Using PGFPlots to plot macro result

Question

I've got a few macros that perform floating point lookups and calculations for me and I'm interesting in plotting their results. They're the kind of calculation which requires if/else, so they can't be easily written as a simple math formula for \addplot. I've been able to plot the results using a \foreach, but only by having a separate \addplot for each point in the series:

\foreach \x in {1,...,100}{
  \edef\temp{\noexpand \addplot coordinates{ (\x,\myMacro{\x}) }; }
  \temp
}

Granted, I'm sure that I could force it to look like one data series, but that seems like a very inelegant solution. Is it possible to define a data series where y values are provided by a LaTeX macro? Something like

\addplot{
   \coordinates{
     foreach \x in {1,...,100){
       (\x,\myMacro{\x})
     }
   }
};

or

\addplot[variableICanPassToMacro=\x, domain=1:100] ({\x},{\myMacro{\x}});

?