one way is the following: x <- seq(-2, 2, len = 11) y1 <- 2*x^2 + 3*x + 1 y2 <- - 2*x^2 - 3*x + 1
plot(x, y1, type = "l", col = "red", ylim = range(y1, y2)) lines(x, y2, col = "blue") I hope it helps. Best, Dimitris njhuang86 wrote:
Hi. Sorry if this question might have already been asked... I'm trying to plot two curves on the same X-Y coordinate. The par(mfrow) command allows me to plot the two curves on the same window however on different coordinate systems. Is there a way to force the two curves into the same coordinate system? Anyways, thanks in advance!
-- Dimitris Rizopoulos Assistant Professor Department of Biostatistics Erasmus University Medical Center Address: PO Box 2040, 3000 CA Rotterdam, the Netherlands Tel: +31/(0)10/7043478 Fax: +31/(0)10/7043014 ______________________________________________ R-help@r-project.org mailing list https://stat.ethz.ch/mailman/listinfo/r-help PLEASE do read the posting guide http://www.R-project.org/posting-guide.html and provide commented, minimal, self-contained, reproducible code.
