Questions on finding intersections of geometric objects: lines, planes, regions etc. with possible aid of ContourPlot, Interval, InfinitePlane and others.
Exemplary problems:
Questions tagged [intersection]
192 questions
14
votes
4 answers
Find intersecting rectangles groups
I've a list of rectangles in the form
{index, {centerX, centerY}, {width, height}}
I want to find intersecting rectangles list. I want to obtain a list on the form
{{indx...indy},{indt...indz}...}
Every element of this list is a list of rectangles…
Jepessen
- 950
- 6
- 16
5
votes
3 answers
GraphIntersection Problem
I Have a problem when plotting 2 functions. I want to find out where the two graphs intersect eachother. That said, I want the coordinates (x, y) of the point.
p1 = Plot[2/(1 + 20 x^2), {x, 0, 3}, AxesLabel -> {"x", "y"},
LabelStyle -> (FontSize…
radholm
- 53
- 5
3
votes
1 answer
Graphics`Mesh`FindIntersections get extra intersections
Why am I getting some extra intersection points?
Manipulate[b = 2 r + 1;
Show[p1 =
ContourPlot[{x^2 + (y - r)^2 == r^2, x/12 + y/b == 1}, {x, -20,
20}, {y, -20, 20}, Axes -> True, Frame -> False,
AspectRatio -> 1, PerformanceGoal…
kile
- 1,671
- 5
- 10
3
votes
2 answers
Intersection of a plane with surface of ListSurfacePlot3D
If I have a list of points in 3D space that are only roughly located on a surface, this surface can be visualized with ListSurfacePlot3D. How can I find the intersection of this approximate surface with a plane, that spans between two vectors u and…
piiipmatz
- 195
- 4
2
votes
1 answer
how to find intersection between a parametric trajectoy and a point
I'have a 2d-system of differential equations, analitycally solved, depending on a parameter. I know that, by continuity, there exist a minimum value of the parameter such that trajectory passes through a specific point. My problem is to find such…
Mike84
- 77
- 6
2
votes
1 answer
Intersection of two lines
I have two lines:
line1=InfiniteLine[{{0,1},{4,2}}]
line2=InfiniteLine[{{1,2},{4,8}}]
I used RegionIntersection to get intersection of these lines, but I can't get the coordinates of the point in the…
Maja
- 21
- 2
1
vote
1 answer
Computing intersections between a large number of sets: doing it sequentially vs. sending everything to Intersection[...]
Say we want to compute the largest common subset among a very large number of sets $Q_i$. One option would be to simply run the command:
Intersection[Q1, Q2, Q3, Q4, Q5, Q6, Q7, ...];
However, this seems to choke for very large numbers of input…
CA30
- 151
- 7
1
vote
2 answers
Projection on the xy–plane of the curve of intersection of both surfaces
I am trying to make a projection on the xy-plane of the intersection of the surfaces from the functions: 1 + x^2 - y^2, 3 Log[1 + x^2].
Thanks.
Damian Muciño
- 91
- 1
- 4
0
votes
1 answer
How to define where a line intersects its reflection
It is relatively easy to be able to find where two parametric functions intersect each other, but how about when one is a function and the second is its reflection? In the example below is it possible to define the value of intersection on the y…
George
- 11
- 1
-1
votes
1 answer
How to get the intersection of three different curves
There are two functions, f(x,y)=x + y^2 - 8; g(x,y)=-3 x^2 + y^2 - 5;
How can I get the intersection of these two curves?
And how about the intersection among f(x,y),g(x,y) and z=0?
Thanks
Jenny
- 1
- 1