Question

How to change font size of text and axes on R plots

Answer 1

To change the font size of text, use cex (character expansion ratio).
The default value is 1.
To reduce the text size, use a cex value of less than 1; to increase the text size, use a cex value greater than 1.

> x <- seq(0.5, 1.5, 0.25)
> y <- rep(1, length(x))
> plot(x, y, main="Effect of cex on text size")
> text(x, y+0.1, labels=x, cex=x)

Become a proficient Data Analyst with our comprehensive Data Analyst Course.

Answer 2

1. Open the Settings app again and tap "Accessibility."
2. Tap "Display Size."
3. You'll be shown another slider. Slide it to the right to zoom in more, and make icons and text larger.

Answer 3

Go to the menu in RStudio and click on Tools and then Global Options. Select the Appearance tab on the left. Again buried in the middle of things is the font size. Change this to 14 or 16 to start with and see what it looks like.

Answer 4

To change the font size of text elements, use cex (short for character expansion ratio). The default value is 1. To reduce the text size, use a cex value of less than 1; to increase the text size, use a cex value greater than 1.

> x <- seq(0.5, 1.5, 0.25)
> y <- rep(1, length(x))
> plot(x, y, main="Effect of cex on text size")
> text(x, y+0.1, labels=x, cex=x)

To change the size of other plot parameters, use the following:

• cex.main: Size of main title

• cex.lab: Size of axis labels (the text describing the axis)

• cex.axis: Size of axis text (the values that indicate the axis tick labels)

> plot(x, y, main="Effect of cex.main, cex.lab and cex.axis",
+  cex.main=1.25, cex.lab=1.5, cex.axis=0.75)