Displaying 20 results from an estimated 1000 matches similar to: "3-D ellipsoid equations"
2007 Apr 03
1
which points within an ellipsoid? Sorting data in 3d
Hello,
in a three dimensional coordinate system, I'd like to find all my
experimental data points that fall within an ellipsoid around a fixed
coordinate. The fixed point is defined by (x.coord.point,
y.coord.point, z.coord.point). The coordinates of the ellipsoid are
given by the three vectors x,y,z.
In a previous version of my code, I simply used a box instead of an
ellipsoid to sort
2009 Sep 06
1
Concentration ellipsoid
Hi all,
Can anyone please guide me how to draw a Concentration ellipsoid for a
bivariate system with a bivariate normal dist. having a VCV matrix :
Sigma <- matrix(c(1,2,2,5), 2, 2)
I would like to draw in using GGPLOT. Your help will be highly appreciated.
Thanks,
--
View this message in context: http://www.nabble.com/Concentration-ellipsoid-tp25315705p25315705.html
Sent from the R help
2012 Feb 07
2
3D confidence ellipsoid with ellipse projections onto 2D plane
I have a 3xN matrix of parameters obtained from N regressions where the 3
parameters are jointly statistically significant. I would like to reproduce
a 3D confidence ellipsoid projecting 2D ellipses onto the XY plane as in
Figure 5.2 in this
2002 Dec 05
1
How to plot a 3D ellipsoid in R?
Hey, all
I am going to plot several 3-dimensional ellipsoids
in R.
For example, A is such a ellipsoid with
mean u=[1 1 1]', covariance matrix C=[1 0 .5;0 1 .6;.5 .6 1];
So how can I plot such object in 3D space?
Is there some function to achieve this?
Thanks.
Fred
2002 Jan 04
1
[S] confidence ellipsoid for model parameters
John Fox wrote:
>The confidence ellipse for a pair of coefficients is just (with an
>adjustment for size) the perpendicular shadow of the joint ellipsoid, in
>the same sense that the confidence intervals for individual coefficients
>are shadows of the joint ellipsoid or ellipse. The usual confidence ellipse
>for 2 of q coefficients uses qf(.95, 2, df.error) to scale the ellipse; if
2012 Dec 31
2
code to convert 3D geographical coordinates to Cartesian?
Is there packaged code to convert geographical coordinates (e.g.,
longitude, latitude, elevation) to Cartesian coordinates in 3-space?
I can see how to do this using
1. a spherical-to-Cartesian conversion like pracma::sph2cart(tpr)
http://cran.r-project.org/web/packages/pracma/
2. a geographical-to-spherical conversion. This seems to involve (in
roughly increasing order of difficulty or
2006 Apr 26
1
Minimum Volume Ellipsoid Estimator ("cov.mve"??)
Dear All,
The Minimum Volume Ellipsoid estimator ("cov.mve") was part of S+ but I cannot find it in R. Where can I find it? Why was it excluded?
Cheers, Patrik
Sweden
2007 Feb 21
1
random uniform sample of points on an ellipsoid (e.g. WGS84)
I am interested in making a random sample from a uniform distribution
of points over the surface of the earth, using the WGS84 ellipsoid as
a model for the earth. I know how to do this for a sphere, but would
like to do better. I can supply random numbers, want latitude
longitude pairs out.
Can anyone point me at a solution? Thanks very much.
--
Russell Senior ``I have nine fingers;
2002 Jan 01
3
confidence ellipsoid for model parameters
Dear all,
Has anyone written functions to compute (and ideally project / plot onto
a plane) confidence ellipsoids for q linear model parameters, q > 2 ?
Greetings and best wishes,
Renaud
--
Dr Renaud Lancelot, v?t?rinaire
CIRAD, D?partement Elevage et M?decine V?t?rinaire (CIRAD-Emvt)
Programme Productions Animales
http://www.cirad.fr/presentation/programmes/prod-ani.shtml
ISRA-LNERV
2012 Feb 16
1
Is there a function for scatter3d with Categorical responses?
Hello,
I'm working with a series (30+) of hydrologic metrics and 10 vegetation
communities and I need to determine which of the metrics provide the best
separability for each of the vegetation communities. The hydrologic
metrics are highly correlated, therefore the need to reduce the number of
them considered is critically important.
