the number of requested dimensions

Returns: strided_view with expanded dimensions

Definition at line 658 of file xmanipulation.hpp.

◆ expand_dims()

template<class E >

auto xt::expand_dims	(	E &&	e,
		std::size_t	axis )

inline

Expand the shape of an xexpression.

Insert a new axis that will appear at the axis position in the expanded array shape. This will return a strided_view with a xt::newaxis() at the indicated axis.

Parameters

e	input xexpression
axis	axis to expand

Returns: returns a strided_view with expanded dimension

Definition at line 633 of file xmanipulation.hpp.

◆ flatten()

template<layout_type L = ::xt::layout_type::row_major, class E >

auto xt::flatten ( E && e )

inline

Return a flatten view of the given expression.

No copy is made. This method is equivalent to ravel and is provided for API sameness with NumPy.

Parameters

e	the input expression

Template Parameters

L	the layout used to read the elements of e. If no parameter is specified, XTENSOR_DEFAULT_TRAVERSAL is used.
E	the type of the expression

See also: ravel

Definition at line 442 of file xmanipulation.hpp.

◆ flip() [1/2]

template<class E >

auto xt::flip ( E && e )

inline

Reverse the order of elements in an xexpression along every axis.

Parameters

e	the input xexpression

Returns: returns a view with the result of the flip.

Definition at line 800 of file xmanipulation.hpp.

◆ flip() [2/2]

template<class E >

auto xt::flip	(	E &&	e,
		std::size_t	axis )

inline

Reverse the order of elements in an xexpression along the given axis.

Note: A NumPy/Matlab style flipud(arr) is equivalent to xt::flip(arr, 0), fliplr(arr) to xt::flip(arr, 1).

Parameters

e	the input xexpression
axis	the axis along which elements should be reversed

Returns: returns a view with the result of the flip

Definition at line 823 of file xmanipulation.hpp.

◆ hsplit()

template<class E >

auto xt::hsplit	(	E &	e,
		std::size_t	n )

inline

Split an xexpression into subexpressions horizontally (column-wise)

This method is equivalent to split(e, n, 1).

Parameters

e	input xexpression
n	number of elements to return

Definition at line 768 of file xmanipulation.hpp.

◆ moveaxis()

template<class E >

auto xt::moveaxis	(	E &&	e,
		std::ptrdiff_t	src,
		std::ptrdiff_t	dest )

inline

Return a new expression with an axis move to a new position.

Parameters

e	The input expression
src	Original position of the axis to move
dest	Destination position for the original axis.

Definition at line 368 of file xmanipulation.hpp.

◆ ravel()

template<layout_type L = ::xt::layout_type::row_major, class E >

auto xt::ravel ( E && e )

inline

Return a flatten view of the given expression.

No copy is made.

Parameters

e	the input expression

Template Parameters

L	the layout used to read the elements of e. If no parameter is specified, XTENSOR_DEFAULT_TRAVERSAL is used.
E	the type of the expression

Definition at line 417 of file xmanipulation.hpp.

◆ repeat() [1/3]

template<class E >

auto xt::repeat	(	E &&	e,
		const std::vector< std::size_t > &	repeats,
		std::size_t	axis )

inline

Repeat elements of an expression along a given axis.

Parameters

e	the input xexpression
repeats	The number of repetition of each elements. The size of `repeats` must match the shape of the given `axis`.
axis	the axis along which to repeat the value

Returns: an expression which as the same shape as e, except along the given axis

Definition at line 1123 of file xmanipulation.hpp.

◆ repeat() [2/3]

template<class E >

auto xt::repeat	(	E &&	e,
		std::size_t	repeats,
		std::size_t	axis )

inline

Repeat elements of an expression along a given axis.

Parameters

e	the input xexpression
repeats	The number of repetition of each elements. `repeats` is broadcasted to fit the shape of the given `axis`.
axis	the axis along which to repeat the value

Returns: an expression which as the same shape as e, except along the given axis

Definition at line 1103 of file xmanipulation.hpp.

◆ repeat() [3/3]

template<class E >

auto xt::repeat	(	E &&	e,
		std::vector< std::size_t > &&	repeats,
		std::size_t	axis )

inline

Repeat elements of an expression along a given axis.

Parameters

e	the input xexpression
repeats	The number of repetition of each elements. The size of `repeats` must match the shape of the given `axis`.
axis	the axis along which to repeat the value

Returns: an expression which as the same shape as e, except along the given axis

Definition at line 1139 of file xmanipulation.hpp.

◆ roll() [1/2]

template<class E >

auto xt::roll	(	E &&	e,
		std::ptrdiff_t	shift )

inline

Roll an expression.

The expression is flatten before shifting, after which the original shape is restore. Elements that roll beyond the last position are re-introduced at the first. This function does not change the input expression.

Parameters

e	the input xexpression
shift	the number of places by which elements are shifted

Returns: a roll of the input expression

Definition at line 952 of file xmanipulation.hpp.

◆ roll() [2/2]

template<class E >

auto xt::roll	(	E &&	e,
		std::ptrdiff_t	shift,
		std::ptrdiff_t	axis )

inline

Roll an expression along a given axis.

