[R] Odd gridding pattern when plotting

[Uwe Ligges]

I think you found a bug introduced in R-2.13.x that has been fixed in 
R-2.13.2 which has been released yesterday.

Best,
Uwe Ligges


On 30.09.2011 21:36, Balko, Justin wrote:
> Thanks, that kind of helps.  However, some of my previous code uses functions like heatmap.2 which has multiple images (legend/color key) as well as the actual heatmap.  Employing useRaster=TRUE here only applies to the heatmap and not the legend.  Not a huge deal.  Is there anyway to set an option in R to always use rastering when drawing in the interface?
> Thanks again,
> Justin
>
> -----Original Message-----
> From: David L Carlson [mailto:dcarlson at tamu.edu]
> Sent: Friday, September 30, 2011 1:54 PM
> To: Balko, Justin; r-help at r-project.org
> Subject: RE: [R] Odd gridding pattern when plotting
>
>> From ?image
>
> " Images for large z on a regular grid are more efficient with useRaster enabled and can prevent rare anti-aliasing artifacts, but may not be supported by all graphics devices."
>
> Adding useRaster=TRUE to the two image() calls gets rid of the white grid lines.
>
> -----Original Message-----
> From: r-help-bounces at r-project.org [mailto:r-help-bounces at r-project.org] On Behalf Of Balko, Justin
> Sent: Friday, September 30, 2011 10:43 AM
> To: r-help at r-project.org
> Subject: [R] Odd gridding pattern when plotting
>
>
> Hi, I'm no longer on the subscribing list, but was hoping to get my question posted.  Please inform if this is ok, although I am guessing you wont post with the image below.  If so, let me know and I will resend without the image.
> Thanks
>
>
> Hi,
> I just upgraded my system and my version of R all at once.  Upon running old code for heatmaps etc, I suddenly notice that there is an odd grid pattern appearing in all of my plots.  An example is below:
>
> #example from ?image
>
> require(grDevices) # for colours
> x<- y<- seq(-4*pi, 4*pi, len=27)
> r<- sqrt(outer(x^2, y^2, "+"))
> image(z = z<- cos(r^2)*exp(-r/6), col=gray((0:32)/32)) image(z, axes = FALSE, main = "Math can be beautiful ...",
>        xlab = expression(cos(r^2) * e^{-r/6})) contour(z, add = TRUE, drawlabels = FALSE)
>
>
>
> Any ideas what is causing this?  I can't seem to figure it out.  I'm not sure the bmp image can/will be posted, so maybe you can just take my word for it.  It is a gridding pattern in white, that appears over the plot area only.  Vertical lines are every 4 units, evenly spaced.  Horizontal lines appear at every unit, then stop for a while (6-7 units, then appear every unit for 4-5 units).  Simple plots like plot(x,y) do not seem to produce it, or at least I can't see it.  Any ideas are helpful.
> Thanks!
>
>
> Justin M. Balko, Pharm.D., Ph.D.
> Research Fellow, Arteaga Lab
> Department of Medicine
> Division of Hematology/Oncology
> Vanderbilt University
> 777 Preston Research Building
> Nashville TN, 37232-6307
> Ph: 615-936-1495
>
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