Use prebuilt color palettes
In celebration of your text mining skills, you may have had too many glasses of chardonnay while listening to Marvin Gaye. So if you find yourself unable to pick colors on your own, you can use the viridisLite
package. viridisLite
color schemes are perceptually-uniform, both in regular form and when converted to black-and-white. The colors are also designed to be perceived by readers with color blindness.
There are multiple color palettes, each with a convenience function. Simply specify n
to select the number of colors needed.
magma(n = 3)
plasma(n = 5)
inferno(n = 6)
Each function returns a vector of hexadecimal colors based on n
.
Here's an example used with wordcloud
:
color_pal <- cividis(n = 7)
wordcloud(chardonnay_freqs$term, chardonnay_freqs$num, max.words = 100, colors = color_pal)
This exercise is part of the course
Text Mining with Bag-of-Words in R
Exercise instructions
- Use
cividis()
to select5
colors in an object calledcolor_pal
. - Review the hexadecimal colors by printing
color_pal
to your console. - Create a
wordcloud()
from thechardonnay_freqs
term
andnum
columns. Include the top 100 terms usingmax.words
, and set thecolors
to your palette,color_pal
.
Hands-on interactive exercise
Have a go at this exercise by completing this sample code.
# Select 5 colors
___ <- ___(___)
# Examine the palette output
___
# Create a word cloud with the selected palette
___(___)