Displaying 20 results from an estimated 1000 matches similar to: "plotting a grid with color on a map"
2009 May 11
2
Plotting colors on a world map
Hi useR's
I have created a simple map of the world using the following code:
m <- map(xlim=c(-180,180), ylim=c(-90,90))
map.axes()
I then create a grid of dimension 36x72 using the code:
map.grid(m, nx=72, ny=36, labels=FALSE, col="black")
This gives 2592 grid cells. In a separate data set of dimension 36x72, I
have 2592 temperature values (some missing values are present)
2009 Oct 16
2
using a custom color sequence for image()
Hi, I'd like to use a custom color sequence (black - low values, green -
high values) in am image() plot. While I can specify colors (say a sequence
of grays) to the col argument, the ordering is getting messed up. I have two
questions:
1. How can I get a sequence of say 256 colors starting from black and ending
in green?
2. How is this specified to image() such that it uses the colors in
2007 Sep 10
5
finding the minimum positive value of some data
useRs,
I am looking to find the minimum positive value of some data I have.
Currently, I am able to find the minimum of data after I apply some other
functions to it:
> x
[1] 1 0 1 2 3 3 4 5 5 5 6 7 8 8 9 9 10 10
> sort(x)
[1] 0 1 1 2 3 3 4 5 5 5 6 7 8 8 9 9 10 10
> diff(sort(x))
[1] 1 0 1 1 0 1 1 0 0 1 1 1 0 1 0 1 0
> min(diff(sort(x)))
[1] 0
2007 Aug 31
2
memory.size help
I keep getting the 'memory.size' error message when I run a program I have
been writing. It always it cannot allocate a vector of a certain size. I
believe the error comes in the code fragement below where I have multiple
arrays that could be taking up space. Does anyone know a good way around
this?
w1 <- outer(xk$xk1, data[,x1], function(y,z) abs(z-y))
w2 <- outer(xk$xk2,
2008 Jul 29
3
finding a faster way to do an iterative computation
useR's,
I am trying trying to find out if there is a faster way to do a certain
computation. I have successfully used FOR loops and the apply function to
do this, but it can take some time to fully compute, but I was wondering if
anyone may know of a different function or way to do this:
> x
[1] 1 2 3 4 5
> xk
[1] 0.0 0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5 6.0
I want to do:
2011 Feb 07
1
color2d.maplot error
Dear all
I am using color2D.maplot to map some matrixes to plot. everything works fine. It seems that when my matrix contains only the same value color2D.maplot returns the following error:
color2D.matplot(estimatedsr,redrange=c(0,1),greenrange=c(0,.5),bluerange=c(0,.5),xlab="x",ylab="y",main=sprintf('Estimated'),show.legend=TRUE,show.values=TRUE)
Error in rgb(reds,
2008 Jul 24
2
simple random number generation
useR's,
I want to randomly generate 500 numbers from the standard normal
distribution, i.e. N(0,1), but I only want them to be generated in the range
-1.5 to 1.5. Does anyone have a simple way to do this?
Thanks,
dxc13
--
View this message in context: http://www.nabble.com/simple-random-number-generation-tp18642611p18642611.html
Sent from the R help mailing list archive at Nabble.com.
2008 Jan 16
3
color ranges on a 2D plot
useR's
I am trying to color the points on a scatter plot (code below) with two
colors. Red for values 0.5 -1.0 and blue for 0.0 - .49. Does anyone know a
easy way to do this?
x <- runif(100, 0, 1)
y <- runif(100, 0, 1)
plot(y ~ x, pch=16)
Thanks,
dxc13
--
View this message in context: http://www.nabble.com/color-ranges-on-a-2D-plot-tp14893457p14893457.html
Sent from the R help
2008 Jun 17
2
color2D.matplot axis names
Hi,
I finally came up with a nice colored matrixplot, using the color2D.matplot
function of the plotrix package. But I can't assign xtics and ytics to this
plot. I made sure that the matrix has correct colnames() and rownames().
