No extrapolation warning on Plot

*To*: mathgroup at smc.vnet.net*Subject*: [mg112951] No extrapolation warning on Plot*From*: Simon Pearce <Simon.Pearce at nottingham.ac.uk>*Date*: Thu, 7 Oct 2010 03:37:36 -0400 (EDT)

Hi Mathgroup, I've found that Plot often doesn't let me know when it is extrapolating outside an interpolating function's domain. For example, sub1 = = NDSolve[{y''[x]+y[x]==0,y[0]==1,y'[0]==0},y,{x,0,1}]; sub2 = = NDSolve[{y''[x]+y[x]==0,y[0]==1,y'[0]==0},y,{x,0,0.05}]; Plot[{y[x]/.sub1,y[x]/.sub2},{x,0,1}] Here Plot has extrapolated wildly, but no warning message occurs. Thanks, Simon = This message and any attachment are intended solely for the addressee a= nd may contain confidential information. If you have received this mess= age in error, please send it back to me, and immediately delete it. P= lease do not use, copy or disclose the information contained in this me= ssage or in any attachment. Any views or opinions expressed by the aut= hor of this email do not necessarily reflect the views of the Universit= y of Nottingham.=0D=0A=0D=0AThis message has been checked for viruses b= ut the contents of an attachment=0D=0Amay still contain software viruse= s which could damage your computer system:=0D=0Ayou are advised to perf= orm your own checks. Email communications with the=0D=0AUniversity of N= ottingham may be monitored as permitted by UK legislation.=