Re: [R] Conditional coloring of area between curves
Hi Duncan, that's exactly what I was looking for! The series have common times, so that's no problem. Thanks a lot! Roland Von: Duncan Murdoch [murdoch.dun...@gmail.com] Gesendet: Donnerstag, 6. Juni 2013 18:45 An: Roland Pape Cc: r-help@r-project.org Betreff: Re: [R] Conditional coloring of area between curves On 06/06/2013 10:41 AM, Roland Pape wrote: Dear list, I have two time series of temperatures from different sites plotted in the same diagram and would like to color the area between the curves differently, dependent on whether site 1 is cooler than site 2 (colored let's say in blue) or warmer (red). While polygone() works fine to color the enclosed area in general, I'm struggling with this conditional coloring. Any help is greatly appreciated! Suppose the series are named site1 and site2, and they have common times in a variable times. Then the following should do what you want: smaller - pmin(site1, site2) plot(x, site1, ylim = range(c(site1, site2)), type=n) polygon(c(x, rev(x)), c(smaller, rev(site1)), col=red) polygon(c(x, rev(x)), c(smaller, rev(site2)), col=blue) If the times for the two series are different it's a little harder; first you need to give them common times, and that will depend on how you decide to evaluate the values between observations. Probably linear interpolation (using approx()) is fine, but it's up to you. Duncan Murdoch __ R-help@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.
Re: [R] Conditional coloring of area between curves
that's exactly what I was looking for!
That code has some problems if your time series do not cross at the time
points. E.g., Duncan's code with some diagnostic plotting is:
f0 - function (site1, site2, x = time(site1), check = FALSE)
{
stopifnot(length(x) == length(site1), length(x) == length(site2),
all(diff(x) 0))
if (check) {
oldMfrow - par(mfrow = c(2, 1))
on.exit(par(oldMfrow))
matplot(x, cbind(site1, site2), type = b)
}
smaller - pmin(site1, site2)
plot(x, site1, ylim = range(c(site1, site2)), type = n)
polygon(c(x, rev(x)), c(smaller, rev(site1)), col = red)
polygon(c(x, rev(x)), c(smaller, rev(site2)), col = blue)
}
# See how it messes the crossings in
f0(c(0, 1, -1, 0), c(1, 0, -2, 1), check=TRUE)
The following is a quick and dirty way of adding all the crossing
points to the original data sets so the plot is right.
addCrossingPoints - function (y1, y2, x)
{
stopifnot(length(y1)==length(x), length(y2)==length(x), all(diff(x)0))
# isCrossingSegment[i]==TRUE means that y1 and y2 cross between
#x[i] and x[i+1] (strictly, not at x[i] or x[i+1]).
i - seq_len(length(y1) - 1)
isCrossingSegment - ((y1[i] y2[i]) (y1[i+1] y2[i+1])) |
((y1[i] y2[i]) (y1[i+1] y2[i+1]))
if (any(isCrossingSegment)) {
i - which(isCrossingSegment)
dx - x[i+1] - x[i]
m1 - (y1[i+1] - y1[i]) / dx
m2 - (y2[i+1] - y2[i]) / dx
newDX - (y1[i] - y2[i]) / (m2 - m1)
newY - y1[i] + newDX * m1
o - order( x - c(x, x[i] + newDX))
x - x[o]
y1 - c(y1, newY)[o]
y2 - c(y2, newY)[o]
}
list(y1=y1, y2=y2, x=x)
}
# Combine it with Duncan's code to get a better looking plot
f1 - function(site1, site2, x=time(site1), check = FALSE) {
tmp - addCrossingPoints(site1, site2, x)
f0(tmp$y1, tmp$y2, tmp$x, check=check)
}
f1(c(0, 1, -1, 0), c(1, 0, -2, 1), check=TRUE)
Bill Dunlap
Spotfire, TIBCO Software
wdunlap tibco.com
-Original Message-
From: r-help-boun...@r-project.org [mailto:r-help-boun...@r-project.org] On
Behalf
Of Roland Pape
Sent: Friday, June 07, 2013 2:51 AM
To: Duncan Murdoch
Cc: r-help@r-project.org
Subject: Re: [R] Conditional coloring of area between curves
Hi Duncan,
that's exactly what I was looking for! The series have common times, so
that's no
problem. Thanks a lot!
Roland
Von: Duncan Murdoch [murdoch.dun...@gmail.com]
Gesendet: Donnerstag, 6. Juni 2013 18:45
An: Roland Pape
Cc: r-help@r-project.org
Betreff: Re: [R] Conditional coloring of area between curves
On 06/06/2013 10:41 AM, Roland Pape wrote:
Dear list,
I have two time series of temperatures from different sites plotted in the
same diagram
and would like to color the area between the curves differently, dependent on
whether
site 1 is cooler than site 2 (colored let's say in blue) or warmer (red).
While polygone()
works fine to color the enclosed area in general, I'm struggling with this
conditional
coloring. Any help is greatly appreciated!
Suppose the series are named site1 and site2, and they have common
times in a variable times. Then the following should do what you want:
smaller - pmin(site1, site2)
plot(x, site1, ylim = range(c(site1, site2)), type=n)
polygon(c(x, rev(x)), c(smaller, rev(site1)), col=red)
polygon(c(x, rev(x)), c(smaller, rev(site2)), col=blue)
If the times for the two series are different it's a little harder;
first you need to give them common times, and that will depend on how
you decide to evaluate the values between observations. Probably linear
interpolation (using approx()) is fine, but it's up to you.
Duncan Murdoch
__
R-help@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.
__
R-help@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.
[R] Conditional coloring of area between curves
Dear list, I have two time series of temperatures from different sites plotted in the same diagram and would like to color the area between the curves differently, dependent on whether site 1 is cooler than site 2 (colored let's say in blue) or warmer (red). While polygone() works fine to color the enclosed area in general, I'm struggling with this conditional coloring. Any help is greatly appreciated! Roland [[alternative HTML version deleted]] __ R-help@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.
Re: [R] Conditional coloring of area between curves
On 06/06/2013 10:41 AM, Roland Pape wrote: Dear list, I have two time series of temperatures from different sites plotted in the same diagram and would like to color the area between the curves differently, dependent on whether site 1 is cooler than site 2 (colored let's say in blue) or warmer (red). While polygone() works fine to color the enclosed area in general, I'm struggling with this conditional coloring. Any help is greatly appreciated! Suppose the series are named site1 and site2, and they have common times in a variable times. Then the following should do what you want: smaller - pmin(site1, site2) plot(x, site1, ylim = range(c(site1, site2)), type=n) polygon(c(x, rev(x)), c(smaller, rev(site1)), col=red) polygon(c(x, rev(x)), c(smaller, rev(site2)), col=blue) If the times for the two series are different it's a little harder; first you need to give them common times, and that will depend on how you decide to evaluate the values between observations. Probably linear interpolation (using approx()) is fine, but it's up to you. Duncan Murdoch __ R-help@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.
