**intersecting a hypercube and a hyperplane**Hi all,
I have a problem you will laugh about (maybe). Here:
You have a hypercube and a hyperplane. They intersect. In n-D the
intersection region is a (n-1)-D object. I am interested in
determining the vertices of the intersection object. Of course, I can
check all the edges and determine all intersection vertices, but that
takes n 2^(n-1) checks. Do you know of any algorithm to compute that?
The hyperplane is Sum(Xi)=C, for some C, where Xi is the i-th
coordinate.
Idea: For each vertex of the hypercube you add its coordinates, and
form a partition into three sets (ver...

**Intersect**Hello,
I want to kbnow if there is a means to do a query which can be like
this
select a,b from table 1 where conditions
intersect (a) (intersection only on column a)
select a,b from table 1 where other conditions
intersect(a)
select a,b from table 1 where another conditions
etc.
without a join (because i can have a lot of different conditions)
Thank you for your response
Ludovic wrote:
> Hello,
>
> I want to kbnow if there is a means to do a query which can be like
> this
>
> select a,b from table 1 where conditions
> intersect (a) (inters...

**intersect**is there any way to intersect / deintersect editable meshes ? (3dsmax 5)
.. Tried loking in the docs but couldn't find anything....
any help appreciated.
--
Eps
burchill wrote:
> is there any way to intersect / deintersect editable meshes ? (3dsmax 5)
> . Tried loking in the docs but couldn't find anything....
>
> any help appreciated.
>
> --
> Eps
nobody knows huh ?
what i have is a 2d spline that i have extruded long a 2d plane and I
need to make a whole in the middle of it, anyone know how ?.
--
Eps
Draw a circle and attach ...

**hyperspherical kmeans or hyperspherical fuzzy cmeans**are there any codes about that or m files ı look on the net but found nothing
"ali " <rebelfirst@gmail.com> wrote in message <h472l6$8qa$1@fred.mathworks.com>...
> are there any codes about that or m files ı look on the net but found nothing
Google returned me this results:
hyperspherical kmeans files:
http://s.pudn.com/upload_log_en.asp?e=533377
http://s.pudn.com/upload_log_en.asp?e=1207757
Tutorial on kmeans clustering matlab:
http://people.revoledu.com/kardi/tutorial/kMean/matlab_kMeans.htm
On pudn you have to upload something before you ...

**intersection**I'm a bit confused about how "intersection" is supposed to work in
Common Lisp.
The Hyperspec says the following about intersection:
"The intersection operation is described as follows. For all possible
ordered pairs consisting of one element from list-1 and one element
from list-2, :test or :test-not are used to determine whether they
satisfy the test [of equality]....For every pair that satifies the
test, exactly one of the two elements of the pair will be put in the
result."
That tells me that if you have 3 A's in one list and 2 A's in the
other, you'l...

**ray-triangle intersection and ray-quadrics intersection**Hi,
Is anyone has good links or c++ source code for ray-triangle intersection
and ray-quadrics intersection? Thank you!
RS
RS wrote:
> Hi,
>
> Is anyone has good links or c++ source code for ray-triangle intersection
> and ray-quadrics intersection? Thank you!
>
There's loads of them here:
http://www.google.com/search?q=ray-triangle+intersection
--
<\___/> For email, remove my socks.
/ O O \
\_____/ FTB. The Cheat is not dead!
...

**How to find the intersection point of two intersecting OBBs**I need help understanding how to find the intersection point of two
intersecting oriented bounding boxes.
I am building a rigid body simulator that uses oriented bounding boxes
as the collision boundaries. I have got collision detection working
(via separating axis approach) and am beginning to implement the
collision response. Part of the collision response is to determine the
magnitude of the impulse to apply to the rigid bodies. To accomplish
this, I need the point of intersection of the two OBBs.
I have been using David Eberly's detailed documentation
(http://www.geometrictools.co...

**Intersection**Hej
I have a small problem with finding the intersection of a parametric curve with itself. The curve is defined with x(t) and y(t), meaning I have two, about 10000 elements long, vectors with spatial coordinates and I would like to know when the curve intersects with itself. I believe some kind of approximation will be needed and I am wondering if anyone has been dealing with similar problem before I start writing my own algorithm. I could create an interpolation function with 10000 basis functions but I would like to avoid this due to the stability problems of solving intepolation matrix....

