Draw a line from one point to ALL points

Question

Delvin 2013-5-19

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链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/76318-draw-a-line-from-one-point-to-all-points

采纳的回答： Image Analyst

So ive plotted a set of x and y arrays. Then i plotted a mean.

How do i draw lines only from this mean to all other points?

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Azzi Abdelmalek 2013-5-19

Can you be more clear, and post your code.

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Answer 1

Image Analyst 2013-5-19

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/76318-draw-a-line-from-one-point-to-all-points#answer_85966

在 MATLAB Online 中打开

Try this demo:

% Generate sample data
thePoints = 3*rand(20,2);
% Find the mean.
referencePoint = mean(thePoints, 1)
xMean = referencePoint(1);
yMean = referencePoint(2);
% Plot the points.
scatter(thePoints(:, 1), thePoints(:, 2), 'LineWidth', 3);
hold on;
plot(referencePoint(1), referencePoint(2),...
  'ro', 'MarkerSize', 15, 'LineWidth', 3);
% Enlarge figure to full screen.
set(gcf, 'units','normalized','outerposition',[0 0 1 1]);
grid on;
% Plot lines from the mean to all the other points.
for k = 1 : size(thePoints, 1)
  x = thePoints(k, 1);
  y = thePoints(k, 2);
  line([x, xMean], [y, yMean], 'Color', 'k');
end

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Delvin 2013-5-19

Thanks, i was about to use the for loop but thought there might be some sneaky hidden matlab command!

Image Analyst 2013-5-19

A for loop is fine, especially for some small amount of iterations. And if the number of points was huge, you wouldn't be doing this in the first place since all the lines would overlap and blend together making a big mess.

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