Return a read-only shifted view of an input ndarray along a specific dimension.
APACHE-2.0 License
Return a read-only shifted view of an input
ndarray
along a specified dimension.
npm install @stdlib/ndarray-slice-dimension-from
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script
tag without installation and bundlers, use the ES Module available on the esm
branch (see README).deno
branch (see README for usage intructions).umd
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To view installation and usage instructions specific to each branch build, be sure to explicitly navigate to the respective README files on each branch, as linked to above.
var sliceDimensionFrom = require( '@stdlib/ndarray-slice-dimension-from' );
Returns a read-only shifted view of an input ndarray
along a specified dimension.
var ndarray = require( '@stdlib/ndarray-ctor' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var shape = [ 3, 2 ];
var strides = [ 2, 1 ];
var offset = 0;
var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
// returns <ndarray>
var sh = x.shape;
// returns [ 3, 2 ]
var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
var y = sliceDimensionFrom( x, 0, 1 );
// returns <ndarray>
sh = y.shape;
// returns [ 2, 2 ]
arr = ndarray2array( y );
// returns [ [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
The function accepts the following arguments:
ndarray
.-1
.-1
.The function supports the following options
:
By default, the function throws an error when provided a starting index which exceeds array bounds. To return an empty array when a starting index exceeds array bounds, set the strict
option to false
.
var ndarray = require( '@stdlib/ndarray-ctor' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var buffer = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
var shape = [ 3, 2 ];
var strides = [ 2, 1 ];
var offset = 0;
var x = ndarray( 'generic', buffer, shape, strides, offset, 'row-major' );
// returns <ndarray>
var sh = x.shape;
// returns [ 3, 2 ]
var arr = ndarray2array( x );
// returns [ [ 1.0, 2.0 ], [ 3.0, 4.0 ], [ 5.0, 6.0 ] ]
var y = sliceDimensionFrom( x, 1, 20, {
'strict': false
});
// returns <ndarray>
sh = y.shape;
// returns [ 3, 0 ]
arr = ndarray2array( y );
// returns []
var array = require( '@stdlib/ndarray-array' );
var ndarray2array = require( '@stdlib/ndarray-to-array' );
var zeroTo = require( '@stdlib/array-base-zero-to' );
var sliceDimensionFrom = require( '@stdlib/ndarray-slice-dimension-from' );
// Create a linear ndarray buffer:
var buf = zeroTo( 27 );
// Create an ndarray:
var x = array( buf, {
'shape': [ 3, 3, 3 ]
});
// Get the last two rows of each matrix:
var y1 = sliceDimensionFrom( x, 1, 1 );
// returns <ndarray>
var a1 = ndarray2array( y1 );
// returns [ [ [ 3, 4, 5 ], [ 6, 7, 8 ] ], [ [ 12, 13, 14 ], [ 15, 16, 17 ] ], [ [ 21, 22, 23 ], [ 24, 25, 26 ] ] ]
// Get the last columns of each matrix:
var y2 = sliceDimensionFrom( x, 2, 1 );
// returns <ndarray>
var a2 = ndarray2array( y2 );
// returns [ [ [ 1, 2 ], [ 4, 5 ], [ 7, 8 ] ], [ [ 10, 11 ], [ 13, 14 ], [ 16, 17 ] ], [ [ 19, 20 ], [ 22, 23 ], [ 25, 26 ] ] ]
// Get the last two matrices:
var y3 = sliceDimensionFrom( x, 0, 1 );
// returns <ndarray>
var a3 = ndarray2array( y3 );
// returns [ [ [ 9, 10, 11 ], [ 12, 13, 14 ], [ 15, 16, 17 ] ], [ [ 18, 19, 20 ], [ 21, 22, 23 ], [ 24, 25, 26 ] ] ]
@stdlib/ndarray-array
: multidimensional arrays.
@stdlib/ndarray-ctor
: multidimensional array constructor.
@stdlib/ndarray-slice
: return a read-only view of an input ndarray.
@stdlib/ndarray-slice-dimension
: return a read-only view of an input ndarray when sliced along a specified dimension.
@stdlib/ndarray-slice-dimension-to
: return a read-only truncated view of an input ndarray along a specific dimension.
@stdlib/ndarray-slice-from
: return a read-only shifted view of an input ndarray.
This package is part of stdlib, a standard library for JavaScript and Node.js, with an emphasis on numerical and scientific computing. The library provides a collection of robust, high performance libraries for mathematics, statistics, streams, utilities, and more.
For more information on the project, filing bug reports and feature requests, and guidance on how to develop stdlib, see the main project repository.
See LICENSE.
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