how to show points?

Question

ker fang fang 2015-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/170487-how-to-show-points

回答： Anju 2022-10-1

hi, i have these points, (10,90),(70,90),(10,30),(70,30). how do i plot in matlab? i want the display graph to be showing those points. can anyone hep me?

the axis

axis([0 100 0 100]);

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ker fang fang 2015-1-19

在 MATLAB Online 中打开

sorry, i got it already. but another question. once i plot thoe points. how to i scatter other random points around those points?

this the way to plot points. but how do i make other random points scatter around it?

x = [10 10 70 70]; 
y = [30 90 30 90]; 
plot(x, y, 'o');
axis([0 100 0 100]);

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Answer 1

Chris Barnhart 2015-1-19

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https://ww2.mathworks.cn/matlabcentral/answers/170487-how-to-show-points#answer_165304

This is an answer. Not sure its what you wanted.

x = [10 10 70 70]; y = [30 90 30 90]; % make some random vectors 100x4 nrp = 100; r1=10* (rand(nrp, length(x)) - 0.5); r2=10* (rand(nrp, length(x)) - 0.5);

% extend x and y into 100x4 then add the random variable rx = repmat(x, nrp, 1) + r1; ry = repmat(y, nrp, 1) + r2;

plot(x, y, 'o', rx, ry,'.');

Here the random points fill a square block around the points. If you want a circular region, generate a random r and a random angle, then convert to x and y. If you want a density to drop off, thats a bit more difficult.