95 lines
2.4 KiB
Plaintext
95 lines
2.4 KiB
Plaintext
|
|
||
|
|
{{alias}}( N, x, stride )
|
||
|
|
Computes the arithmetic mean of a double-precision floating-point strided
|
||
|
|
array using pairwise summation.
|
||
|
|
|
||
|
|
The `N` and `stride` parameters determine which elements in `x` are accessed
|
||
|
|
at runtime.
|
||
|
|
|
||
|
|
Indexing is relative to the first index. To introduce an offset, use a typed
|
||
|
|
array view.
|
||
|
|
|
||
|
|
If `N <= 0`, the function returns `NaN`.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
N: integer
|
||
|
|
Number of indexed elements.
|
||
|
|
|
||
|
|
x: Float64Array
|
||
|
|
Input array.
|
||
|
|
|
||
|
|
stride: integer
|
||
|
|
Index increment.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
out: number
|
||
|
|
The arithmetic mean.
|
||
|
|
|
||
|
|
Examples
|
||
|
|
--------
|
||
|
|
// Standard Usage:
|
||
|
|
> var x = new {{alias:@stdlib/array/float64}}( [ 1.0, -2.0, 2.0 ] );
|
||
|
|
> {{alias}}( x.length, x, 1 )
|
||
|
|
~0.3333
|
||
|
|
|
||
|
|
// Using `N` and `stride` parameters:
|
||
|
|
> x = new {{alias:@stdlib/array/float64}}( [ -2.0, 1.0, 1.0, -5.0, 2.0, -1.0 ] );
|
||
|
|
> var N = {{alias:@stdlib/math/base/special/floor}}( x.length / 2 );
|
||
|
|
> var stride = 2;
|
||
|
|
> {{alias}}( N, x, stride )
|
||
|
|
~0.3333
|
||
|
|
|
||
|
|
// Using view offsets:
|
||
|
|
> var x0 = new {{alias:@stdlib/array/float64}}( [ 1.0, -2.0, 3.0, 2.0, 5.0, -1.0 ] );
|
||
|
|
> var x1 = new {{alias:@stdlib/array/float64}}( x0.buffer, x0.BYTES_PER_ELEMENT*1 );
|
||
|
|
> N = {{alias:@stdlib/math/base/special/floor}}( x0.length / 2 );
|
||
|
|
> stride = 2;
|
||
|
|
> {{alias}}( N, x1, stride )
|
||
|
|
~-0.3333
|
||
|
|
|
||
|
|
{{alias}}.ndarray( N, x, stride, offset )
|
||
|
|
Computes the arithmetic mean of a double-precision floating-point strided
|
||
|
|
array using pairwise summation and alternative indexing semantics.
|
||
|
|
|
||
|
|
While typed array views mandate a view offset based on the underlying
|
||
|
|
buffer, the `offset` parameter supports indexing semantics based on a
|
||
|
|
starting index.
|
||
|
|
|
||
|
|
Parameters
|
||
|
|
----------
|
||
|
|
N: integer
|
||
|
|
Number of indexed elements.
|
||
|
|
|
||
|
|
x: Float64Array
|
||
|
|
Input array.
|
||
|
|
|
||
|
|
stride: integer
|
||
|
|
Index increment.
|
||
|
|
|
||
|
|
offset: integer
|
||
|
|
Starting index.
|
||
|
|
|
||
|
|
Returns
|
||
|
|
-------
|
||
|
|
out: number
|
||
|
|
The arithmetic mean.
|
||
|
|
|
||
|
|
Examples
|
||
|
|
--------
|
||
|
|
// Standard Usage:
|
||
|
|
> var x = new {{alias:@stdlib/array/float64}}( [ 1.0, -2.0, 2.0 ] );
|
||
|
|
> {{alias}}.ndarray( x.length, x, 1, 0 )
|
||
|
|
~0.3333
|
||
|
|
|
||
|
|
// Using offset parameter:
|
||
|
|
> var x = new {{alias:@stdlib/array/float64}}( [ 1.0, -2.0, 3.0, 2.0, 5.0, -1.0 ] );
|
||
|
|
> var N = {{alias:@stdlib/math/base/special/floor}}( x.length / 2 );
|
||
|
|
> {{alias}}.ndarray( N, x, 2, 1 )
|
||
|
|
~-0.3333
|
||
|
|
|
||
|
|
See Also
|
||
|
|
--------
|
||
|
|
|