99 lines
4.8 KiB
JavaScript
99 lines
4.8 KiB
JavaScript
/* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the License.
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*
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* The Original Code is Mozilla Communicator client code, released March
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* 31, 1998.
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*
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* The Initial Developer of the Original Code is Netscape Communications
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* Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*
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*/
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/**
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File Name: 15.8.2.18.js
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ECMA Section: 15.8.2.18 tan( x )
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Description: return an approximation to the tan of the
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argument. argument is expressed in radians
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special cases:
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- if x is NaN result is NaN
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- if x is 0 result is 0
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- if x is -0 result is -0
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- if x is Infinity or -Infinity result is NaN
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Author: christine@netscape.com
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Date: 7 july 1997
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*/
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var SECTION = "15.8.2.18";
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var VERSION = "ECMA_1";
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startTest();
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var TITLE = "Math.tan(x)";
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var EXCLUDE = "true";
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writeHeaderToLog( SECTION + " "+ TITLE);
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var testcases = getTestCases();
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test();
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function getTestCases() {
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var array = new Array();
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var item = 0;
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array[item++] = new TestCase( SECTION, "Math.tan.length", 1, Math.tan.length );
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array[item++] = new TestCase( SECTION, "Math.tan()", Number.NaN, Math.tan() );
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array[item++] = new TestCase( SECTION, "Math.tan(void 0)", Number.NaN, Math.tan(void 0));
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array[item++] = new TestCase( SECTION, "Math.tan(null)", 0, Math.tan(null) );
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array[item++] = new TestCase( SECTION, "Math.tan(false)", 0, Math.tan(false) );
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array[item++] = new TestCase( SECTION, "Math.tan(NaN)", Number.NaN, Math.tan(Number.NaN) );
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array[item++] = new TestCase( SECTION, "Math.tan(0)", 0, Math.tan(0));
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array[item++] = new TestCase( SECTION, "Math.tan(-0)", -0, Math.tan(-0));
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array[item++] = new TestCase( SECTION, "Math.tan(Infinity)", Number.NaN, Math.tan(Number.POSITIVE_INFINITY));
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array[item++] = new TestCase( SECTION, "Math.tan(-Infinity)", Number.NaN, Math.tan(Number.NEGATIVE_INFINITY));
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array[item++] = new TestCase( SECTION, "Math.tan(Math.PI/4)", 1, Math.tan(Math.PI/4));
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array[item++] = new TestCase( SECTION, "Math.tan(3*Math.PI/4)", -1, Math.tan(3*Math.PI/4));
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array[item++] = new TestCase( SECTION, "Math.tan(Math.PI)", -0, Math.tan(Math.PI));
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array[item++] = new TestCase( SECTION, "Math.tan(5*Math.PI/4)", 1, Math.tan(5*Math.PI/4));
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array[item++] = new TestCase( SECTION, "Math.tan(7*Math.PI/4)", -1, Math.tan(7*Math.PI/4));
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array[item++] = new TestCase( SECTION, "Infinity/Math.tan(-0)", -Infinity, Infinity/Math.tan(-0) );
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/*
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Arctan (x) ~ PI/2 - 1/x for large x. For x = 1.6x10^16, 1/x is about the last binary digit of double precision PI/2.
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That is to say, perturbing PI/2 by this much is about the smallest rounding error possible.
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This suggests that the answer Christine is getting and a real Infinity are "adjacent" results from the tangent function. I
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suspect that tan (PI/2 + one ulp) is a negative result about the same size as tan (PI/2) and that this pair are the closest
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results to infinity that the algorithm can deliver.
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In any case, my call is that the answer we're seeing is "right". I suggest the test pass on any result this size or larger.
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= C =
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*/
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array[item++] = new TestCase( SECTION, "Math.tan(3*Math.PI/2) >= 5443000000000000", true, Math.tan(3*Math.PI/2) >= 5443000000000000 );
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array[item++] = new TestCase( SECTION, "Math.tan(Math.PI/2) >= 5443000000000000", true, Math.tan(Math.PI/2) >= 5443000000000000 );
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return ( array );
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}
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function test() {
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for ( tc=0; tc < testcases.length; tc++ ) {
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testcases[tc].passed = writeTestCaseResult(
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testcases[tc].expect,
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testcases[tc].actual,
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testcases[tc].description +" = "+
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testcases[tc].actual );
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testcases[tc].reason += ( testcases[tc].passed ) ? "" : "wrong value ";
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}
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stopTest();
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return ( testcases );
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}
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