Displaying 20 results from an estimated 6000 matches similar to: "Making color gradient"
2008 Apr 08
2
diagonally fill a rectangle with color gradient
Hi,
Is it possible to diagonally fill a rectangle with a color gradient? I
noticed that the gradient.rect of plotrix could fill a rect either up and
down or from side to side. I am looking for something similar but fills
diagonally instead, e.g., from the upper left corner to the bottom right.
Does anyone know how to do it in R?
Thanks,
--
Tom
[[alternative HTML version deleted]]
2006 Oct 06
3
is it possible to fill with a color or transparency gradient?
Hi all,
Is there a way to fill a rectangle or polygon with a color and/or
transparency gradient? This would be extremely useful for me in terms
of adding some additional information to some plots I'm making,
especially if I could define the gradient on my own by putting
functions into rgb something like rgb( r=f(x,y), g=f(x,y), b=f(x,y),
alpha=f(x,y) ). Not so important whether the
2006 Oct 14
1
patch to set start- and end-color-stop for the skydome fallback gradient
Greetings everybody!
I was asked by someone (from the beryl-forum) if/how one could alter
the values for the two color-stops used by the fallback-gradient of the
skydome (for the case the supplied image could not be found). Up to now
they were hardcoded, but with this patch they can be set via...
/apps/compiz/plugins/cube/screen0/options/skydome_gradient_start_color
2009 Jun 25
3
grid.polygon() + color gradient
Hi,
I wonder whether there is a way to generate a polygon (a triangle in
my case) with color gradient using grid.polygon() in package grid?
I tried something like
library(grid)
grid.polygon(x=c(0, 0.5, 1), y=c(0.5, 1, 0.5), gp=gpar(col=NA,
fill=colorRampPalette(c("green", "lightgray"),
space="Lab")(200)))
But am only
2008 Aug 14
1
Graphing: plot 3rd variable based on color gradient
Hello,
I am searching for the best method to plot two variables with points
whose output color depends on the size of a third variable. For
example, the darkness of the x-y point would increase incrementally
based on the size of the z value, similar to the colramp parameter in
geneplotter. This would be analagous to symbols(), except changing the
selection from the color gradient rather than the
2017 Oct 24
3
draw a circle with a gradient fill
Hi all,I would like to draw a simple circle where the color gradient follows the rule color = 1/(r^2) where r is the distance from the circle. I would also like to add a color bar with values going from -40 to -110 (and associate those with the color gradient that fills the circle).
So far I experiemented with draw circle
2009 Jun 24
1
parallel rotated strips with color gradient
Hi,
I want to produce two parallel rotated strips with color gradient. So
far, the sample strip is something produced by this:
pushViewport(viewport(x = unit(0.638, "npc"), y =unit(0.386, "npc"),
width=.62, height=0.006, angle=137.2))
grid.rect(y=100:1/100, just="top",
gp=gpar(col=NA,
fill=colorRampPalette(c("lightgray",
2010 Oct 02
2
too mach distortion on color gradient
Hallo all,
i ready send one emeil with screenshots but it seems to take some time
till it will be accepted, so i send one more time with links.
> Hallo all,
> there is sintel online premiere up today http://www.sintel.org/ . But
> oggtheora video is every thing but not gut. I downloaded 720p version
> but IMHO some times it looks for me like scaled 480p. In my
> experience theora
2010 Nov 21
1
"negative alpha" or custom gradient colors of data dots in scatterplot ?
I know that by setting alpha to for example col = rgb(0, 0, 0, 0.1) it is
possible to see how many overlapping is in the plot. But disadvantage of it
is that single points are barely visible on the background. So I wonder if
there is possible to make setting that single points would be almost black,
but with more and more data on the same spot it would get more and more
whiteish. Or maybe it is
2011 Feb 26
1
wireframe() display a graph with two colors, not a gradient.
Hi all,
I'm quite new to wireframe, essentially what I want to do is display a graph, and z-values > 1 would be yellow and those < 1 would be blue.