I've been looking at the scatter3d function in the
2011 Jan 31
1
rgl: draw multiple ellipsoids
Dear list,
I'm trying to visualise some ellipsoidal shapes in 3D. Their position,
axes, and angular orientation can be arbitrary. I saw an ellipse3d
function in rgl; however it is heavily oriented towards the
statistical concept of ellipse of confidence, whilst I am just
concerned with the geometrical object.
Below is my current implementation. It is quite slow when creating
many shapes, so
2005 Jun 28
1
3D ellipsoid confidence region
I am curious if there is code developed to plot confidence regions in 3D.
The scatterplot3d function generates the plot I want, but would like an 3D
equivalent to the data.ellipse function.
Any help in this direction would be appreciated, be it theoretical,
graphical, or otherwise.
Melanie Edwards
Senior Statistician
Exponent
15375 SE 30th PL, Suite 250
Bellevue, WA 98007
Tel: (425) 519-8714
2006 Feb 02
3
is there a way to visualize 3D normal distributions?
Hi all,
How do I visualize a contour of a tri-variate normal distribution?
I just like to see the ellipsoid very much. I hope there is a easy way or
existing method in R.
Thank you a lot!
Michael.
[[alternative HTML version deleted]]
2012 Mar 09
2
rgl: cylinder3d() with elliptical cross-section
For a paper dealing with generalized ellipsoids, I want to illustrate in
3D an ellipsoid that is unbounded
in one dimension, having the shape of an infinite cylinder along, say,
z, but whose cross-section in (x,y)
is an ellipse, say, given by the 2x2 matrix cov(x,y).
I've looked at rgl:::cylinder3d, but don't see any way to make it
accomplish this. Does anyone have
any ideas?
thx,
2008 Dec 18
1
Ploting 3D cylinder in RGL
Dear all,
I would like to draw a 3-D horizontal cylinder preferably in RGL device
(because this gives the look from different angles). Basic idea is from
http://www.tau.ac.il/cc/pages/docs/sas8/insight/chap18/sect3.htm.
Below is the description exactly what I want to do.
Please see at figure 18.6, 1st plot. Here it is an confidence ellipsoid.
Suppose now you put another 4 same ellipsoids on top
2003 Sep 29
2
parametric surfaces
Hi,
does anyone know how to plot 3D parametric surface,e.g ellipsoid:
x=a*cos(s)*cos(t),
y=b*sin(s)*cos(t),
z=sin(t);
s in [0,2*pi],
t in [-pi,pi].
Vytautas Maniusis,
Vilnius University, Lithuania
2008 Oct 26
0
orthographic projection of ellipsoids
Dear list,
I've generated a list of 3D coordinates representing ellipsoids in
arbitrary orientations. I'm now trying to obtain a 2D projection of
the scene, that is to draw the silhouette of each object on a plane
(x,y). The only way I could think of is to compute the convex hull of
the (x,y) coordinates of each object and use this as the outline of
the object. This is clearly
2012 Feb 07
2
units for mapproject() function result
Does anyone know what the units are for projected coordinates obtained
using mapproj's mapproject function with an Albers projection? Thanks for
any and all help!
Buck Stockhausen
***************************************************
* Dr. William T. Stockhausen *
***************************************************
* Resource Ecology and Fisheries Management *
*
2009 Oct 12
0
need help
Sample Size
λ=5 α =
4 β = 3
Min.
1St Qu.
Median
Mean
3rd Qu.
Max.
100
0.000000
1.740638
4.040032
4.433828
5.607589
22.450405
500
0.000000
2.212375
3.915889
4.750014
6.356894
22.860806
1000
2016 Apr 09
0
kinit succeeded but ads_sasl_spnego_krb5_bind failed
I am try to setup a Samba4 Domain member to Samba4 AC DC
here is the smb.cfg
# Global parameters
[global]
netbios name = SOLAD
workgroup = SOLAE
realm = SOLAE.LOCAL
security = ADS
server role = member server
idmap config SOLAE : backend = rid
# idmap config SOLAE :schema_mode = rfc2307
idmap config SOLAE : range = 10000-9999999
idmap config * : backend = tdb
idmap config * : range =