Distance between points in a graph
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Varun Shrishail Soraganvi
on 23 Jan 2022
Edited: Walter Roberson
on 24 Jan 2022
I have plotted a graph which has 5 points. Is there any in built feature in Matlab which can help me calculate the distance between each point? Any help is appreciated, Thank you :)
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Accepted Answer
Image Analyst
on 23 Jan 2022
I your points are in a matrix called xy, with each point being a row, and you want to find the distance of every point to every other points, you can use pdist2() in the Statistics and Machine Learning Toolbox:
xy = rand(5, 2); % Sample points.
% Compute distances between all points:
distances = pdist2(xy, xy)
The row is one point, and in each column are the distances to the other points, so for example, distances(4, 2) is the distance from the point in row 4 to the point in row 2. Of course this will be the same distance as distances(2, 4) and the diagonal will be zero since the distance of any point to itself is zero.
More Answers (1)
Walter Roberson
on 23 Jan 2022
pdist() can be configured with a number of different distance metrics.
However, I have to wonder if you are assuming that the 5 points are on a curve, and if you want the distance along the curve. If so then we would need to know what model you are using for the curve joining the points.
2 Comments
Walter Roberson
on 24 Jan 2022
Edited: Walter Roberson
on 24 Jan 2022
You asked for "distance", but you did not specify how distance was to be calculated
xy = rand(5, 2); % Sample points.
distances_cheb = squareform(pdist(xy, 'chebychev'))
distances_city = squareform(pdist(xy, 'cityblock'))
distances_euc = squareform(pdist(xy, 'euclidean'))
distances_ma = squareform(pdist(xy, 'mahalanobis'))
distances_mi = squareform(pdist(xy, 'minkowski', 3))
... and others
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