casacore::MatrixIterator< T, Alloc > Class Template Reference

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#include <MatrixIter.h>

Public Member Functions
	MatrixIterator (Array< T, Alloc > &a)
	Iterate by matrices through array "a". More...
	MatrixIterator (Array< T, Alloc > &a, size_t cursorAxis1, size_t cursorAxis2)
	Iterate by matrices through array "a". More...
Matrix< T, Alloc > &	matrix ()
	Return the matrix at the current position. More...
Public Member Functions inherited from casacore::ArrayIterator< T, std::allocator< T > >
	ArrayIterator (const Array< T, std::allocator< T > > &arr, size_t byDim=1)
	Step through array "arr" over the first byDim axes (using a cursor of dimensionality "byDim"). More...
	ArrayIterator (const Array< T, std::allocator< T > > &arr, const IPosition &axes, bool axesAreCursor=true)
	Step through an array using the given axes. More...
virtual void	next () override
	Move the cursor to the next position. More...
virtual void	set (const IPosition &cursorPos) override
	Set the cursor to the given position. More...
virtual void	reset () override
	Reset the cursor to the beginning. More...
Array< T, std::allocator< T > > &	array ()
	Return the cursor. More...
virtual ArrayBase &	getArray () override
	Get the array in the cursor. More...
Public Member Functions inherited from casacore::ArrayPositionIterator
	ArrayPositionIterator (const IPosition &shape, const IPosition &origin, size_t byDim)
	Define the shape and origin of the volume the cursor will step through. More...
	ArrayPositionIterator (const IPosition &shape, size_t byDim)
	ArrayPositionIterator (const IPosition &shape, const IPosition &axes, bool axesAreCursor=true)
	Step through an array using the given axes. More...
virtual	~ArrayPositionIterator ()
void	origin ()
bool	atStart () const
	Returns true of the cursor is at the origin. More...
bool	pastEnd () const
	Returns true if the cursor has moved past the end of its volume. More...
const IPosition &	pos () const
	Return the position of the cursor. More...
IPosition	endPos () const
	Return the end position of the cursor. More...
size_t	ndim () const
	What is the dimensionality of the volume we are iterating through? More...
const IPosition &	iterAxes () const
	Return the iteration axes. More...
const IPosition &	cursorAxes () const
	Return the cursor axes. More...

Private Member Functions
	MatrixIterator (const MatrixIterator< T, Alloc > &)=delete
	Not implemented. More...
MatrixIterator< T, Alloc > &	operator= (const MatrixIterator< T, Alloc > &)=delete
	Not implemented. More...

Additional Inherited Members
Protected Member Functions inherited from casacore::ArrayPositionIterator
size_t	nextStep ()
	Advance cursor to its next position and tell which dimension stepped. More...
size_t	dimIter () const
	What is the dimensionality of the "step" the cursor takes, i.e. More...
Protected Attributes inherited from casacore::ArrayIterator< T, std::allocator< T > >
std::unique_ptr< Array< T, std::allocator< T > > >	ap_p
	The cursor. More...

Detailed Description

template<typename T, typename Alloc = std::allocator<T>>
class casacore::MatrixIterator< T, Alloc >

Iterate a Matrix cursor through another Array.

Review Status

Reviewed By:

UNKNOWN

Date Reviewed:

before2004/08/25

MatrixIterator steps a Matrix (the "cursor") through an array. The cursor "refers" to storage in the array, so that changing the values in the cursor changes values in the original array.

This class is derived from ArrayIterator; basically it only adds the matrix() member function which allows you to access the cursor as a Matrix.

Tip: The origin of the cursor, i;e; the subarray that moves through the larger array, is always zero;

In this example we want to make a "moment" map of a cube, i.e. collapse the "Z" axis by averaging it.

Cube<float> cube;
MatrixIterator planeIter(cube);
Matrix<float> average(planeIter.matrix().copy()); // init with first plane
planeIter.next(); // advance the iterator
while (! planeIter.pastEnd()) {
average += planeIter.matrix(); // Sum the next plane
planeIter.next();
}
average /= float(cube.shape()(2));  // divide by the number of planes

Definition at line 68 of file MatrixIter.h.

Constructor & Destructor Documentation

MatrixIterator() [1/3]

template<typename T , typename Alloc = std::allocator<T>>

casacore::MatrixIterator< T, Alloc >::MatrixIterator ( Array< T, Alloc > &  a )

explicit

Iterate by matrices through array "a".

The first 2 axes form the cursor axes.

MatrixIterator() [2/3]

template<typename T , typename Alloc = std::allocator<T>>

casacore::MatrixIterator< T, Alloc >::MatrixIterator	(	Array< T, Alloc > &	a,
		size_t	cursorAxis1,
		size_t	cursorAxis2
	)

Iterate by matrices through array "a".

The given axes form the cursor axes.

MatrixIterator() [3/3]

template<typename T , typename Alloc = std::allocator<T>>

casacore::MatrixIterator< T, Alloc >::MatrixIterator ( const MatrixIterator< T, Alloc > &  )

privatedelete

Not implemented.

Member Function Documentation

matrix()

template<typename T , typename Alloc = std::allocator<T>>

Matrix<T, Alloc>& casacore::MatrixIterator< T, Alloc >::matrix ( )

inline

Return the matrix at the current position.

Definition at line 80 of file MatrixIter.h.

References casacore::ArrayIterator< T, std::allocator< T > >::ap_p.

operator=()

template<typename T , typename Alloc = std::allocator<T>>

MatrixIterator<T, Alloc>& casacore::MatrixIterator< T, Alloc >::operator= ( const MatrixIterator< T, Alloc > &  )

privatedelete

Not implemented.

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The documentation for this class was generated from the following file:

• casa/Arrays/MatrixIter.h