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Apache OpenOffice (AOO) Bugzilla – Full Text Issue Listing |
| Summary: | ASIN and ACOS return ** Faulty expression ** | ||||||
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| Product: | Writer | Reporter: | Czesław Wolański <czeslaw.wolanski> | ||||
| Component: | ui | Assignee: | AOO issues mailing list <issues> | ||||
| Status: | CONFIRMED --- | QA Contact: | |||||
| Severity: | Minor | ||||||
| Priority: | P5 (lowest) | CC: | rb.henschel | ||||
| Version: | 4.1.7 | ||||||
| Target Milestone: | --- | ||||||
| Hardware: | PC | ||||||
| OS: | Windows 7 | ||||||
| Issue Type: | DEFECT | Latest Confirmation in: | --- | ||||
| Developer Difficulty: | --- | ||||||
| Attachments: |
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It is indeed wrong for argument 1. Workaround: Write the argument of asin as 0,999999999999999 Writer and Calc use different formula engines. To make Writer use the Calc formula engine is such a large effort, that it is out of scope. (In reply to Regina Henschel from comment #1) > It is indeed wrong for argument 1. Workaround: Write the argument of asin as > 0,999999999999999 > > Writer and Calc use different formula engines. To make Writer use the Calc > formula engine is such a large effort, that it is out of scope. Thank you for the clarification and workaround. It seems that one can get the right result using relationships among the inverse trigonometric functions ( cf. https://en.wikipedia.org/wiki/Inverse_trigonometric_functions ). The formulas for 1 / -1 argument are e.g.: ASIN(1) = 2 * ATAN(1) ASIN(-1) = 2 * ATAN(-1) ACOS(1) = 2 * ATAN(0) ACOS(-1) = π - ACOS(1) |
Created attachment 86982 [details] File with formulas and relevant screenshots In AOO Writer the following formulas: =ASIN 1 =ASIN -1 =ACOS 1 =ACOS -1 return ** Expression is faulty ** whereas in AOO Calc one can see the expected values i.e. =ASIN(1) returns 1.57... or π/2 radians =ASIN(-1) returns -1.57... or -π/2 radians =ACOS(1) returns 0 =ACOS(-1) returns 3.14... or π radians Note: Issue also observed in 4.2.0-dev