FindRoot anomaly (example from Mathematica Tutorial)

*To*: mathgroup at smc.vnet.net*Subject*: [mg72118] FindRoot anomaly (example from Mathematica Tutorial)*From*: howardfink at gmail.com*Date*: Wed, 13 Dec 2006 06:38:51 -0500 (EST)

FindRoot[3Cos[x] == Log[x], {x, 1}] is on page 12 of the tutorial that starts up in Mathematica 5. I was interested in how the seed affects the answer, so I made a table sol = Table[FindRoot[3Cos[x] == Log[x], {x, b}], {b, 100}]; and then plotted the solutions ListPlot[x /. sol] I got a nice table, but the seed of 22 returns {x -> -207.932 + 1.39227 i]} so the plot returns the error: Graphics::gptn: Coordinate -207.932 + 1.39227\\[ImaginaryI] in {22, -207.932 \ + 1.39227\\[ImaginaryI]} is not a floating-point number. The other 99 results make a nice plot.

**Follow-Ups**:**Re: FindRoot anomaly (example from Mathematica Tutorial)***From:*gardyloo <gardyloo@mail.wsu.edu>