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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

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