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FunctionInterpolation

FunctionInterpolation[expr, {x, xmin, xmax}]
evaluates expr with x running from xmin to xmax and constructs an InterpolatingFunction object which represents an approximate function corresponding to the result.
FunctionInterpolation[expr, {x, xmin, xmax}, {y, ymin, ymax}, ...]
constructs an InterpolatingFunction object with several arguments.
Computes an InterpolatingFunction representation of Exp[-Sin[x]^2]:
Use the resulting function as any function:
Computes an InterpolatingFunction representation of Exp[-Sin[x]^2]:
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Use the resulting function as any function:
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