**Robust FCM,Hyperspherical Kmeans, Hyperspherical FCMeans**hi
ı look forward to these codes or improved this one
on pudn only c codes ı m looking for matlab
help me pls...
...

**ray-triangle intersection and ray-quadrics intersection**Hi,
Is anyone has good links or c++ source code for ray-triangle intersection
and ray-quadrics intersection? Thank you!
RS
RS wrote:
> Is anyone has good links or c++ source code for ray-triangle intersection
> and ray-quadrics intersection? Thank you!
For ray-triangle intersections:
"Fast Minimum Storage RayTriangle Intersection"
http://www.cs.virginia.edu/~gfx/Courses/2003/ImageSynthesis/papers/Acceleration/Fast%20MinimumStorage%20RayTriangle%20Intersection.pdf
"Realtime Ray Tracing and Interactive Global Illumination"
http://www.mpi-sb.mpg.de/~wald/Pu...

**Intersection**Richard A. DeVenezia
<rdevenezia@WILDBLUE.NET> wrote:
>data way1;
> merge a(in=ina) b(in=inb);
> by i;
> if ina and not inb
> or inb and not ina
> ;
>run;
The law of the excluded middle applies -- to get into
data way1
a record MUST have come from either
a
or
b
To get the intersection, you code
data way1;
merge a(in=ina) b(in=inb);
by i;
if ina and inb:
run;
Therefore, to get the non-intersection, you can simply code
data way1;
merge a(in=ina) b(in=inb);
by i;
if not (ina and inb):
run;
I've heard the term "albedo" used to refer to...

**Intersection**Hi all,
Does OpenGL provide a way to detect
that two objects are intersecting ?
( for instance, to avoid an object passing through a wall )
If it doesn't, would you be so kind to tell me how I can implement
such a thing without having to compare all coordinates of all objects ?
TIA
Hello
No, OpenGL is only a 3D rendering API. For collision detection, try
googling for "ray triangle collision/intersection" (yes, you need to
detect collision with every triangle that may be an obstacle).
There are lot of improvement to avoid detecting every triangle of the sce...

**What is the distance of two intersecting circles based on the area of intersection?**Hi all,
I want to draw some proper VENN diagrams in which case I have the
radii and areas of two circles, and I know the area of overlap.
I had a look at http://mathworld.wolfram.com/Circle-CircleIntersection.html
- it solves the area of two overlapping circles dependend on the
distance of the
two circles from each other.
I can't figure out how to solve the equation for d.
Anyone here knows what the solution would be?
Thanks
Markus
...

**(A UNION B) MINUS (A INTERSECT B) = not(A INTERSECT B)**Hello,
I'm trying to determine the negation of A intersect B quicker than:
(A UNION B) MINUS (A INTERSECT B)
Is there a standard SQL operator that will do this?
Thanks
cdecarlo@gmail.com wrote:
> Hello,
>
> I'm trying to determine the negation of A intersect B quicker than:
>
> (A UNION B) MINUS (A INTERSECT B)
>
> Is there a standard SQL operator that will do this?
Subselect using NOT IN? Such as
SELECT * FROM B WHERE B.id NOT IN (
SELECT id FROM A
)
Not tested. It seems to be an equivalent approach, but I am not entirely
su...

**Matlab Hyperspherical K-Means and Hyperspherical C Means Codes**I m looking forward to these algorthms on net but there arent matlab files
Kmeans and fuuzy c means's another applications or developments
Has anybody know about that
"ali " <rebelfirst@gmail.com> wrote in message <h4bp3p$iuu$1@fred.mathworks.com>...
> I m looking forward to these algorthms on net but there arent matlab files
> Kmeans and fuuzy c means's another applications or developments
> Has anybody know about that
FUZZY K MEANS:
Search here on google:
http://lmgtfy.com/?q=fuzzy+k+means+matlab+source
http://www.google.com/codesearch?q=fuzz...

**3 Problems with intersections function**Dear all,
I am having problems with the intersections function published by Douglas Schwarz. It may be viewed here: http://www.mathworks.com/matlabcentral/fileexchange/11837-fast-and-robust-curve-intersections
I have 2 problems.
Problem 1: The function works correctly between any two curves. Furthermore, it works correctly for x-amounts of curves if coded in a loop. My problem is that I'd like to perform the operation for any amounts of curves without a loop but so far have not been able to.
The syntax is [xo,yo] = intersections(x1,y1,x2,y2)
Where xo and yo represent the coordinates o...

