Compiled

is an option for various numerical and plotting functions which specifies whether the expressions they work with should automatically be compiled.

Details

On rare occasions, machine-number compilation may produce unexpected results:

Wolfram Language code: FindRoot[If[1 / (1 + Exp[x]) == 0, 0, -1] + x / 900, {x, 0, 1000}]

By default, the function is compiled by FindRoot, so that machine overflow and underflow are not caught:

Wolfram Language code: cf = Compile[{{x, _Real}}, If[1 / (1 + Exp[x]) == 0, 0, -1] + x / 900];Plot[cf[x], {x, 0, 1000}]

Use Compiled->False to prevent this:

Wolfram Language code: FindRoot[If[1 / (1 + Exp[x]) == 0, 0, -1] + x / 900, {x, 0, 1000}, Compiled -> False]

Wolfram Language code: Plot[If[1 / (1 + Exp[x]) == 0, 0, -1] + x / 900, {x, 0, 1000}]

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