[R] problem with symbol function

Wed Apr 29 10:10:32 CEST 2009

Based on your solution, could we not fix this issue for the symbol  
function?

Le 27 avr. 09 à 23:47, Duncan Murdoch a écrit :

> On 27/04/2009 5:23 PM, Christophe Dutang wrote:
>> so it could be a limitation of graphics on windows?
>
> It's not graphics on Windows, but it appears to be a limitation of  
> the windows() graphics device in R.  It is used for bitmap plots as  
> well as on-screen plots, which is why you saw the same effect in  
> jpeg, but different devices are used for Postscript and PDF.
>
> When drawing lines, R handles the dash style itself, rather than  
> using the built-in dashes.  But it doesn't do so for circles, and  
> doesn't make use of the Windows line styles.
>
> If you really need the dashes onscreen, you can draw the circle  
> yourself.  Assuming the scales are equal on both axes that's easy,  
> just use
>
> > theta <- seq(0,2*pi, len=256)
> > lines(x+r*cos(theta), y+r*sin(theta), lty="dashed")
>
> (where (x,y) is the center and r is the radius).  It's more work if  
> you want things to appear as circles when the scales are unequal,  
> but I think this works:
>
> circle <- function(x, y, inches=1, ...) {
>  theta <- seq(0, 2*pi, len=256)
>  lines(x + grconvertX(inches*cos(theta), "inches", "user") -  
> grconvertX(0, "inches", "user"),
>        y + grconvertY(inches*sin(theta), "inches", "user") -
> grconvertY(0, "inches", "user"),
>        ...)
> }
>
> so you'd get the plot you wanted using
>
> circle(0, 0, inches = 1.5, fg="black",lty="dashed")
>
> The circle function is not vectorized, so it's not as useful as  
> symbols, but it could be improved.
>
> Duncan Murdoch
>
>
>> It also appears with "long dash" lines.
>> x <- -4:4
>> y <- -4:4
>> plot(x,y,type="n")
>> symbols(0, 0, add = TRUE, circles = 1, inches = 1, fg="black",   
>> lty="solid")
>> symbols(0, 0, add = TRUE, circles = 1, inches = 2,   
>> fg="black",lty="dashed")
>> symbols(0, 0, add = TRUE, circles = 1, inches = 3,   
>> fg="black",lty="longdash", lwd=2)
>> Le 27 avr. 09 à 23:07, Joshua Wiley a écrit :
>>> I read that the lty=2 argument does not work on all graphics   
>>> devices. You might double check that since it works on mac.
>>>
>>>
>>> Joshua Wiley
>>>
>>>
>>>
>>> ---- Original message ----
>>>> Date: Mon, 27 Apr 2009 22:58:11 +0200
>>>> From: Christophe Dutang <dutangc at gmail.com>
>>>> Subject: Re: [R] problem with symbol function
>>>> To: Joshua Wiley <jwile004 at ucr.edu>
>>>> Cc: r-help at r-project.org
>>>>
>>>> This point is ok if I download R from the Austrian mirror. R is
>>>> properly install on both computers. I also get this strange  
>>>> behavior
>>>> with R 2.7.2. There is something I'm missing...
>>>>
>>>>
>>>> Le 27 avr. 09 à 22:54, Joshua Wiley a écrit :
>>>>
>>>>> I am running SP3. You said earlier that you were having trouble
>>>>> downloading 2.9.0, are you sure everything downloaded and  
>>>>> installed
>>>>> properly? There have been some questions about transitioning to  
>>>>> the
>>>>> new build going around.
>>>>>
>>>>> Joshua Wiley
>>>>>
>>>>>
>>>>>
>>>>> ---- Original message ----
>>>>>> Date: Mon, 27 Apr 2009 22:45:26 +0200
>>>>>> From: Christophe Dutang <dutangc at gmail.com>
>>>>>> Subject: Re: [R] problem with symbol function
>>>>>> To: Joshua Wiley <jwile004 at ucr.edu>
>>>>>> Cc: r-help at r-project.org
>>>>>>
>>>>>> what is your service pack version?
>>>>>>
>>>>>> at home I use the SP2 version.
>>>>>>
>>>>>> Le 27 avr. 09 à 22:29, Joshua Wiley a écrit :
>>>>>>
>>>>>>> Hi Christophe,
>>>>>>>
>>>>>>> I am able to plot dashed circles on Windows. I'm afraid I do not
>>>>>>> have any suggestions for you. What happens when you try to  
>>>>>>> plot it
>>>>>>> on Windows?
>>>>>>>
>>>>>>>
>>>>>>> Joshua Wiley
>>>>>>>
>>>>>>>
>>>>>>> ---- Original message ----
>>>>>>>> Date: Mon, 27 Apr 2009 22:15:53 +0200
>>>>>>>> From: r-help-bounces at r-project.org (on behalf of Christophe
>>>>>>>> Dutang <dutangc at gmail.com
>>>>>>>>> )
>>>>>>>> Subject: [R] problem with symbol function
>>>>>>>> To: r-help at r-project.org
>>>>>>>>
>>>>>>>> Hi all,
>>>>>>>>
>>>>>>>> I use the symbol functions to draw circles. But the argument  
>>>>>>>> lty
>>>>>>>> does
>>>>>>>> not work on windows but works correctly on my macbook:
>>>>>>>>
>>>>>>>> x <- -4:4
>>>>>>>> y <- -4:4
>>>>>>>>
>>>>>>>> plot(x,y,type="n")
>>>>>>>>
>>>>>>>> symbols(0, 0, add = TRUE, circles = 1, inches = 1, fg="black",
>>>>>>>> lty="solid")
>>>>>>>>
>>>>>>>> symbols(0, 0, add = TRUE, circles = 1, inches = 2, fg="black",
>>>>>>>> lty="dashed")
>>>>>>>>
>>>>>>>>
>>>>>>>> The second circle should be drawn with dash... it works on my
>>>>>>>> macbook
>>>>>>>> but on my PC.
>>>>>>>>
>>>>>>>> I use R 2.9.0 on windows xp home and mac os 10.5.
>>>>>>>>
>>>>>>>> Does anyone have this problem? is it a limitation of windows?
>>>>>>>>
>>>>>>>> thanks in advance
>>>>>>>>
>>>>>>>>
>>>>>>>> Christophe
>>>>>>>>
>>>>>>>> --
>>>>>>>> Christophe Dutang
>>>>>>>> Ph. D. student at ISFA, Lyon, France
>>>>>>>> website: http://dutangc.free.fr
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>>
>>>>>>>> 	[[alternative HTML version deleted]]
>>>>>>>>
>>>>>>>> ______________________________________________
>>>>>>>> R-help at 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.
>>>>>> --
>>>>>> Christophe Dutang
>>>>>> Ph. D. student at ISFA, Lyon, France
>>>>>> website: http://dutangc.free.fr
>>>>>>
>>>>>>
>>>>>>
>>>>>>
>>>> --
>>>> Christophe Dutang
>>>> Ph. D. student at ISFA, Lyon, France
>>>> website: http://dutangc.free.fr
>>>>
>>>>
>>>>
>>>>
>> --
>> Christophe Dutang
>> Ph. D. student at ISFA, Lyon, France
>> website: http://dutangc.free.fr
>> 	[[alternative HTML version deleted]]
>> ------------------------------------------------------------------------
>> ______________________________________________
>> R-help at 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.
>

--
Christophe Dutang
Ph. D. student at ISFA, Lyon, France
website: http://dutangc.free.fr