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Abdulhameed
Abdulhameed

Reputation: 210

Plot equal-spaced points within a square (n x n)

How could I plot equally spaced points in square in matlab. As shown below

                          . . . .
                          . . . .
                          . . . .
                          . . . .

The figure below is for a 4x4 dimension square. I would like to reference each point and store in a variable [Point(i).xcord, Point(i).ycord] and plot as shown below:

For i=1:1:16
Point(i).xcord = <What expression goes here>
Point(i).ycord = <what expression goes here>
plot(Point(i).xcord, Point(i).ycord)

In order to get an output in grid form as shown above, could anyone explain a simple way of doing this.

Upvotes: 1

Views: 540

Answers (1)

Luis Mendo
Luis Mendo

Reputation: 112699

You can use ndgrid as follows:

N = 4; % Square size
[xcord, ycord] = ndgrid(1:N); % generate all combinations. Gives two matrices
plot(xcord(:), ycord(:), '.') % plot all points at once
axis([0 N+1 0 N+1]) % set axis limits
axis square % make actual sizes of both axes equal

xcord, ycord are matrices that contain the coordinates of the points. This is faster than using a struct array as in your code. You can index them such as xcord(2,3).

If you need to convert to a struct array, use

Point = struct('xcord', num2cell(xcord(:)), 'ycord', num2cell(ycord(:)));

Upvotes: 2

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