Set the off-diagonal elements and the diagonal elements of a double-precision floating-point matrix to specified values.
var dlaset = require( '@stdlib/lapack/base/dlaset' );Sets the off-diagonal elements and the diagonal elements of a double-precision floating-point matrix to specified values.
var Float64Array = require( '@stdlib/array/float64' );
var A = new Float64Array( 4 );
dlaset( 'row-major', 'all', 2, 2, 2.0, 1.0, A, 2 );
// A => <Float64Array>[ 1.0, 2.0, 2.0, 1.0 ]The function has the following parameters:
- order: storage layout.
- uplo: specifies whether to set the upper or lower triangular/trapezoidal part of a matrix
A. - M: number of rows in
A. - N: number of columns in
A. - alpha: value assigned to off-diagonal elements.
- beta: value assigned to diagonal elements.
- A: input
Float64Array. - LDA: stride of the first dimension of
A(a.k.a., leading dimension of the matrixA).
Note that indexing is relative to the first index. To introduce an offset, use typed array views.
var Float64Array = require( '@stdlib/array/float64' );
// Initial array:
var A0 = new Float64Array( 5 );
// Create offset view:
var A1 = new Float64Array( A0.buffer, A0.BYTES_PER_ELEMENT*1 ); // start at 2nd element
dlaset( 'row-major', 'all', 2, 2, 2.0, 1.0, A1, 2 );
// A0 => <Float64Array>[ 0.0, 1.0, 2.0, 2.0, 1.0 ]Sets the off-diagonal elements and the diagonal elements of a double-precision floating-point matrix to specified values using alternative indexing semantics.
var Float64Array = require( '@stdlib/array/float64' );
var A = new Float64Array( 4 );
dlaset.ndarray( 'all', 2, 2, 2.0, 1.0, A, 2, 1, 0 );
// A => <Float64Array>[ 1.0, 2.0, 2.0, 1.0 ]The function has the following parameters:
- uplo: specifies whether to set the upper or lower triangular/trapezoidal part of a matrix
A. - M: number of rows in
A. - N: number of columns in
A. - alpha: value assigned to off-diagonal elements.
- beta: value assigned to diagonal elements.
- A: input
Float64Array. - sa1: stride of the first dimension of
A. - sa2: stride of the second dimension of
A. - oa: starting index for
A.
While typed array views mandate a view offset based on the underlying buffer, the offset parameter supports indexing semantics based on a starting index. For example,
var Float64Array = require( '@stdlib/array/float64' );
var A = new Float64Array( 5 );
dlaset.ndarray( 'all', 2, 2, 2.0, 1.0, A, 2, 1, 1 );
// A => <Float64Array>[ 0.0, 1.0, 2.0, 2.0, 1.0 ]var ndarray2array = require( '@stdlib/ndarray/base/to-array' );
var uniform = require( '@stdlib/random/array/discrete-uniform' );
var numel = require( '@stdlib/ndarray/base/numel' );
var shape2strides = require( '@stdlib/ndarray/base/shape2strides' );
var dlaset = require( '@stdlib/lapack/base/dlaset' );
var shape = [ 5, 8 ];
var order = 'row-major';
var strides = shape2strides( shape, order );
var N = numel( shape );
var A = uniform( N, -10, 10, {
'dtype': 'float64'
});
console.log( ndarray2array( A, shape, strides, 0, order ) );
dlaset( order, 'all', shape[ 0 ], shape[ 1 ], 2.0, 3.0, A, strides[ 0 ] );
console.log( ndarray2array( A, shape, strides, 0, order ) );TODOTODO.
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