plotrix

I'm using plotrix package to draw circles. And I don't get what is wrong with my code... :-( I have three points. The first point (1,1) should be the center of the circle. The following two points (1,4) and (4,1) have the same distance/radius to the center. So the circle in the plot should go through these points, right? And I don't know why the circle looks wrong. Is there an explanation? p1 <- c(1,1) p2 <- c(4,1) p3 <- c(1,4) r <- sqrt(sum((p1-p2)^2)) plot(x=c(p1[1], p2[1], p3[1]), y=c(p1[2], p2[2], p3[2]), ylim=c(-5,5), xlim=c(-5,5)) draw.circle(x=p1[1], y=p1[2], radius=(r)) abline(v=-5:5,

I can use ggplot2 easily to draw a graph like below: In fact, for my data, it is like below: degree value 1 120 0.50 2 30 0.20 3 -120 0.20 4 60 0.50 5 150 0.40 6 -90 0.14 7 -60 0.50 8 0 0.60 The first column is the degree (from -180 to 180 or from 0 to 360), the second column is the corresponding values. So I want to draw a graph point from (0,0) to each my data point with arrow but with a circular coordinate as below: 2 http://www.matrixlab-examples.com/image-files/polar_plots_1.gif I try to use follow code: base <- ggplot(polar, aes(x=degree, y=value)) p <- base + coord_polar() p <- p + geom

I'm not sure exactly what to call this, but I'm trying to achieve a sort of "broken histogram" or "axis gap" effect: http://gnuplot-tricks.blogspot.com/2009/11/broken-histograms.html (example is in gnuplot) with R. It looks like I should be using the gap.plot() function from the plotrix package, but I've only seen examples of doing that with scatter and line plots. I've been able to add a break in the box around my plot and put a zigzag in there, but I can't figure out how to rescale my axes to zoom in on the part below the break. The whole point is to be able to show the top value for one

I want to get a broken X-axis in my plot. In the x-axis I like to insert a broken-axis symbol < // > [starting from 2 and ended in end 8 which means 2-8 will be hidden in < // > symbol] so the other values can be emphasized. In Matlab, this task is performed by using BreakXAxis . In R, plotrix library helps only to plugin a break-axis symbol, that's all. x <- c(9.45, 8.78, 0.93, 0.47, 0.24, 0.12) y <- c(10.72, 10.56, 10.35, 10.10, 9.13, 6.72) z <- c(7.578, 7.456, 6.956, 6.712, 4.832, 3.345) plot(x, y, col='blue', pch=16, xlab= 'x', ylab='y, z') points(x, z, col='red', pch=17) library(plotrix)