R Plotting two datasets with smoothScatter() with the same color scheme

问题

I would like to plot the two dimensional densities of two different datasets using the smoothScatter() function:

smoothScatter(confdiffCovCorrect$meth.diff, confdiffCovCorrect$qvalue)
smoothScatter(logdiffCovCorrect$meth.diff, logdiffCovCorrect$qvalue)`

But, in order to compare the two datasets using the plots, I want the color code to be identical. That is, I want a given value Xi of the density function to correspond to the same color in both plots.

Is this possible?

来源：https://stackoverflow.com/questions/29891478/r-plotting-two-datasets-with-smoothscatter-with-the-same-color-scheme