Purpose

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  A wrapper function used internally to linmin. Feeds a
  multidimensional function to brent and bracket.

Inputs

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  lambda: Position along the line

Keyword Parameters

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  point: The starting point for the line
  dir: A vector giving the direction of the line
  linfunc: A user written function to minimize. Evaluated at(point +
          lambda * dir)
  _extra: Any extra keywords are passed to linfunc.
 

Outputs

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  linfunc(point + lambda * dir, _extra = extra)