On Nov 21, 2011, at 2:17 PM, SarahH wrote:
Dear All,
I am very new to R - trying to teach myself it for some MSc
coursework.
I am plotting temperature data for two different sites over the same
time
period which I have downloaded from a university weather station data
archive.
I am using the following code to create the plot
plot ( x = TEMP3[,"TIME"], y = TEMP3[,"TEMP"], type = "p", col =
TEMP3[,"SITE"], pch = 3, main = "Temperature changes", xlab =
"Date", ylab =
"Temberature[C]")
I managed to use col = TEMP3["SITE"] to plot the two different
sites( BG1
and EA7) in different colours, but I am struggling to change the
colours.
I wanted to up a colour scheme to match the site, so tried
Instead try
num.site <- as.numeric(TEMP3[,"SITE"])
plot ( x = TEMP3[,"TIME"], y = TEMP3[,"TEMP"], type = "p", col =
num.site, pch = 3, main = "Temperature changes", xlab = "Date", ylab =
"Temberature[C]")
Would create a vector of integer values that are specific to the sites
and then offere that as argument to col=
BG1 <- "blue"
EA7 <- "green"
That would only have created two new objects by that name (unless of
course you were following someone's misguided directions to use
attach().)
before the plot function, but the graphic just came out with red and
black
as before.
There are other datasets in which there are more than two sites so I
would
really like to learn how to use colour to distinguish between them
on a
plot.
Any direction would be very greatly received!
Thank you very much
Sarah
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