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From: | anonymous |
Subject: | [Octave-bug-tracker] [bug #56069] Symbolic Laplace transform of sin(w*t) gives wrong value |
Date: | Wed, 3 Apr 2019 23:57:50 -0400 (EDT) |
User-agent: | Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:66.0) Gecko/20100101 Firefox/66.0 |
URL: <https://savannah.gnu.org/bugs/?56069> Summary: Symbolic Laplace transform of sin(w*t) gives wrong value Project: GNU Octave Submitted by: None Submitted on: Thu 04 Apr 2019 03:57:48 AM UTC Category: Octave Forge Package Severity: 3 - Normal Priority: 5 - Normal Item Group: Incorrect Result Status: None Assigned to: None Originator Name: Daniel Connors Originator Email: address@hidden Open/Closed: Open Discussion Lock: Any Release: 5.1.0 Operating System: Microsoft Windows _______________________________________________________ Details: >> pkg load symbolic >> syms a b w t Symbolic pkg v2.7.1: Python communication link active, SymPy v1.3. >> laplace(sin(a*t)) ans = (sym) a ------- 2 2 a + s >> laplace(sin(b*t)) ans = (sym) b ------- 2 2 b + s >> laplace(sin(w*t)) ans = (sym) t ------- 2 2 s + t The Laplace Transform for symbolic variables a and b give the correct result. We see that in the code I provide above. However, the Laplace transform of sin(w*t) gives an incorrect value. We see the incorrect result above. Is w a special variable to Octave? Is Octave getting the wrong variable for integration in the case for w? It's odd that a and b work correctly but w fails. Thank you for looking into this. _______________________________________________________ Reply to this item at: <https://savannah.gnu.org/bugs/?56069> _______________________________________________ Message sent via Savannah https://savannah.gnu.org/
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