Questions tagged [distance]
The distance tag has no usage guidance.
65
questions
0
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33 views
The smallest (and biggest) distance of points from the function
please give me an advice.
I have points ("data", x and y coordinates). For these points, I created a residual function
...
2
votes
1answer
79 views
How to find the minimum Hamming distance?
I have a vector $v = (9, 2, 3, 4, 8)$.
Vector space over $\mathbb{Z}_{11}$ is generated by a set:
$e_{1} = (4, 2, 0, 0, 1)$,
$e_{2} = (1, 9, 0, 1, 0)$, $e_{3} = (5, 0, 1, 0, 0)$, $e_{4} = (0, 7, 0, 0,...
4
votes
1answer
158 views
Why does MMA force a DistanceFunctions to be positive?
Consider the following piece of code:
DistanceMatrix[Range[10], DistanceFunction -> Function[{x, y}, x - y]]
I would have expected it to return a skew-symmetric ...
3
votes
1answer
130 views
Distance between two points in a picture
I have this picture:
I'de like to obtain the distance between two of these points. The black scale bar is 3$\mu m$.
To do so, I import the image to Mathematica and call it pic. Then by finding ...
5
votes
1answer
70 views
Improving performace of `GeoDistance` and `NearestNeighborGraph`
I am trying to construct a NearestNeighborGraph of the 3143 US counties, using their latitude and longitude positions.
...
1
vote
1answer
110 views
0
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0answers
24 views
FindClusters Hamming Distance giving error
I am trying to run FindClusters[hex, DistanceFunction -> HammingDistance[IntegerDigits[#, 2, 8], IntegerDigits[0, 2, 8]] &] over a list of data but I keep ...
0
votes
1answer
42 views
How can I plot various points on a world map and compare distances?
How can I plot various points on a world map and compare distances?
For example, the distance between Jerusalem and Westford, MA compared to the distance between Westford, MA and Recife, Brasil? Then ...
17
votes
4answers
909 views
Find the equidistance curve between two curves
I have three function $f(x)=x^x$, $g(x)=\ln(x)^{\ln(x)}$, $h(x)=\ln(x)^2$ and I want to find (numerically) $C$ the center of the circle tangent to the three curves.
I think that one way is to find ...
0
votes
1answer
61 views
Maximize a simple expression based on EuclideanDistance takes too long
Do you know if there is a mistake in this command syntax? It is very simple and still it takes too long. I cannot obtain any result at all:
...
2
votes
2answers
142 views
Get 3D surface grown by constant distance
There is a nice example of how to generate an isometric visualisation of surfaces which are at a constant distance from a given region.
All these examples are just working on one single region. If one ...
16
votes
4answers
454 views
Pathfinding on 2D regions
How can I find a shortest or near optimal route between two points where the route is constrained within a 2D region?
First, consider the following bundle of lines:
...
0
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0answers
70 views
Total Variation Distance(between Gaussians)
I am interested in a tool that calculates the total variation distance between two multivariate Normal distributions. Any help will be much appreciated as I am a complete beginner.(So far, I have ...
1
vote
2answers
104 views
How to find the shortest distance between two regions?
I need to find the shortest distance between the two regions and the two points of the shortest distance, but the following code cannot achieve this requirement:
...
asked Aug 14 '20 at 8:25
A little mouse on the pampas
5,1702 gold badges9 silver badges28 bronze badges
2
votes
1answer
97 views
For an enclosed surface region, how to find the furthest point on that surface to another point that is not on that surface?
I have an enclosed 3D surface (a distorted sphere surface region, which is got by finding an enclosed contour of a 3D volumetric data, and apply RegionBoundary[BoundaryDiscretizeGraphics[ ]] to get ...
7
votes
4answers
641 views
Find smallest distance from a point to a Bézier curve
I wish to find the smallest distance from a point to a curved defined via a Bézier function. I want to do this automatically. For particular cases it is not to difficult. Here is a minimum working ...
