This is documentation for Mathematica 6, which was
based on an earlier version of the Wolfram Language.
View current documentation (Version 11.2)


MicroscopicErrorPlot[f, {x, a}]
plots the error incurred by using machine arithmetic to evaluate the expression f in a small neighborhood of a.
MicroscopicErrorPlot[f, {x, a, n}]
plots the error from a-n ulps to a+n ulps.
  • The scale on the vertical axis represents the error in ulps.
  • The following option can be given:
JoinedTruewhether to join points
  • With the setting Joined->Real, the line joining the plot points represents the mapping from the set of real numbers to the error in the machine-number output.