solve hangs on Arc Functions
- To: mathgroup at yoda.ncsa.uiuc.edu (mathgroup for mathematica)
- Subject: solve hangs on Arc Functions
- From: Steven Warwick <sdw at hpsadsdw.hp.com>
- Date: Wed, 5 Sep 90 9:11:48 PDT
There appears to be a bug in solve in which expressions involving Arc Trig functions cause Mma to hang with no return... ***************** This hangs In[3]:= ww==ArcCos[ (4-ts^2 wc^2)/ (4+ts^2 wc^2)] 2 2 4 - ts wc Out[3]= ww == ArcCos[-----------] 2 2 4 + ts wc In[4]:= Solve[%,wc] *********** this doesn't ********** In[4]:= Cos[wt] == (4-ts^2 wc^2)/ (4+ts^2 wc^2) 2 2 4 - ts wc Out[4]= Cos[wt] == ----------- 2 2 4 + ts wc In[5]:= Solve[%,wc] Sqrt[4 - 4 Cos[wt]] Sqrt[4 - 4 Cos[wt]] Out[5]= {{wc -> -----------------------}, {wc -> -(-----------------------)}} 2 2 2 2 Sqrt[ts + ts Cos[wt]] Sqrt[ts + ts Cos[wt]] ********************************** Watch out..... -- Steven Warwick Hewlett-Packard sdw at hpsad