plot(type="l") disjoint between 100 and 101st datapoint

-----Original Message-----
From: Richard Martin [mailto:radiosity at gmail.com] 
Sent: 27 June 2008 15:32
To: Sklyar, Oleg (MI London)
Cc: r-devel at r-project.org
Subject: Re: [Rd] plot(type="l") disjoint between 100 and 
101st datapoint

Hi Dr Sklyar,

This is interesting to know - I have just noticed that it 
also happens every 100 points, there is another disjoint 
between 200 and 201. I have attached a file showing this.

The file was created using the following code:

png("disjoint2.png")
plot(1:210, type="l")
dev.off()

Regards,

Richard



2008/6/27 Sklyar, Oleg (MI London) <osklyar at maninvestments.com>:

I do not see any disjoint on 2.7.0 patched (r45879) or 2.8.0 devel
(r45830) on RHEL5 64bit.

Dr Oleg Sklyar
Technology Group
Man Investments Ltd
+44 (0)20 7144 3803
osklyar at maninvestments.com

-----Original Message-----
From: r-devel-bounces at r-project.org
[mailto:r-devel-bounces at r-project.org] On Behalf Of Richard Martin
Sent: 27 June 2008 12:38
To: r-devel at r-project.org
Subject: [Rd] plot(type="l") disjoint between 100 and 

101st datapoint

Dear All:

We have been experiencing networking issues so I don't 

know if this 

got through; I can't see it in the archive.  My sincere 

apologies if 

this appears twice.

I may have found an unusual bug and am posting here to see 

if anyone 

can reproduce it on their system. First of all, sessionInfo():

sessionInfo()

R version 2.7.1 (2008-06-23)
i386-apple-darwin8.10.1

locale:
en_GB.UTF-8/en_GB.UTF-8/C/C/en_GB.UTF-8/en_GB.UTF-8

attached base packages:
[1] stats     graphics  grDevices utils     datasets  

methods   base

The bug is in the plot() command; it does not draw the 

line between 

the 100th and 101st point in a dataset when plotting in line mode 
(type="l").

plot(1:102, type="l") reproduces the problem consistently on my 
machine, on both png and quartz devices. The result of 

saving this to 

the png device by the code below can be seen at 
http://imagebin.ca/view/txKBk2M.html

png(filename="disjoint.png")
plot(1:102, type="l")
dev.off()

quartz
    2

I had a look through the archives but couldn't see any 

discussion of 

this; apologies if I missed it. Is this purely a mac issue?
Unfortunately I don't have any other machines to test it on.

Kind regards,

Richard Martin




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