To plot lines between points
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I have a matrix
M = [a b; c d; e f]
these values are a,b,c,d,e,f are obtained from selecting random points on an image using 'getpts' command
The values are large and decimal, as i'm selecting them from an image
I need to draw(plot) 2 lines between (a,b),(c,d) and (a,b), (e,f)
need help
回答（1 个）
Hi,
To plot two lines between the points ((a, b)), ((c, d)), and ((e, f)) in MATLAB, you can use the “plot” function. Refer to an example code below for better understanding:
% Example coordinates
M = [100.5, 200.3; 150.7, 250.8; 120.9, 180.4];
% Extract points
a = M(1, 1);
b = M(1, 2);
c = M(2, 1);
d = M(2, 2);
e = M(3, 1);
f = M(3, 2);
% Plot the lines
figure; % Create a new figure window
hold on; % Hold on to plot multiple lines
% Plot line between (a, b) and (c, d)
plot([a c], [b d], 'r-', 'LineWidth', 2); % Red line with width 2
% Plot line between (a, b) and (e, f)
plot([a e], [b f], 'b-', 'LineWidth', 2); % Blue line with width 2
% Add labels and title for clarity
xlabel('X-axis');
ylabel('Y-axis');
title('Lines between Selected Points');
legend('(a,b) to (c,d)', '(a,b) to (e,f)');
% Display grid
grid on;
hold off;
For more information on the “plot” function you can refer to the below documentation:
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2015-3-26
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