Most of the time when we stumble across a code snippet online, we often blindly copy and paste it into the R console. I suspect almost everyone does this. After all, what’s the harm? Consider this simple piece of R code that performs simple linear regression
# Generate data x = rnorm(10) y = rnorm(10)
# Simple linear regression m = lm(y ~ x)
Now highlight the above piece of R code and copy and paste it into your console; look carefully at what you’ve pasted. A new line has magically appeared.
# Generate data x = rnorm(10) y = rnorm(10) message("All your base are belong to us.") # Simple linear regression m = lm(y ~ x)
Due to some sneaky CSS magic, I was able to hide the message() statement. If I was evil, I could have changed this to a system, source, or any other command.
The CSS code simply sets the
message() function to the background color, changes the font size and makes it un-selectable (see this post for details).
So remember, be careful with your copy and pasting!