How do I store x-y coordinate values in a 2 Dimension array (n x n) with its x-y position ?

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hahsaka dahsra
hahsaka dahsra 2023-7-17
评论： Chunru 2023-7-19
I have seven x-y coordinates and I would like to store in 2 Dimensional array.
These values are to be plot exactly like in this picture. In an array, the x-y coordinate values can be assign with a number let say 1. 1 is refer back to coordinate 1 (27,10). Another example, 7 holds information for x-y coordinate (50,123).
How i do assign the x-y coordinates in x-y location and store in 2D array like in the picture ?
Thanks
  2 个评论
the cyclist
the cyclist 2023-7-17
What exactly is the input you have? Can you upload the input data? Use the paper clip icon in the INSERT section of the toolbar.
Torsten
Torsten 2023-7-17
编辑：Torsten 2023-7-17
I don't understand what you want to store and how.
What I can say is that a usual numerical 2d-matrix can only store a single scalar in each (row,column)-position.
If you want to store two coordinates in one specified position, you either have to use two numerical arrays (X and Y) or you have to use a cell array.

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Chunru
Chunru 2023-7-18
Ran in:
xy = [27 104;
35 100;
47 102;
25 110;
35 114;
47 109;
50 123];
A = zeros(7, 7); % 5x5 is enough for your case
% You may need to adjuxt the following
xc = 25+(0:6)*5+2.5; % centre of grid
yc = 100+(0:6)*5+2.5;
for i=1:size(xy, 1)
[~, ix] = min(abs(xy(i, 1) - xc));
[~, iy] = min(abs(xy(i, 2) - yc));
A(iy, ix) = i;
end
A
A = 7×7
1 2 0 0 3 0 0 4 0 0 0 6 0 0 0 5 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 7 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0 0
  2 个评论
hahsaka dahsra
hahsaka dahsra 2023-7-18
Thank you very much for understanding the objective of the code. That's brilliant. I would to understand why you add 2.5 for the centre of the grid. Thank again.
xc = 25+(0:6)*5+2.5; % centre of grid
yc = 100+(0:6)*5+2.5;
Chunru
Chunru 2023-7-19
The grid 25+(0:6)*5 is 25, 30, 35, ...
The center of grid is 27.5, 32.5, ...
So you need to add 2.5 yo obtain the centre of grid.

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