fdim

Undocumented in source but is binding to C. You might be able to learn more by searching the web for its name.
  1. double fdim(double x, double y)
    version(FreeBSD)
    extern (C)
    double
    fdim
    (
    double x
    ,
    double y
    )
  2. double fdim(double x, double y)

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