The suggestions from others to use lattice's xyplot, or ggplot2 are good.
If you want an explicit loop you can do something like:
for ( nm in unique(mydat$Name) ) {
with( subset( mydf, Name==nm) ,
{
plot(Time, Value, title=nm)
readline('CR to continue ')
}
)
}
At 5:19 PM -0700 9/13/09, Chris Li wrote:
Hi all,
I am new to R and I have got a question in regards to factors.
Say I have a simple dataset like the following:
Name Time Value
a 1:00 1.25
a 2:00 1.26
b 1:00 1.29
b 2:00 1.28
c 1:00 1.21
c 1:30 1.20
c 2:00 1.23
I want to write a script that automatically plot value against time for a, b
and c. Because I have got more than 1 datasets, therefore the name of the
next dataset may consist d, e, h and g. So I will need a script that can
detect the changes in Name automatically.
Thank you very much for your time.
Chris
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