add another example to visualize viridis palette

sjmgarnier / viridis

Colorblind-Friendly Color Maps for R

http://sjmgarnier.github.io/viridis

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Closed timelyportfolio closed 9 years ago

timelyportfolio commented 9 years ago

add example for roxygen using code from RColorBrewer::display.brewer.pal to show the viridis palette. I did not rerun roxygen.