**3-D Plane Intersection: using intersection as x-axis for 2-D plots on each plane**3-D Plane Intersection: using intersection as
x-axis for 2-D plots on each plane
How Can I do this in simple way?
I tried meshgrid but I can not do this.
On Jan 7, 4:06=A0am, "Sebastian " <sebastianpszczo...@gmail.com> wrote:
> 3-D Plane Intersection: using intersection as
> x-axis for 2-D plots on each plane
>
> How Can I do this in simple way?
> I tried meshgrid but I can not do this.
-----------------------------------------------
The intersection of a plane and a solid 3D object (array) is a 2D
planar array. How can a 2D array be used as an x-axis? ...

**Surface Intersect**I have a circle a certain distance from a flat surface. I would like to
extrude the circle to the surface, so that the cylinder created is
capped off, but where it intersects the flat surface there is a hole.
This is so I can fillet the capped surface and the intersection point
with the flat surface. Then I want to thicken to have a uniform solid
body. What is the best way to do this in Solidworks without a temendous
amount of steps?
Thank you in advance,
Jack
Using the "flat Surface" mentioned as your sketch plane create a new surface
with no hole and use that new surface to ex...

**Intersecting Triangles**I would like to be able to calculate the area that two 2D triangles
intersect. Are there any good ways to do this in Matlab? The
Triangles are defined by their vertices and I can plot them with the
Patch command, but I would like to know the area of their
intersection.
Thanks,
Kaz
Kaz Maro wrote:
> I would like to be able to calculate the area that two 2D triangles
> intersect. Are there any good ways to do this in Matlab? The
> Triangles are defined by their vertices and I can plot them with the
> Patch command, but I would like to know the area of their
> intersection.
> ...

**intersection simulation**X-No-Archive
Hello,
I am teaching myself about java threads and concurrency, and have a
textbook exercise that I am trying to implement, but I am not sure if
my design is even on the right track.
The problem is to model an intersection with trafficlights and 2
sensors at each trafficlight, one for arriving and entering, and one
for exiting..., and cars as threads.
the time the car stays in for, the length of time it takes the lights
to switch colors, and the number of cars must all be definable and easy
to change..
I was consiering having each car as a thread, and sensors and
trafficlight...

**No Intersections Snap?** Can't get the intersection snap to work on a 2d sketch.
The intersections box is checked in system settings under snaps
also tried to select it with the rmb menu.
Is there some setting I'm missing?
On Apr 22, 8:14 pm, "Chris Darwin" <nos...@nospam.com> wrote:
> Can't get the intersection snap to work on a 2d sketch.
>
> The intersections box is checked in system settings under snaps
>
> also tried to select it with the rmb menu.
>
> Is there some setting I'm missing?
When this kind of weird crap starts happening in SW 2007 I reboot...

**Intersecting rectangles**Hello.
I have a set of arbitrary oriented rectangles on a 2-dimensional plane.
I need an algorithm to detect if there is an intersecting pair and
return one such pair when it exists.
I tried searching Google but I couln'd even find an algorithm to
determine if two arbitrary oriented rectngles intersect (probably wrong
keywords...).
Ivan
> Hello.
>
> I have a set of arbitrary oriented rectangles on a 2-dimensional plane.
> I need an algorithm to detect if there is an intersecting pair and
> return one such pair when it exists.
So you got two problems:
1) How to detect...

**Union and Intersection**How can I find the union/intersection of two patches plotted in a
figure?
I have created two patches using the PATCH(X,Y,C) function.
Any suggestions would be welcome.
(Is there a simpler way than using the polybool function in the
mapping toolbox? I don't want to have to give my patches global
positions and have to use map projections on them)
Ian wrote:
> How can I find the union/intersection of two patches plotted in a
> figure?
>
> I have created two patches using the PATCH(X,Y,C) function.
>
> Any suggestions would be welcome.
>
> (Is there a simpler way t...

**intersection of circles**Surprisingly, the following problem isn't easily handled by a couple
of scientific computing packages:
If solution(s) exist, find the intersection points of two circles in
the x-y plane. This requires solving a system of two qudratic
equations in two variables:
1) (x - a)^2 + (y - b)^2 = r1^2
2) (x - c)^2 + (y - d)^2 = r2^2
where the points (a, b) and (c, d) are the centers of two circles of
radii r1 and r2.
For example, if I take a = b = 0, c = d = 0.5, and r1 = r2 = 1, the
two intersection points may be found using Wolfram Alpha. However,
using the solve() function...