On 2016-02-06 19:23, David Winsemius wrote:

On Feb 6, 2016, at 4:11 AM, jupiter <jupiter....@gmail.com> wrote:

Hi,

I am just starting to learn R, sorry for asking a simple question. How can
plot a line x <= 0 y = 0, x > 0 y = 1?

There is a stepfun function and an associated plotting method:

  y0 <- c(rep(0,3),rep(1,3))
  sfun0  <- stepfun(-2:2, y0, right=TRUE)
  plot(sfun0)

I would like to suggest the correct way:

Replace the last line by

> plot(sfun0, verticals = FALSE)

Göran Broström

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