124 lines
3.3 KiB
Plaintext
124 lines
3.3 KiB
Plaintext
|
|
{{alias}}( N, alpha, x, strideX, y, strideY )
|
|
Multiplies `x` by a constant `alpha` and adds the result to `y`.
|
|
|
|
The `N` and `stride` parameters determine which elements in `x` and `y` are
|
|
accessed at runtime.
|
|
|
|
Indexing is relative to the first index. To introduce an offset, use typed
|
|
array views.
|
|
|
|
If `N <= 0` or `alpha == 0`, the function returns `y` unchanged.
|
|
|
|
Parameters
|
|
----------
|
|
N: integer
|
|
Number of indexed elements.
|
|
|
|
alpha: number
|
|
Constant.
|
|
|
|
x: Array<number>|TypedArray
|
|
Input array.
|
|
|
|
strideX: integer
|
|
Index increment for `x`.
|
|
|
|
y: Array<number>|TypedArray
|
|
Destination array.
|
|
|
|
strideY: integer
|
|
Index increment for `y`.
|
|
|
|
Returns
|
|
-------
|
|
y: Array<number>|TypedArray
|
|
Input array `y`.
|
|
|
|
Examples
|
|
--------
|
|
// Standard usage:
|
|
> var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
|
|
> var y = [ 1.0, 1.0, 1.0, 1.0, 1.0 ];
|
|
> var alpha = 5.0;
|
|
> {{alias}}( x.length, alpha, x, 1, y, 1 )
|
|
[ 6.0, 11.0, 16.0, 21.0, 26.0 ]
|
|
|
|
// Using `N` and `stride` parameters:
|
|
> x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
|
|
> y = [ 1.0, 1.0, 1.0, 1.0, 1.0, 1.0 ];
|
|
> var N = {{alias:@stdlib/math/base/special/floor}}( x.length / 2 );
|
|
> {{alias}}( N, alpha, x, 2, y, -1 )
|
|
[ 26.0, 16.0, 6.0, 1.0, 1.0, 1.0 ]
|
|
|
|
// Using view offsets:
|
|
> var x0 = new {{alias:@stdlib/array/float64}}( [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ] );
|
|
> var y0 = new {{alias:@stdlib/array/float64}}( [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ] );
|
|
> var x1 = new {{alias:@stdlib/array/float64}}( x0.buffer, x0.BYTES_PER_ELEMENT*1 );
|
|
> var y1 = new {{alias:@stdlib/array/float64}}( y0.buffer, y0.BYTES_PER_ELEMENT*3 );
|
|
> N = {{alias:@stdlib/math/base/special/floor}}( x0.length / 2 );
|
|
> {{alias}}( N, 5.0, x1, -2, y1, 1 )
|
|
<Float64Array>[ 40.0, 31.0, 22.0 ]
|
|
> y0
|
|
<Float64Array>[ 7.0, 8.0, 9.0, 40.0, 31.0, 22.0 ]
|
|
|
|
|
|
{{alias}}.ndarray( N, alpha, x, strideX, offsetX, y, strideY, offsetY )
|
|
Multiplies `x` by a constant `alpha` and adds the result to `y`, with
|
|
alternative indexing semantics.
|
|
|
|
While typed array views mandate a view offset based on the underlying
|
|
buffer, the `offsetX` and `offsetY` parameters support indexing semantics
|
|
based on starting indices.
|
|
|
|
Parameters
|
|
----------
|
|
N: integer
|
|
Number of indexed elements.
|
|
|
|
alpha: number
|
|
Constant.
|
|
|
|
x: Array<number>|TypedArray
|
|
Input array.
|
|
|
|
strideX: integer
|
|
Index increment for `x`.
|
|
|
|
offsetX: integer
|
|
Starting index for `x`.
|
|
|
|
y: Array<number>|TypedArray
|
|
Destination array.
|
|
|
|
strideY: integer
|
|
Index increment for `y`.
|
|
|
|
offsetY: integer
|
|
Starting index for `y`.
|
|
|
|
Returns
|
|
-------
|
|
y: Array<number>|TypedArray
|
|
Input array `y`.
|
|
|
|
Examples
|
|
--------
|
|
// Standard usage:
|
|
> var x = [ 1.0, 2.0, 3.0, 4.0, 5.0 ];
|
|
> var y = [ 1.0, 1.0, 1.0, 1.0, 1.0 ];
|
|
> var alpha = 5.0;
|
|
> {{alias}}.ndarray( x.length, alpha, x, 1, 0, y, 1, 0 )
|
|
[ 6.0, 11.0, 16.0, 21.0, 26.0 ]
|
|
|
|
// Advanced indexing:
|
|
> x = [ 1.0, 2.0, 3.0, 4.0, 5.0, 6.0 ];
|
|
> y = [ 7.0, 8.0, 9.0, 10.0, 11.0, 12.0 ];
|
|
> var N = {{alias:@stdlib/math/base/special/floor}}( x.length / 2 );
|
|
> {{alias}}.ndarray( N, alpha, x, 2, 1, y, -1, y.length-1 )
|
|
[ 7.0, 8.0, 9.0, 40.0, 31.0, 22.0 ]
|
|
|
|
See Also
|
|
--------
|
|
|