I need to create a vector of indices for x and y coordinates and save with assigned value

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Angela Puccini 2021-8-27

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评论： Angela Puccini 2021-8-27

I need to create a vector of indices that labels each point, for example point with index 1 that has x and y coordinates x(1), y(1) and save it into a vector such as points_index

x = [1.22, 2.33, 4.56]

y = [5.6, 7.3, 8.2]

points_index = [1 2 3]

any help is much appreciated thank you

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Angela Puccini 2021-8-27

I dont think I explained it very well, it should be

I need to create a vector (points_index) that labels each point starting at 1 and going through to n, with coordinates x and y. For point 1 in the points_index would have coordinates x(1), y(1), point 2 would have coordinates x(2), y(2) using Matlab

x = [1.22, 2.33, 4.56]

y = [5.6, 7.3, 8.2]

points_index = [1 2 3]

when I look up point 1 in the command window it should bring up the x and y coordinate

Wan Ji 2021-8-27

I dont think I catch your idea. What is called 'look up', why not use x(i), y(i) to search the points you want?

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回答（1 个）

Chunru 2021-8-27

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https://ww2.mathworks.cn/matlabcentral/answers/1441819-i-need-to-create-a-vector-of-indices-for-x-and-y-coordinates-and-save-with-assigned-value#answer_775499

在 MATLAB Online 中打开

x = [1.22, 2.33, 4.56];
y = [5.6, 7.3, 8.2];
for i=1:length(x)
    points(i).x = x(i);
    points(i).y = y(i);
end
points(2)
ans = struct with fields:
    x: 2.3300
    y: 7.3000