Elements that roll beyond the last position are re-introduced at the first. This function does not change the input expression.

Parameters

e	the input xexpression
shift	the number of places by which elements are shifted
axis	the axis along which elements are shifted.

Returns: a roll of the input expression

Definition at line 1049 of file xmanipulation.hpp.

◆ rot90()

template<std::ptrdiff_t N = 1, class E >

auto xt::rot90	(	E &&	e,
		const std::array< std::ptrdiff_t, 2 > &	axes )

inline

Rotate an array by 90 degrees in the plane specified by axes.

Rotation direction is from the first towards the second axis.

Parameters

e	the input xexpression
axes	the array is rotated in the plane defined by the axes. Axes must be different.

Template Parameters

N	number of times the array is rotated by 90 degrees. Default is 1.

Returns: returns a view with the result of the rotation

Definition at line 919 of file xmanipulation.hpp.

◆ split()

template<class E >

auto xt::split	(	E &	e,
		std::size_t	n,
		std::size_t	axis )

inline

Split xexpression along axis into subexpressions.

This splits an xexpression along the axis in n equal parts and returns a vector of strided_view. Calling split with axis > dimension of e or a n that does not result in an equal division of the xexpression will throw a runtime_error.

Parameters

e	input xexpression
n	number of elements to return
axis	axis along which to split the expression

Definition at line 732 of file xmanipulation.hpp.

◆ squeeze() [1/2]

template<class E >

auto xt::squeeze ( E && e )

inline

Returns a squeeze view of the given expression.

No copy is made. Squeezing an expression removes dimensions of extent 1.

Parameters

e	the input expression

Template Parameters

E	the type of the expression

Definition at line 513 of file xmanipulation.hpp.

◆ squeeze() [2/2]

template<class E , class S , class Tag = check_policy::none, std::enable_if_t<!xtl::is_integral< S >::value, int > = 0>

auto xt::squeeze	(	E &&	e,
		S &&	axis,
		Tag	check_policy )

inline

Remove single-dimensional entries from the shape of an xexpression.

Parameters

e	input xexpression
axis	integer or container of integers, select a subset of single-dimensional entries of the shape.
check_policy	select check_policy. With check_policy::full(), selecting an axis which is greater than one will throw a runtime_error.

Definition at line 592 of file xmanipulation.hpp.

◆ swapaxes()

template<class E >

auto xt::swapaxes	(	E &&	e,
		std::ptrdiff_t	axis1,
		std::ptrdiff_t	axis2 )

inline

Return a new expression with two axes interchanged.

The two axis parameter axis and axis2 are interchangable.

Parameters

e	The input expression
axis1	First axis to swap
axis2	Second axis to swap

Definition at line 314 of file xmanipulation.hpp.

◆ transpose() [1/2]

template<class E >

auto xt::transpose ( E && e )

inlinenoexcept

Returns a transpose view by reversing the dimensions of xexpression e.

Parameters

e	the input expression

Definition at line 237 of file xmanipulation.hpp.

◆ transpose() [2/2]

template<class E , class S , class Tag = check_policy::none>

auto xt::transpose	(	E &&	e,
		S &&	permutation,
		Tag	check_policy )

inline

Returns a transpose view by permuting the xexpression e with permutation.

Parameters

e	the input expression
permutation	the sequence containing permutation
check_policy	the check level (check_policy::full() or check_policy::none())

Template Parameters

Tag	selects the level of error checking on permutation vector defaults to check_policy::none.

Definition at line 269 of file xmanipulation.hpp.

◆ trim_zeros()

template<class E >

auto xt::trim_zeros	(	E &&	e,
		const std::string &	direction )

inline

Trim zeros at beginning, end or both of 1D sequence.

Parameters

e	input xexpression
direction	string of either 'f' for trim from beginning, 'b' for trim from end or 'fb' (default) for both.

Returns: returns a view without zeros at the beginning and end

Definition at line 475 of file xmanipulation.hpp.

◆ vsplit()

template<class E >

auto xt::vsplit	(	E &	e,
		std::size_t	n )

inline

Split an xexpression into subexpressions vertically (row-wise)

This method is equivalent to split(e, n, 0).

Parameters

e	input xexpression
n	number of elements to return

Definition at line 783 of file xmanipulation.hpp.

Functions

Detailed Description

Function Documentation

◆ atleast_1d()

◆ atleast_2d()

◆ atleast_3d()

◆ atleast_Nd()

◆ expand_dims()

◆ flatten()

◆ flip() [1/2]

◆ flip() [2/2]

◆ hsplit()

◆ moveaxis()

◆ ravel()

◆ repeat() [1/3]

◆ repeat() [2/3]

◆ repeat() [3/3]

◆ roll() [1/2]

◆ roll() [2/2]

◆ rot90()

◆ split()

◆ squeeze() [1/2]

◆ squeeze() [2/2]

◆ swapaxes()

◆ transpose() [1/2]

◆ transpose() [2/2]

◆ trim_zeros()

◆ vsplit()