How to choose colors according to rainbow in R language

This article introduces the relevant knowledge of "how to take color according to rainbow in R language". In the operation process of actual cases, many people will encounter such difficulties. Next, let Xiaobian lead you to learn how to deal with these situations! I hope you can read carefully and learn something!

rainbow() to get rainbow swatches

rainbow(n, s = 1, v = 1, start = 0, end = max(1, n - 1)/n, alpha = 1)

For example, 10 colors are obtained based on rainbow color gradient, which are sequentially refined by red, yellow, green, cyan, green, blue, magenta, etc.:

> rainbow(10) [1] "#FF0000FF" "#FF9900FF" "#CCFF00FF" "#33FF00FF" "#00FF66FF" "#00FFFFFF" "#0066FFFF" [8] "#3300FFFF" "#CC00FFFF" "#FF0099FF"

The corresponding colors appear as follows (draw ten incremental columns and fill them with the corresponding colors):

> barplot(1:10,col=rainbow(10))

How do I get a portion of the rainbow ribbon instead of going from red to the end position? It can be set based on the parameters start and end:

With rainbow, the parameters start and end can be used to specify particular subranges of hues. The following values can be used when generating such a subrange: red = 0, yellow = 1/6, green = 2/6, cyan = 3/6, blue = 4/6 and magenta = 5/6.

For example, color from red to blue:

> rainbow(10,start = 0,end=4/6) [1] "#FF0000FF" "#FF7100FF" "#FFE300FF" "#AAFF00FF" "#39FF00FF" "#00FF39FF" "#00FFAAFF" [8] "#00E3FFFF" "#0071FFFF" "#0000FFFF"> barplot(1:10,col=rainbow(10,start=0,end=4/6))

Start=1/6, end=5/6

> barplot(1:10,col=rainbow(10,start=1/6,end=5/6))"How to get color according to rainbow in R language" is introduced here. Thank you for reading. If you want to know more about industry-related knowledge, you can pay attention to the website. Xiaobian will output more high-quality practical articles for everyone!