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functions, packages, and contexts

  • To: mathgroup at
  • Subject: [mg24991] functions, packages, and contexts
  • From: Matt.Johnson at
  • Date: Fri, 1 Sep 2000 01:09:26 -0400 (EDT)
  • Sender: owner-wri-mathgroup at

Dear All -

I am new to the package-writing frontier and am running into a problem I
can't seem to overcome.  The first package I have defines a molecular
weight (MW) function, which takes a molecule as an argument and returns the
molecular weght.  The molecule must be of the form C1O2, for carbon
dioxide, for example (each element is followed by the number of atoms of
that element). The problem I have is that now I am using that package
within another package.  Because the context has been changed, the
molecules are sent to the MW function as Global`MyPackages`React`C1O2 where
React is the package I am working in.  The MW function has been written to
pick out elements and numbers, but cannot handle the additional input of
the context path.   Is there an easy fix for this, i.e. is there a way to
send the MW function just the molecular notation within the package without
including the context?  Or do I have to define the MW function to pick off
the C1O2 from the variable for it to work?



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