Student Support Forum: 'Solving quadratic equation' topicStudent Support Forum > General > Archives > "Solving quadratic equation"

 < Previous Comment | Next Comment > Help | Reply To Comment | Reply To Topic
 Author Comment/Response Bill Simpson 02/02/13 11:41pm Can you apply something like this? Some made up b values In[2]:= b=RandomReal[{-2,2},5] Out[2]= {-1.60966,0.503958,-1.05172,1.00248,-0.911008} A made up quadratic that uses one b value each time In[3]:= sols=t/.Map[Solve[2t^2+# t-6==0,t]&,b] Out[3]= {{-1.37577,2.1806},{-1.86262,1.61064},{-1.48896,2.01482},{-2.00071,1.49947},{-1.51921,1.97471}} In[4]:= positivesols=DeleteCases[Flatten[sols],t_/;t<0] Out[4]= {2.1806,1.61064,2.01482,1.49947,1.97471} Test this carefully before you depend on it. Note that it doesn't let you know if there were zero, one or two positive roots, it just gives you the positive values. URL: ,

 Subject (listing for 'Solving quadratic equation') Author Date Posted Solving quadratic equation matt 02/02/13 3:19pm Re: Solving quadratic equation Bill Simpson 02/02/13 11:41pm Re: Solving quadratic equation yehuda 02/03/13 03:23am
 < Previous Comment | Next Comment > Help | Reply To Comment | Reply To Topic