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* @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 format = require( '@stdlib/string/format' );
var FLOAT16 = require( '@stdlib/constants/float16/smallest-normal' );
var FLOAT32 = require( '@stdlib/constants/float32/smallest-normal' );
var FLOAT64 = require( '@stdlib/constants/float64/smallest-normal' );
// MAIN //
/**
* Returns the smallest positive normal value capable of being represented by a numeric real type.
*
* @param {string} dtype - numeric type
* @throws {TypeError} must provide a recognized numeric type
* @returns {number} smallest positive normal value
*
* @example
* var m = realmin( 'float64' );
* // returns 2.2250738585072014e-308
*
* @example
* var m = realmin( 'float16' );
* // returns 0.00006103515625
*
* @example
* var m = realmin( 'float32' );
* // returns 1.1754943508222875e-38
*/
function realmin( dtype ) {
switch ( dtype ) {
case 'float64':
return FLOAT64;
case 'float32':
return FLOAT32;
case 'float16':
return FLOAT16;
default:
throw new TypeError( format( 'invalid argument. Must provide a recognized type. Value: `%s`.', dtype ) );
}
}
// EXPORTS //
module.exports = realmin;
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