Details

This message is generated when the argument passed to an InterpolatingFunction expression falls outside the range of the interpolation.
Extrapolation outside of the range of the interpolation can give misleading results.
Off[message] switches off the message; On[message] switches it on. For example: Off[InterpolatingFunction::dmval].

Examples

The point at which the InterpolatingFunction expression is evaluated is beyond the range of the interpolation:

Wolfram Language code: interp = Interpolation[{{2, 3.7}, {3, 6.5}, {5, 1.8}, {8, 2.1}}]

Wolfram Language code: interp[20]

There is no difficulty if the InterpolatingFunction expression is evaluated within the range of the interpolation:

Wolfram Language code: interp[4]

Clear the value of interp:

Wolfram Language code: Clear[interp]

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