This is a bit of my data.
0.334643563 0.350913807 0.383652307
0.370325283 0.38779016 0.42387392
0.39861579 0.418389687 0.460692165
0.43888516 0.468015843 0.520560489
0.499544084 0.535099422 0.60982153
0.569888047 0.634351734
2009 Nov 05
1
Set colors in a PCA plot based on a gradient vector
Hi all,
I'm making a PCA plot with eight variables (columns taken from a larger data frame "fieldTrial0809[idx,c(39:46)]"). I then want the symbols in the plot to be colored as a gradient from red to blue, depending on the value of another column in "fieldTrial0809[idx, c(48)]" containg temperatures from -12.1 to -5.4.
I don't want to use the heat.colors(n)
2009 Feb 14
2
Dynamic Panel Analysis in R
Hi!
I am quite a new user of R. I wanted to ask if there was some package
for dynamic panel analysis (with Arneallo-Bond Method) like stata. PLM
is for panel analysis but not for dynamic.
Best regards,
Tanveer
2008 Sep 17
6
creating rainbow gradients
Hi, how can I create a rainbow gradient in R? For example, let's say I have
a plot of y = x...and I want the plot to go from red -> orange -> yellow ->
green -> blue -> etc.
Right now, I know how to do something like go from red to blue, using the
plotrix library:
library(plotrix)
redToBlue <-
2011 Jul 06
1
gradient generation
Dear R-help subscribers;
I have a question regarding making gradients in R. I've searched on the
web, but was only able to find functions that make a gradient between
color X and Y, which is not what I want.
I want to 'pick out' individual, smaller pieces of a gradient based on a
range of numbers. Say that I have a range of numbers, leading from 0 to
1. Then I want 0 to refer to
2011 Nov 30
1
How can I pick a matrix from a function? (Out Product of Gradient)
Hi all,
I would like to use optim() to estimate the equation by the log-likelihood
function and gradient function which I had written. I try to use OPG(Out
Product of Gradient) to calculate the Hessian matrix since sometime Hessian
matrix is difficult to calculate. Thus I want to pick the Gradient matrix
from the gradient function.
Moreover, could R show the process of calculation on gradient
2008 Apr 22
2
optimization and gradient
Dear all,
I am using the functions 'optim' and 'nlminb'. For both, you can provide
a function which computes the gradient of the objective function (to
enhance speed and precision). In my case, both the objective function
and the gradient take time to be computed and share many common
computations (similar matrix, products, etc...). Therefore, I have to
compute these
2003 Jan 17
1
supplying gradient to constrOptim()
Hi, I'm very interested in using the constrOptim() function currently in
the R-devel sources. In particular, I'm trying to fit point process
conditional intensity models via maximum likelihood. However, I noticed
that the gradient of the objective function must be supplied for all but
the Nelder-Mead method. I was wondering why this was because optim()
itself does not require a gradient
2003 Mar 27
1
How to obtain final gradient estimation from optim
I use optim to compute maximum likelihood estimations without giving an
analytical gradient to optim. However, I would like to
get an output of the final numerical gradient vector and the final matrix of
contributions to the gradient. But I did not
find any mention of this kind of output in help pages. Does anyone know how to
do that ?
Stephane Luchini
GREQAM
Marseille, France
2006 Sep 29
1
linear gradient in nls
Hello,
I hope this doesn't turn into a statistics question but here I
go. I am using the nls function with a Gaussian distribution, see coding
below. When I run the nls I get an error back saying that I have a linear
gradient. I then, of course am unable to do anything else. The data that I
am using are intensity values from some mass spectrometry data. Is there
something I can
2011 Aug 29
3
gradient function in OPTIMX
Dear R users
When I use OPTIM with BFGS, I've got a significant result without an error
message. However, when I use OPTIMX with BFGS( or spg), I've got the
following an error message.
----------------------------------------------------------------------------------------------------
> optimx(par=theta0, fn=obj.fy, gr=gr.fy, method="BFGS",
>