conditionalMean - Create data for conditional mean plots

Given a plotfile, a conditioning variable, and a list of variables, create data files, each containing conditional means and standard deviations in each of a set of bins of the conditioning variable. Use plotJpdf.m from the Scripts folder to plot the resulting data in matlab/octave, using a line for the mean, and a gray shaded region for the values within a standard-deviation of the mean.

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