Re: [R] How to color certain area under curve
I did similar things with polygon(). Le mar. 10 mars à 13:30, g...@ucalgary.ca a écrit : For a given random variable rv, for instance, rv = rnorm(1000), I plot its density curve and calculate some quantiles: plot(density(rv)) P10P50P90 = = quantile(rv,probs = c(10,50,90)/100) I would like to color the area between P10 and P90 and under the curve and mark the P50 on the curve. rv = rnorm(1000) plot(density(rv)) P10P50P90 = = quantile(rv,probs = c(10,50,90)/100) Could you please teach me how to do these using R? Thanks, -james __ 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. __ 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.
[R] How to color certain area under curve
For a given random variable rv, for instance, rv = rnorm(1000), I plot its density curve and calculate some quantiles: plot(density(rv)) P10P50P90 = = quantile(rv,probs = c(10,50,90)/100) I would like to color the area between P10 and P90 and under the curve and mark the P50 on the curve. rv = rnorm(1000) plot(density(rv)) P10P50P90 = = quantile(rv,probs = c(10,50,90)/100) Could you please teach me how to do these using R? Thanks, -james __ 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.
Re: [R] How to color certain area under curve
guox at ucalgary.ca writes: For a given random variable rv, for instance, rv = rnorm(1000), I plot its density curve and calculate some quantiles: plot(density(rv)) P10P50P90 = = quantile(rv,probs = c(10,50,90)/100) I would like to color the area between P10 and P90 and under the curve and mark the P50 on the curve. rv = rnorm(1000) plot(density(rv)) P10P50P90 = = quantile(rv,probs = c(10,50,90)/100) Could you please teach me how to do these using R? Thanks, -james see ?polygon Here after is an example of the use of polygon to solve your problem: rv - rnorm(1000) drv - density(rv) plot(drv) # further steps: # 1. compute quantiles # 2. determine the x and y of the area that must be drawn # 3. drawn # 4. add q.5 info qrv - quantile(rv, prob=c(0.1, 0.9)) select - qrv[1] = drv$x drv$x = qrv[2] polygon(x = c(qrv[1], drv$x[select], qrv[2]), y = c(0, drv$y[select], 0, col='blue') abline(v= quantile(rv, p=0.5), lty=2) Hope this will help. Matthieu __ 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.
Re: [R] How to color certain area under curve
Just a small typo. I forgot a ) in the polygon function. The code must be: polygon(x = c(qrv[1], drv$x[select], qrv[2]), y = c(0, drv$y[select], 0), col='blue') __ 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.
