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* @license Apache-2.0
*
* Copyright (c) 2022 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 real = require( '@stdlib/complex/float64/real' );
var imag = require( '@stdlib/complex/float64/imag' );
var realf = require( '@stdlib/complex/float32/real' );
var imagf = require( '@stdlib/complex/float32/imag' );
// MAIN //
/**
* Generates a linearly spaced complex number sequence over a specified interval and assigns the results to a provided output array strided view.
*
* @private
* @param {(Float32Array|Float64Array)} out - output array strided view
* @param {string} dt1 - start value data type
* @param {(number|ComplexLike)} start - start of interval
* @param {string} dt2 - stop value data type
* @param {(number|ComplexLike)} stop - end of interval
* @param {NonNegativeInteger} len - length of output array
* @param {boolean} endpoint - boolean indicating whether to include `stop` in the output array
* @returns {(Float32Array|Float64Array)} complex number array view
*/
function linspace( out, dt1, start, dt2, stop, len, endpoint ) {
var re1;
var re2;
var im1;
var im2;
var dr;
var di;
var N;
var i;
var j;
if ( len === 0 ) {
return out;
}
if ( dt1 === 'float64' ) {
re1 = start;
im1 = 0.0;
} else if ( dt1 === 'complex64' ) {
re1 = realf( start );
im1 = imagf( start );
} else {
re1 = real( start );
im1 = imag( start );
}
if ( dt2 === 'float64' ) {
re2 = stop;
im2 = 0.0;
} else if ( dt2 === 'complex64' ) {
re2 = realf( stop );
im2 = imagf( stop );
} else {
re2 = real( stop );
im2 = imag( stop );
}
// Set the first value:
if ( len === 1 ) {
if ( endpoint ) {
out[ 0 ] = re2;
out[ 1 ] = im2;
} else {
out[ 0 ] = re1;
out[ 1 ] = im1;
}
return out;
}
out[ 0 ] = re1;
out[ 1 ] = im1;
// Calculate the increments:
if ( endpoint ) {
N = len - 1;
} else {
N = len;
}
dr = ( re2-re1 ) / N;
di = ( im2-im1 ) / N;
// Generate linearly spaced complex numbers:
j = 2;
for ( i = 1; i < N; i++ ) {
out[ j ] = re1 + (dr*i);
out[ j+1 ] = im1 + (di*i);
j += 2;
}
// Check whether to include the `stop` value in the output array:
if ( endpoint ) {
out[ j ] = re2;
out[ j+1 ] = im2;
}
return out;
}
// EXPORTS //
module.exports = linspace;
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