Get gradient default colors for plots
gradcols(col_vec = NULL)
A character vector of colors in hexidecimal notation.
chr string of plot colors to use. Any color palette from RColorBrewer can be used as a named input. Palettes from grDevices must be supplied as the returned string of colors for each palette.
This is a convenience function for retrieving a color palette. Palettes from RColorBrewer will use the maximum number of colors. The default palette is 'Spectral'.