changing front size and fading the colour, using R-base-CodePudding

I tried to smaller the font size of the x-axis in the barplot, using cex.lab. However, there are no changes, regardless of how I play with the numbers. Hence, I am wondering what has gone wrong in my code, as shown below.

car$Brand <- factor(car$Brand) %>% fct_infreq()

plot(carl$Brand, las=2, col= "dark blue", ylim=c(0,35), cex.lab=0.2)

Additionally, I would like to ask how to fade the color from dark color to light color (from dark blue to light blue) as the data value are getting smaller

Many thanks

CodePudding user response：

You must set both cex and cex.axis to change the axis labels sizes.
As for the colors, colorRampPalette returns an interpolating function between two limits.

set.seed(2022)
car <- data.frame(
  Brand = sample(LETTERS[10:1], 1e3, TRUE, prob = (1:10)/10)
)

car$Brand <- factor(car$Brand) |> forcats::fct_infreq()
ncolors <- length(unique(car$Brand))
fcolors <- colorRampPalette(c("dark blue", "light blue"))
fcolors(ncolors)
#>  [1] "#00008B" "#131895" "#26309F" "#3948A9" "#4C60B3" "#6078BD" "#7390C7"
#>  [8] "#86A7D1" "#99C0DB" "#ADD8E6"

plot(car$Brand, las=2,
     col= fcolors(ncolors),
     cex = 0.5, cex.axis = 1)

^{Created on 2023-01-02 with}