how to find distance between two points?

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bsd
bsd 2011-9-27
回答： Daksh 2023-2-2
Hai,
I need to find the distance between two points in the figure, which I have plotted. Is there any function in matlab that could find the distance between two points. Looking for your reply.
BSD

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Lucas García
Lucas García 2011-9-27
You can use the pdist function in the Statistics Toolbox:
e.g: distance between points (0,0) and (2,1)
>> X = [0,0;2,1];
>> d = pdist(X,'euclidean')
d =
2.2361
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Mohd Aaqib Lone
Mohd Aaqib Lone 2019-11-5
Hi Lucas García,
I want to measure distance between one point to other more than ten points, what i mean is like i have ten markers on one line and i want to compute distance from the ist marker with other 9 markers. How can I do it in MATLAB. Please answer.
zoher badr
zoher badr 2021-2-14
in this case you have to have a nested loop so you gaurantee to reach each point int the list

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更多回答（6 个）

MathWorks Support Team
The distance between two points x and y is the same as the magnitude of the vector that points from one point to the other:
>> x = [0 0];
>> y = [2 1];
>> norm(x-y)
ans =
2.2361
  2 个评论
Peize Li
Peize Li 2020-12-30
Will i get a column vector of distances if I try norm(x-y), where x and y are two 3 x 2 vectors?

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Walter Roberson
Walter Roberson 2011-9-27
No. You will have to code it yourself.
There are many different possible meanings for "distance". See http://en.wikipedia.org/wiki/Metric_%28mathematics%29#Examples
Fangjun Jiang
Fangjun Jiang 2011-9-27
Pos=[x1 x2;y1 y2]
D=dist(Pos);
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Fangjun Jiang
Fangjun Jiang 2011-9-27
Sorry, Walter. You are right, the dist() function is from the Neural Network Toolbox.
Fangjun Jiang
Fangjun Jiang 2011-9-27
I am using my new MATLAB version today. It has a bunch of toolbox. Nice!

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Twinkle Jain
Twinkle Jain 2017-3-17
X = [0,0;2,1];
d = pdist(X,'euclidean')
Sohrab Dorodvand
Sohrab Dorodvand 2018-8-2
if i was to compare one point of a 1d graph and to compare the distances between that point(the reference point) to others on the graph. how can i do that?
Daksh
Daksh 2023-2-2
I understand you're experiencing doubts over calculating distance between 2 points in the figure for which you have variable values saved in workspace. You can use one of the following methods for your utility:
  1. norm(): distance between two points as the norm of the difference between the vector elements
  2. pdist(X): Euclidean distance between pairs of observations in X
  3. pdist2(X,Y,Distance): distance between each pair of observations in X and Y using the metric specified by Distance.
  4. distance(): distance between two points in Geographic space
Hope this helps!

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