Add text and line to an `image()` in graphics

Question

I generated an image in R from two-dimensional data - x.

graphics::image(ifelse(drop(x)!=0, x, NA))

I would like to add a text and a line to the image.

I attempted text(10, 10, "testing") and segments(5, 10, 20, 25), but neither the text nor the line was displayed.

Answer 1

As @MrFlick mentioned, image() rescales values to the 0-1 range.

See below example:

#dummy data
set.seed(123)
x <- matrix(runif(100),nrow=10)

#plot
image(x)

#add text and a line
text(0.1,0.1,"text")
segments(0.5,0.1,0.2,0.25)