Dear R community,
this is probably a well-known topic to some of you, but I am not well into it
and would like some clarifications or even jus some suggestions.
I have a quadratic scalar field:
F(x,y)=K*exp(-(a*x^2+b*y^2+c*x*y))
I also have a random set of positive x,y values and
Apologies in advance for the basic nature of my question.
I've never worked with time series, but I am, at present, dealing
with evolution in time of certain scalar quantities.
By looking at the plots, scalar quantity vs time, for several of these
quantities, I am observing a correlation of
Dear R community,
I am trying to understand how the ward linkage works from a quantitative point
of view.
To test it I have devised a simple 3-members set:
G = c(0,2,10)
The distances between all couples are:
d(0,2) = 2
d(0,10) = 10
d(2,10) = 8
The smallest
Dear R community,
I would like to source a file in my linux system to set a few environment
variables.
I have tried:
system(source /home/james/build//ccp4-6.1.13/include/ccp4.setup)
and got:
sh: source: not found
In fact, using Sys.which(source) I get an empty string.
How can I source that
Dear R community,
I can't find the way to eliminate the hclust() print at the bottom of the
dendrogram plot (plclust).
Can this be done?
J
Dr James Foadi PhD
Membrane Protein Laboratory (MPL)
Diamond Light Source Ltd
Diamond House
Harewell Science and Innovation Campus
Chilton, Didcot
Yes. A white cube and all lights off to start with give me what I want.
Many thanks!
J
Dr James Foadi PhD
Membrane Protein Laboratory (MPL)
Diamond Light Source Ltd
Diamond House
Harewell Science and Innovation Campus
Chilton, Didcot
Oxfordshire OX11 0DE
Email: james.fo...@diamond.ac.uk
Dear R community (and Duncan more specifically),
I can't work out how to make additional light sources work in rgl.
Here is the example.
First I create a cube and visualize it:
cubo - cube3d(col=black)
shade3d(cubo)
Next I position the viewpoint at theta=0 and phi=30:
view3d(theta=0,phi=30)
Dear RGL experts,
I haven't been able to add greek letters to my rgl plot3d.
I have tried expression with no success.
Here is the interested bit:
library(rgl)
cb - cube3d()
plot3d(cb,xlab=expression(alpha),ylab=,zlab=,box=FALSE,alpha=0.5)
The expression(alpha) appears as alpha, rather than
Dear R community,
I am puzzled by the following lines:
v - seq(-0.5,0.5,by=0.1)
v
[1] -0.5 -0.4 -0.3 -0.2 -0.1 0.0 0.1 0.2 0.3 0.4 0.5
which(v == -0.4)
[1] 2
which(v == 0)
[1] 6
which(v == 0.1)
integer(0)
which(v == 0.2)
integer(0)
which(v == 0.3)
integer(0)
which(v == 0.4)
Dear R community,
I'm trying to develop a fast way of summing specific rows of a large data frame.
Here is an example of the kind of data frames I'm dealing with:
refls
H K L M/ISYM BATCH I SIGI
43247 1 0 5 2179 61.44117 2.20553
1040 1 0 5257 6 15.16316
Dear R community,
I'm in the process of writing a package.
One of the functions reads a whole ascii file, full of data:
SYMINFO - scan(/file/full/of/data.txt,what=character,sep=\n,quiet=TRUE)
SYMINFO is now an array character with roughly 14000 elements.
I thought the best way to use this
Dear R community,
just in case some haven't noticed my previous email.
I realize hclust relies on a Fortran routine, but I hoped
some of you might exactly know how that Y.hc_c$height
is computed. And, thus, explain the anomaly I found.
Thank you.
J
Dr James Foadi PhD
Membrane Protein Laboratory
Dear R community,
I would be greatful if somebody could shed light on the following.
I have created a set of 6 points to check how centroid
agglomeration works in cluster analysis:
Y - data.frame(x=c(-1,1,1,-1,10,12),y=c(1,1,-1,-1,0,0))
It is quite intuitive to understand that the last
Dear R gurus and users,
I seem to have problem finding the right tool for plotting convex hulls over
2D plots, after a cluster analysis. In fact I would like to draw a convex hull
in 2D for a generic group of points. I found a convhulln, but this doesn't
seem
to give me a convex hull. Here is
-Original Message-
From: Henrique Dallazuanna [mailto:www...@gmail.com]
Sent: Tue 24/11/2009 16:10
To: Foadi, James (Imperial Coll.,RAL,DIA)
Cc: r-help@r-project.org
Subject: Re: [R] convex hull for cluster analysis
Try this:
plot(Y)
polygon(Y[chull(Y),])
Yes! Lovely!
Thanks.
J
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