On Nov 21, 2011, at 10:18 PM, R. Michael Weylandt wrote:
I don't think you can do different colors for a single line (not an
ifelse thing, just a what would that mean sort of thing), but a plot
type like "b" "o" or "h" will work the same way.
I think Jim Lemon has a multicolored line function in package:plotrix.
--
David.
Michael
On Mon, Nov 21, 2011 at 4:23 PM, SarahH <sarah....@hotmail.co.uk>
wrote:
I got the colour vector with ifelse to work, great! Thank you.
Is it possible to use the ifelse colour vector with other plot
types? For
example with type=l ? I tried but the graphic came back with blue
lines for
both sites and also a straight line connecting the start and end
point of
the data?
Thanks
Sarah
Michael Weylandt wrote
I think the easiest way to do this is to set up a color vector with
ifelse and hand that off to the plot command: something like
col = ifelse(TEMP3[,"SITE"] == "BG1", "blue", "green") # Syntax is
ifelse(TEST, OUT_IF_TRUE, OUT_IF_FALSE)
For more complicated schemes, a set of nested ifelse()'s can get you
what you need. There are some other tricks with factors as well, but
they require a little more advanced use of R. Just for the record,
they'd look something like this:
X = letters[c(1,2,3,3,1,2,1,3,3,1,2,2,1)]
colX = c("red","green","blue")[as.factor(X)]
Hope this helps,
Michael
On Mon, Nov 21, 2011 at 2:17 PM, SarahH <sarah.g10@.co> 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
BG1 <- "blue"
EA7 <- "green"
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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______________________________________________
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______________________________________________
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David Winsemius, MD
West Hartford, CT
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