2
votes
0answers
50 views
Display minimum distance and minimum-distance path between two points on a polyhedron
Given a genus-zero polyhedron (e.g., PolyhedronData["Dodecahedron"]) and a point $P$ anywhere on its surface, color all points on the polyhedron by the length of ...
5
votes
2answers
442 views
Distance between a point and a curve
I have the general equation of an elipse and a point P0:
elipse=0.31368-0.113863x-0.00127066x^2+0.00329003y+0.000817666xy+0.0000929297y^2
P0={-6.4,172.0}
I would ...
6
votes
1answer
63 views
Force two distance matrices to use and show a common legend
I have two distance matrices. Both are comparing two entities in the same way. I create each matrix using
...
4
votes
1answer
121 views
Distance between two cities
I need help calculating the distance between 2 cities in Wolfram MAthematica. I would need to create two drop-down lists of European capitals. After selecting any two cities from the lists, I would ...
6
votes
1answer
130 views
How to TextRecognize sparse grid of tabular data?
I cannot give the actual image (contains private information) but the results of
...
5
votes
2answers
92 views
Breaking a Kinked line into $(n-1)$ segments of equal Euclidean distance?
I'm wondering if anyone has a nice solution for breaking a kinked line into $(n-1)$ segments of equal euclidean distance?
Here is a MWE of my attempt. I think it does the job, and I'm sure the code ...
1
vote
2answers
68 views
How to change color of DistanceTransform image?
I want to overlay a set of points onto a distance transform of them. But, I don't really like the black default color of the distance transform. Is there a way to change this?
Given the points ...
0
votes
1answer
278 views
Calculating the distance between two points and get direction [closed]
I am programming a molecular dynamics program with periodic boundary conditions. Here, I have a problem:
I have a list of coordinates like
...
10
votes
2answers
649 views
Distance measures on a map of a game
I have an image which my DM made of map for a DND game and I want to do two things.
Click on two points on my map, then based on the key for scaling have Mathematica tell me how far apart those ...
3
votes
2answers
375 views
Find the smallest and largest distance between two points distributed in 3D space
Suppose I have some 3D points, e.g. {{0, 0, 1}, {0, 0, 1.3}, {0, 1, 0}, {1.2, 0, 0}}. Now I want to find the smallest and largest distance between two points.
A ...
2
votes
1answer
81 views
Perpendicular chord lengths from the boundary points of an arbitary 2D shape
Let's generate an arbitrary convex domain with smooth boundaries:
Graphics[BSplineCurve[{{1, 4}, {5, 3}, {9, 4}, {5, 5}, {8, 7}},
SplineClosed -> True]]
I'...
3
votes
1answer
73 views
How to compute distance between movable items in the screen?
I want to design a box in which I can move a set of items. Specifically, there should be N items (e.g. little balls with numbers inside).
Items can be arranged with the mouse inside a box, and, in ...
14
votes
3answers
415 views
Is there a built-in function I can use to measure the similarity of two trees?
This is a higher level question, and I don't expect a full answer, but maybe a nudge in the right direction would help, or maybe there is a built in Mathematica function that does something very ...
5
votes
1answer
105 views
How do I plot a distance map in $R^2$ to a curve given in form $y=f(x)$?
As in the title, I'd like to display image using DensityPlot representing distance to a given curve, e.g., $y=x^2$.
I find it difficult to derive distance ...
7
votes
2answers
984 views
Find distance along a path (GPS coordinates)
I have an imported version of a GPX file plotting the route of a trail. I also have a list of coordinates for waypoints along the route. I am trying to calculate how far along the route each ...
3
votes
0answers
123 views
Finding the shortest distance of two points and an area
So I have a region defined by something like MeshRegion[{{0, 0}, {1, 1}, {2, 1/2}, {2, -1/2}}, {Line[{1, 2}], Line[{2, 3}], Line[{3, 4}], Line[{4, 1}]}], and two ...
