random Distribution Points inside rectangle

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MOTHANA LAFTA 2017-2-5

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编辑： MOTHANA LAFTA 2017-2-6

hi every one how can i distribute randomly a number of points inside rectangle and every point has x,y ex: px(1)=100; py(1)=-100; and so forth where the rectangle code as shown bellow:-

x=-1100;
y=-1100;
rectangle('position',[x,y,2200,2200],'LineWidth',2,'LineStyle','--');

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Answer 1

Image Analyst 2017-2-5

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在 MATLAB Online 中打开

Try this:

numPoints = 1000;
width = 2200;
x = -1100
y = -1100;
rectangle('Position', [x, y, width, width],'LineWidth',2,'LineStyle','--');
grid on;
xRandom = width * rand(1, numPoints) - width / 2;
yRandom = width * rand(1, numPoints) - width / 2;
hold on;
plot(xRandom, yRandom, 'r.', 'MarkerSize', 10);
title('Random Points Inside a Rectangle', 'FontSize', fontSize, 'Interpreter', 'None');
xlabel('X', 'FontSize', fontSize);
ylabel('Y', 'FontSize', fontSize);
axis equal;
% Put axis at origin
ax = gca;
ax.XAxisLocation = 'origin';
ax.YAxisLocation = 'origin';
% Set up figure properties:
% Enlarge figure to full screen.
set(gcf, 'Units', 'Normalized', 'OuterPosition', [0 0 1 1]);
% Get rid of tool bar and pulldown menus that are along top of figure.
set(gcf, 'Toolbar', 'none', 'Menu', 'none');
% Give a name to the title bar.
set(gcf, 'Name', 'Demo by ImageAnalyst', 'NumberTitle', 'Off')

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MOTHANA LAFTA 2017-2-6

编辑：MOTHANA LAFTA 2017-2-6

thanks dear i wish you all the best

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Answer 2

Bjorn Gustavsson 2017-2-5

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链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/323482-random-distribution-points-inside-rectangle#answer_253443

Have a look at the documentation of rand. That function gives you uniformly distributed random numbers between 0 and 1 (have forgotten about what the limits are, but you'll see). Then think about what happens if you add and multiply those numbers with some fixed constants, then think about what happens if you combine 2 such numbers into a 2-d vector. If you want some other distribution of the points inside your rectangle or want the points to have some covariance structure you'll have to work those out as well.

HTH