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* @license Apache-2.0
*
* Copyright (c) 2026 The Stdlib Authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
'use strict';
// MODULES //
var dtypes = require( '@stdlib/ndarray/dtypes' );
var gstdev = require( '@stdlib/stats/base/ndarray/stdev' );
var dstdev = require( '@stdlib/stats/base/ndarray/dstdev' );
var sstdev = require( '@stdlib/stats/base/ndarray/sstdev' );
var factory = require( '@stdlib/ndarray/base/unary-reduce-strided1d-dispatch-factory' );
// VARIABLES //
var idtypes = dtypes( 'real_and_generic' );
var odtypes = dtypes( 'real_floating_point_and_generic' );
var policies = {
'output': 'real_floating_point_and_generic',
'casting': 'none'
};
var table = {
'types': [
'float64', // input
'float32' // input
],
'fcns': [
dstdev,
sstdev
],
'default': gstdev
};
// MAIN //
/**
* Computes the standard deviation along one or more ndarray dimensions.
*
* @name stdev
* @type {Function}
* @param {ndarray} x - input ndarray
* @param {ndarray} correction - zero-dimensional ndarray specifying degrees of freedom adjustment
* @param {Options} [options] - function options
* @param {IntegerArray} [options.dims] - list of dimensions over which to perform a reduction
* @param {boolean} [options.keepdims=false] - boolean indicating whether the reduced dimensions should be included in the returned ndarray as singleton dimensions
* @param {*} [options.dtype] - output ndarray data type
* @throws {TypeError} first argument must be an ndarray-like object
* @throws {TypeError} second argument must be an ndarray-like object
* @throws {TypeError} options argument must be an object
* @throws {RangeError} dimension indices must not exceed input ndarray bounds
* @throws {RangeError} number of dimension indices must not exceed the number of input ndarray dimensions
* @throws {Error} must provide valid options
* @returns {ndarray} output ndarray
*
* @example
* var Float64Array = require( '@stdlib/array/float64' );
* var ndarray = require( '@stdlib/ndarray/ctor' );
* var scalar2ndarray = require( '@stdlib/ndarray/from-scalar' );
*
* // Create a data buffer:
* var xbuf = new Float64Array( [ 1.0, -2.0, 2.0, 4.0, 3.0, 6.0 ] );
*
* // Define the shape of the input array:
* var sh = [ 3, 2 ];
*
* // Define the array strides:
* var sx = [ 2, 1 ];
*
* // Define the index offset:
* var ox = 0;
*
* // Create an input ndarray:
* var x = new ndarray( 'float64', xbuf, sh, sx, ox, 'row-major' );
*
* // Create a correction ndarray (Bessel's correction for sample stdev):
* var correction = scalar2ndarray( 1.0, {
* 'dtype': 'float64'
* });
*
* // Perform reduction:
* var out = stdev( x, correction );
* // returns <ndarray>
*/
var stdev = factory(table, [idtypes, idtypes], odtypes, policies);
// EXPORTS //
module.exports = stdev;
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