Here's what I do:
a=matrix(1:16, 4, 4)
colnames(a) <- c("X1", "X2", "X3", X4)
rownames(a) <- c("Y1",
2009 May 24
2
Deleting columns from a matrix
useR's,
I have a matrix given by the code:
mat <-
matrix(c(rep(NA,10),1,2,3,4,5,6,7,8,9,10,10,9,8,NA,6,5,4,NA,2,1,rep(NA,10),1,2,3,4,NA,6,7,8,9,10),10,5)
This is a 10x5 matrix containing missing values. All columns except the
second contain missing values. I want to delete all columns that contain
ALL missing values, and in this case, it would be the first and fourth
columns. Any column
2009 May 04
2
A variation on the bar plot
Hi all,
I cannot think of the technical name of this plot, but I want to create a
plot with the data below that looks like two back-to-back horizontal bar
plots.
Ideally, there would be a vertical line in the center of the plot at zero,
and on the right hand side would be 4 bars representing the values for 2007,
and on the left side of the vertical line would be the corresponding values
for 2005.
2009 May 19
3
how to calculate means of matrix elements
useR's,
I have several matrices of size 4x4 that I want to calculate means of their
respective positions with. For example, consider I have 3 matrices given by
the code:
mat1 <- matrix(sample(1:20,16,replace=T),4,4)
mat2 <- matrix(sample(-5:15,16,replace=T),4,4)
mat3 <- matrix(sample(5:25,16,replace=T),4,4)
The result I want is one matrix of size 4x4 in which position [1,1] is the
2010 Mar 06
1
color2D.matplot not giving colors
I am using color2D.matplot to plot a matrix about 400 by 200.
The values in the matrix are 0:5 and NA. The resulting plot is not color, but shaded b/w. I tried to figure out how to add colors, I would like something like c(blue, green, red, cyan, green)
#example
motifx <- matrix(NA, nrow=100,ncol=20)
motifx[,1:5] <- 1
motifx[,6:10] <- 2
motifx[,11:15] <- 3
motifx[,15:19] <- 4
2010 Apr 23
2
3D Plot
Hi guys of the R-Help-Team!<br /><br />First of all - you do a great job!<br
/>I've found a lot of your mails in the internet. So I thought it would be a
good idea to ask you a question about R.<br /><br />R is new to me, so sorry,
if the question is too simple :)<br /><br />I have a matrix.<br />I can make a
2D Heatmap of this matrix.<br
2007 Sep 17
2
how to compare 2 numeric vectors
useR's
I am trying to compare two vectors that have the same length. More
specifically, I am interested in comparing the corresponding positions of
each element in the vector.
Consider these two vectors of length 20:
v1 <- 2 2 4 NA NA NA 10 NA NA NA NA NA NA NA NA NA NA
NA NA NA
v2 <- NA 4 NA NA NA NA 10 NA NA NA NA NA NA NA NA NA NA
NA
2010 Jun 09
2
Help needed on "switch" function
Hi all, Here I am trying to implement the switch() function to choose value of a variable depending on the value of an input variable :
temp1 <- "1"
temp1.name <- switch(temp1,
1 == "aa",
2 == "bb",
3 == "cc",
2009 Apr 30
2
gridding values in a data frame
Hi all,
I have a data frame that looks like such:
LATITUDE LONGITUDE TEMPERATURE TIME
36.73 -176.43 58.32 1
50.95 90.00 74.39 1
-30.42 5.45 23.26 1
15.81 -109.31 52.44 1
-80.75 -144.95 66.19 2
90.00 100.55 37.50 2
2013 Oct 25
1
add a color band
Hi all,
I would like to ask your help to add a color band (Ι am not sure regarding the right term, this color band at the right of the plot "describing" values with their corresponding color.
For now I have only this code
test<-matrix(data=runif(10000),nrow=100)
plot(test,axes="FALSE")
axis(1,at=c(0,1),labels=c("a","b")) #
but I would like to add
2011 Apr 03
3
Error in "color2D.matplot" : "Error in plot.new() : figure margins too large"
Hi,
I am using color2D.matplot (...) function of "plotrix" package. I used
a matrix of size around 20*20
However, apparently it failed to visualize the matrix and gave the
following exception, which I don't have any idea about possible source
of this error.
"Error in plot.new() : figure margins too large"
It would be appreciated if someone points me to the right origin
2007 Nov 06
1
color2D.matplot
I am a true R novice aonly using it for this function ;)
I am trying to use color2D.matplot to form a image of my data using the
following conditions
color2D.matplot(fi1, c(dr), c(dg), c(db), nslices=7, ylab='Species',
xlab="gene", show.legend=TRUE) where fi1 is my matrix.
I have a matrix with 36 columns and 130 rows. most entries are 1 or 0 and I
am trying to get this