time-to-botec/squiggle/node_modules/@stdlib/random/base/invgamma/lib/validate.js
NunoSempere b6addc7f05 feat: add the node modules
Necessary in order to clearly see the squiggle hotwiring.
2022-12-03 12:44:49 +00:00

56 lines
1.3 KiB
JavaScript

/**
* @license Apache-2.0
*
* Copyright (c) 2018 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 isPositive = require( '@stdlib/assert/is-positive-number' ).isPrimitive;
// MAIN //
/**
* Validates parameters.
*
* @private
* @param {PositiveNumber} alpha - shape parameter
* @param {PositiveNumber} beta - scale parameter
* @returns {(Error|null)} error or null
*
* @example
* var err = validate( 1.0, 2.0 );
* if ( err ) {
* throw err;
* }
*/
function validate( alpha, beta ) {
if ( !isPositive( alpha ) ) {
return new TypeError( 'invalid argument. `alpha` must be a positive number. Value: `' + alpha + '`.' );
}
if ( !isPositive( beta ) ) {
return new TypeError( 'invalid argument. `beta` must be a positive number. Value: `' + beta + '`.' );
}
return null;
}
// EXPORTS //
module.exports = validate;