MathGroup Archive 2005

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Lisp-like let in Mathematica?


Are functions like

  RealizeGraphicMatroid[G_] :=
    IncidenceMatrix[#] - IncidenceMatrix[ReverseEdges[#]] & @
OrientGraph[G] // Transpose

considered to be good Mathematica style?  This does what I want, but it
has the problem of being written in a right-to-left-to-right style.  Is
there an operator that works like let in Lisp that can give a local
name to a temporary value in an easier to read way?  I guess something
like

  Let[a_ , b_, body_] :=
    (body /. a -> #) & @ b

would work, but I'm relatively new to Mathematica and was wondering if
there is a built-in or less clunky solution.

^L


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