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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 absf = require( '@stdlib/math/base/special/absf' );
var maxf = require( '@stdlib/math/base/special/maxf' );
var f32 = require( '@stdlib/number/float64/base/to-float32' );
var FLOAT32_BIGGEST = require( '@stdlib/constants/float32/max' );
var FLOAT32_SMALLEST = require( '@stdlib/constants/float32/smallest-normal' );
var EPS = require( '@stdlib/constants/float32/eps' );
// VARIABLES //
var ONE = f32( 1.0 );
var TWO = f32( 2.0 );
var HALF = f32( 0.5 );
var LARGE_THRESHOLD = f32( FLOAT32_BIGGEST * HALF );
var SMALL_THRESHOLD = f32( FLOAT32_SMALLEST * f32( TWO/EPS ) );
var RECIP_EPS_SQR = f32( TWO / f32(EPS*EPS) );
// MAIN //
/**
* Computes the inverse of a single-precision complex floating-point number and assigns results to a provided output array.
*
* @param {number} re - real component
* @param {number} im - imaginary component
* @param {Collection} out - output array
* @param {integer} strideOut - stride length
* @param {NonNegativeInteger} offsetOut - starting index
* @returns {Collection} output array
*
* @example
* var Float32Array = require( '@stdlib/array/float32' );
*
* var out = assign( 2.0, 4.0, new Float32Array( 2 ), 1, 0 );
* // returns <Float32Array>[ ~0.1, ~-0.2 ]
*/
function assign( re, im, out, strideOut, offsetOut ) {
var ab;
var s;
var r;
var t;
ab = maxf( absf( re ), absf( im ) );
s = ONE;
if ( ab >= LARGE_THRESHOLD ) {
re = f32( re * HALF );
im = f32( im * HALF );
s = f32( s * HALF );
} else if ( ab <= SMALL_THRESHOLD ) {
re = f32( re * RECIP_EPS_SQR );
im = f32( im * RECIP_EPS_SQR );
s = f32( s * RECIP_EPS_SQR );
}
if ( absf( im ) <= absf( re ) ) {
r = f32( im / re );
t = f32( ONE / f32( re + f32(im*r) ) );
re = t;
im = f32( -r * t );
} else {
r = f32( re / im );
t = f32( ONE / f32( im + f32(re*r) ) );
re = f32( r * t );
im = -t;
}
out[ offsetOut ] = f32( re * s );
out[ offsetOut+strideOut ] = f32( im * s );
return out;
}
// EXPORTS //
module.exports = assign;
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