"Masked by GlobalEnv"

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hello everyone,
i am getting problems in graph plotting. When i attach file after adding
color attributes in my data set. i got problem of "GlobalEnv"  and masked
the followings. Like this

attach(machm)
The following object(s) are masked _by_ '.GlobalEnv':

     coll, sp
The following object(s) are masked from 'mach':

     angle, area, dis, plot, sp
xmach=dis*sin(angle/180*pi); ymach=dis*cos(angle/180*pi)
plot(xmach,ymach, xlim=c(-5,5),ylim=c(-5,5), pch=19, cex=
machm$area*0.05,col=machm$coll)
Please read the posting guide that suggests how to ask questions in a 
way that we can answer. Your code is not reproducible for us, we do not 
have the data nor do we know whjat you actually expect.

Uwe Ligges
Graph did not take right R color code.
How can i solve this problem?,  As i am the newest user of R programme.

with regards,
ashok

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______________________________________________
R-help at r-project.org mailing list
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PLEASE do read the posting guide http://www.R-project.org/posting-guide.html
and provide commented, minimal, self-contained, reproducible code.

Graph did not take right R color code.
How can i solve this problem?,  
One generally useful piece of advice would be to avoid using 'attach'.
Instead, try 'with'
Amend your data frame, and then do something like

with(machm, plot(xmach,ymach, xlim=c(-5,5),ylim=c(-5,5), pch=19, cex=area*0.05,col=coll))

That will make sure that the items mentioned in the plot() call are taken from the data frame that you have just amended.

In your original code, you attached the data frame, making a copy of its contents available to the global environment, then you modified the attached version of the data, and then told the plot() command to use the original (unamended) data in the data frame. 
That is an easy mistake to make when using 'attach', and a good example of why it's better to use 'with' instead of being unsure which copy of the data is in use.
-----Original Message-----
From: r-help-bounces at r-project.org 
[mailto:r-help-bounces at r-project.org] On Behalf Of Ashok Parmar
Sent: 12 August 2012 03:54
To: r-help at r-project.org
Subject: [R] "Masked by GlobalEnv"

hello everyone,
i am getting problems in graph plotting. When i attach file 
after adding color attributes in my data set. i got problem 
of "GlobalEnv"  and masked the followings. Like this

attach(machm)
The following object(s) are masked _by_ '.GlobalEnv':

    coll, sp
The following object(s) are masked from 'mach':

    angle, area, dis, plot, sp
xmach=dis*sin(angle/180*pi); ymach=dis*cos(angle/180*pi) 
plot(xmach,ymach, xlim=c(-5,5),ylim=c(-5,5), pch=19, cex=
machm$area*0.05,col=machm$coll)

Graph did not take right R color code.
How can i solve this problem?,  As i am the newest user of R 
programme.

with regards,
ashok

	[[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.

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