10
votes
2answers
215 views
How to return the coordinates of the respective 3 vertexes of a DelaunayMesh's face?
I have a set of points pts1 and a point redPts as below:-
...
3
votes
1answer
158 views
How to get the coordinates of the closest point along a line?
I have a plot as below (the plot is just for illustration purpose. in my real problem, I just have pts1):-
...
2
votes
0answers
242 views
How to speed up DistanceMatrix? [duplicate]
I need to compute a fast DistanceMatrix (euclidean distance) of a large vector. Let say
x = Table[Sin[t],{t,1,10000}]
But pre defined function
Distancematrix[x] ...
3
votes
2answers
455 views
How to calculate the distance that from the pixel to image edges
I have such image:
It is a binary image, I mean the pixel value is 0 or 1, but now, I hope to replace every pixel value with ...
1
vote
3answers
405 views
Find the value of parameter for the closest point on a curve
I can find the nearest point to {x0,y0} on a curve fast and easy by replacing the curve {x[t],y[t]} with line segments:
...
3
votes
2answers
150 views
Negative Correlation Distance
Bug introduced in 8.0 or earlier and fixed in 11.2.0
CorrelationDistance[{-53.0, 4.3}, {-23.0, 5.4}] is a negative number. It is close to zero, to be sure, but ...
2
votes
1answer
215 views
How to measure distance exactly from a graph?
Is there any way to measure a distance from a graph in centimeter or inch exactly in Mathematica? I tried to use toolbar Ruler but I can only use it to measure width horizontally and can't switch it ...
3
votes
0answers
115 views
Getting Distances from Nearest Function [closed]
I am fairly new to mathematica. I am trying to find a way to mock python's KDTree.query function in mathematica. Basically I have 9 vectors (each length two). I want to know the three closest vectors ...
0
votes
1answer
182 views
use of GeoDistance on WGS84 spheroid
The reference WGS84 describes the Earth as oblate spheroid with semi-minor axis (radius to poles) of 6356.752 km and semi-major axis (radius to equator) of 6378.137 km.
I am considering the distance ...
2
votes
1answer
140 views
How can I subtract the components of these 2 solutions if the components are interpolating functions?
I have solved for solutions of the Lorentz system but for some reason Mathematica spit out InterpolatingFunction[] as components.
Input 1:
...
1
vote
1answer
74 views
A measure of disconnectedness for points in the plane
I am inexperienced with Mathematica, so I apologize if I advertise my ignorance.
I am trying to write a code that will assign a measure of 'disconnectedness' to a finite set $S$ of points in the ...
1
vote
2answers
128 views
Region and Infinite Line Intersection does not yield correct results with Maximize
I have a list of points pixelvaluepos that I can use to convert to a BoundaryMeshRegion. I also happen to know the centroid <...
3
votes
0answers
112 views
Delaunay link distance
I have a Delaunay mesh region. To start with, I give a simple example here:
pts = RandomReal[{-1, 1}, {50, 2}];
R = DelaunayMesh[pts];
The next step I want to do ...
1
vote
2answers
139 views
Finding points outside of a disk
Here I have a list of points on the plane:
lst = RandomReal[{-5, 5}, {55, 2}];
and a disk with the radius r=1 drawn around ...
0
votes
1answer
153 views
Generating matrix of distances between points in cylindrical coordinates
I am working on an analytical model for the sound intensity generated from a vibrating cylinder. Part of this work requires me to split the cylinder up into a number of elements, with the more ...
1
vote
1answer
414 views
6
votes
2answers
948 views
Good way to create a similarity / distance matrix for a large dataset [duplicate]
I have a large dataset with rows (100k+) for products and columns for features.
Now I want to create a similarity matrix with NormalizedSquaredEuclideanDistance. ...
0
votes
1answer
78 views
min distance in a graph
How would I find the min distance between two vertices in a graph.
What function should I use?
For example, in the above, $d(2,4)=2$ and $d(2,3)=1$
