First time user, so sorry if I don't understand protocol.. Anyway, I have
created a data frame consisting of pearson's R values at various x and y
coordinates and then plotted this using filled.contour. My data is similar
to fMRI data except that it is a surface map reconstructed from
histological sections. I like the results but would like to know how
contours were detected. Google search provides me various sources claiming
the algorithm used is undocumented. For example:


http://wipaed.wiso.uni-goettingen.de/~holdenb1/R/library/base/html/contour.html
"Draws contour lines for the desired levels. There is currently no
documentation about the algorithm. The source code is in
`$RHOME/src/main/plot.c'."


Does anyone know where or how I can find the method by which contours are
calculated?

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