operation on single elements in MATLAB

Question

Noriham B 2022-7-29

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1770115-operation-on-single-elements-in-matlab

评论： Noriham B 2022-7-29

greeting all the experts,

x=-2:1:2; %coordinates x
n=length(x);
y=x.^2;  %coordinates y
z=[x;y];

from the above example, I will have matrix z (2x5)=[-2 -1 0 1 2: 4 1 0 1 4]. This will give 5 point on the graph which are (-2,4), (-1,1), (0,0),(1,1) (2,4). then, my next step is, i want to find the distance for each points.

distance 1 from (-2,4) to (-1,1)

distance 2 from (-1,1) to (0,0)

distance 3 from (0,0) to(1,1)

distance 4 from (1,1) to (2,4)

My problem/question, how to type the distance formula generally to conduct operation on each elements?

distance formula = sqrt((x2-x1)^2+(y2-y1)^2)

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Answer 1

Matt J 2022-7-29

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https://ww2.mathworks.cn/matlabcentral/answers/1770115-operation-on-single-elements-in-matlab#answer_1017195

编辑：Matt J 2022-7-29

在 MATLAB Online 中打开

x=-2:1:2; %coordinates x
n=length(x);
y=x.^2;  %coordinates y
z=[x;y]
z = 2×5
    -2    -1     0     1     2
     4     1     0     1     4
interDistances=vecnorm(diff(z,1,2),2,1)  %the result
interDistances = 1×4
    3.1623    1.4142    1.4142    3.1623

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Walter Roberson 2022-7-29

vecnorm needs r2017b .

We assume you have a new enough version of MATLAB as you did not enter a release when you created your question.

Noriham B 2022-7-29

noted Prof/Dr./Sir Walter. I will try to get the newer version after this. Thanks :)

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Answer 2

Chunru 2022-7-29

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1770115-operation-on-single-elements-in-matlab#answer_1017200

在 MATLAB Online 中打开

x=-2:1:2;       %coordinates x
y=x.^2;         %coordinates y
z=[x;y]
z = 2×5
    -2    -1     0     1     2
     4     1     0     1     4
d = diff(z, 1, 2)   % diff along 2nd dim
d = 2×4
     1     1     1     1
    -3    -1     1     3
d = vecnorm(d)      % distance
d = 1×4
    3.1623    1.4142    1.4142    3.1623

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Noriham B 2022-7-29

Dear Prof/Dr./Sir Chunru. Tqvm for the help. U also use vecnorm like Matt J. I will study more about vecnorm for future need. Tq also to MATLAB for giving us opportunity to ask for help in this platform.

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