similar to: documenation for arrows() is backwards (PR#7839)

I suggest a simple enhancement to segments() and arrows() to facilitate drawing horizontal and vertical segments -- set default values for the second x and y arguments equal to the first set. This is handy, especially when the expressions for coordinates are long. Compare: Segments: < function (x0, y0, x1 = x0, y1 = y0, col = par("fg"), lty = par("lty"), --- > function

I was teaching new R users to make some fun graphs. I had some arrows examples worked up we came across a problem. The arrows function ignores 2nd and following elements of vectors given as code an angle. Would you please consider 1) allowing vectors for code and angle, or 2) returning an error or warning when user mistakenly supplies a vector for those parameters? When code like this is

Hi there, I produced a plot using the following codes: y<-rnorm(1000, 2, 0) x0<-c(0, 0) y0<-c(0, 0) y1<-c(0, 1) x1<-c(0, 4) plot(density(y), ylab="Abundance of species", xlab="Environmental gradient", main=" ", xlim=c(0, 4), ylim=c(0, 1), lty=2, col=4, xaxt="n", yaxt="n", frame.plot=F) lines(x0, y1) # add an axis

arrows() seems to hang when either x or y scale of the plot is logarithmic and the arrows requested go beyond the plot (by more than a certain amount). I didn't go into C code to find it, but here's a function that exercises the bug a bit ... arrow.bug2 <- function(y0=1,y1=10,log="y") { plot(c(0.1,1),c(1,10),log=log) arrows(x0=0.5, y0=y0, x1=0.5,

The result of > plot(c(-1,1),c(-1,1),type="n") > arrows(0,0,1,1) > arrows(0,0,0,0) is not what I expected. The first arrow is drawn correctly. The second does not collapse to a point but goes from (0,0) off to (-infinity,infinity). I guess something is divided by zero in the internal function. Chris. =============================================== platform Windows arch

I have started using the circular package but it is not recognizing the function arrows.circular. I attempted to use the example provided in the circular manual. Here is the example code using the circular package: plot(rvonmises(10, circular(0), kappa=1)) arrows.circular(rvonmises(10, circular(0), kappa=1)) arrows.circular(rvonmises(10, circular(0), kappa=1), y=runif(10), col=2)

I would like to have arrow heads at the end of my axes, since I am plotting variable where the absolute amount is irrelevant, there is not supposed to be numbers on the axes. An imperfect example: plot(rnorm(10),bty='l',xaxt='n',yaxt='n',ylab='',xlab='',type='l') abline(h=0) Like this but without, the xaxis and with arrrowheads More like this in

Dear List, I am writing a custom panel function and xyplot method to plot the results of a procrustes analysis from the vegan package. I am having trouble getting the call to panel.arrows to work as I wish when conditioning. The attached file contains the function definitions for the xyplot method and the custom panel and prepanel functions I am using. This example, using data and functions from

Full_Name: Michael Hoffman Version: 2.0.0-beta-20041001 OS: OSF1 V5.1 Submission from: (NULL) (193.62.199.8) Hello. Building R 2.0.0-beta-20041001 on OSF1 V5.1 failed because the default configure sets R_XTRA_CFLAGS to "-std1 -ieee_with_inexact." The bzip2 directory includes C99 code that requires -std1 to not be set in order to compile. This halts the overall build process.

There is a function called arrows() which is an .Internal function. How difficult is it to modify that function to return the xy coordinates for the line "segments" that make up the arrowhead? Brandon Chasco University of Washington ph (206) 221-6768

Hi all, I've been using the arrows() function in plots a lot, but I'm not happy with the appearance of the arrow heads. I understand that arrows () doesn't offer more sophisticated arrowhead shapes like e.g. a filled triangle, possibly with choice of angle at the point. Does anyone know an easy way to achieve this? thanks Hendrik

Hi. I've got a lattice plot with multiple panels and two groups superimposed on each panel. Each panel has an independently scaled y-axis (scales = list(relation = "free")). I've successfully put up 95%CI error bars using panel.arrows (and some help from the mailing list). My question is whether I can "unscale" the arrowheads so that they appear to have the same

Hi, I am using R on Windows XP. I am using 'arrows' funtion to plot the variance as error bar, BUT error bar goes only one side of the data point, I need to plot the error bar on both side of the data point (plot is attached), I am using following commands to plot, plot(file3$lat,file3$STotwoKm,pch=21,cex=2.5,ylim=c(-0.2,2.5),xlim=c(-50,50),xlab=NA,ylab=NA, col=1,

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Hi, I am trying to plot odds ratios and the corresponding confidence intervals in horizontal segments. It would be ideal if the confidence interval segment can be drawn with little vertical bars at both ends. I have tried very hard to change the type of ends by using 'lend' arguments, but cannot make it. I even tried 'arrows()', but still failed. Following is the code I use:

Hello dear members of R-help and R-core mailing list, I am not sure if this request is a "ticket" that should be filled somewhere outside the mailing list. If so, I apologize for not doing and would like to know where I should have filled it. And to the subject matter: I would like to use a command like this: plot(c(1,8), 1:2, type="n") polygon(1:7, c(2,1,2,NA,2,1,2),

Hello dear members of R-help and R-core mailing list, I am not sure if this request is a "ticket" that should be filled somewhere outside the mailing list. If so, I apologize for not doing and would like to know where I should have filled it. And to the subject matter: I would like to use a command like this: plot(c(1,8), 1:2, type="n") polygon(1:7, c(2,1,2,NA,2,1,2),

Uwe Ligges suggested I post this on R-bugs as a wishlist item with a proposed patch. R considers zero-length arguments to segments() to be an error. I would like R to allow this and to return without an error. It occurs naturally in settings like valid <- c(FALSE, FALSE, FALSE) segments(x0[valid], y0[valid], x1[valid], y1[valid]) For what it may be worth, S-Plus does not consider

Hi all, for example: > X<- rnorm(1000) > X0 <- 0.899 I want to draw a density distribution plot with a arrow pointer indicating the position of X0, meanwhile, giving out the p-value. any functions? Thanks very much.

Greetings: I would like comments on this example and after fixing it up, I need help from someone who has access to insert this in R's help page for plotmath. I uploaded a drawing http://pj.freefaculty.org/R/Normal-2009.pdf that is created by the following code http://pj.freefaculty.org/R/Normal1_2009_plotmathExample.R This will be a good addition to the plotmath help page/example.