# Create random numbers inside a specific plane in xy plane

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NEFELI GAROUFALI 2022 年 6 月 28 日

Hello everyone!
I am trying to generate some samples. These samples are evenly distributed in rectangular regions of R^2.
To be more specific I want to generate 400 samples in the parallelogram [2,8] x [1,2]
and 100 (different) samples in the parallelogram [ 6 , 8 ] × [ 2.5 , 5.5 ].
Finally I want to plot them in the xy plane.
I have spent hours of searching. Any help appreciated.

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### 回答 (2 件)

Matt J 2022 年 6 月 28 日
I don't understand how you are specifying your parallelograms. However, one way is to use ndgrid and then apply a shear:
[X,Y]=ndgrid(1:10);
X=X(:);
Y=Y(:)+0.5*X(:);
scatter(X,Y)
##### 2 件のコメント表示非表示 1 件の古いコメント
Matt J 2022 年 6 月 28 日
Yes, the same idea applies with rand
N=40;
[X,Y]=deal(rand(N), rand(N));
X=X(:);
Y=Y(:)+0.5*X(:);
scatter(X,Y)

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Torsten 2022 年 6 月 28 日

rng("default")
x = [2;8];
y = [1;2];
R = rand(2,400)
R = 2×400
0.8147 0.1270 0.6324 0.2785 0.9575 0.1576 0.9572 0.8003 0.4218 0.7922 0.6557 0.8491 0.6787 0.7431 0.6555 0.7060 0.2769 0.0971 0.6948 0.9502 0.4387 0.7655 0.1869 0.4456 0.7094 0.2760 0.6551 0.1190 0.9597 0.5853 0.9058 0.9134 0.0975 0.5469 0.9649 0.9706 0.4854 0.1419 0.9157 0.9595 0.0357 0.9340 0.7577 0.3922 0.1712 0.0318 0.0462 0.8235 0.3171 0.0344 0.3816 0.7952 0.4898 0.6463 0.7547 0.6797 0.1626 0.4984 0.3404 0.2238
S = [x(1);y(1)]+[[x(2)-x(1);0],[0;y(2)-y(1)]]*R
S = 2×400
6.8883 2.7619 5.7942 3.6710 7.7450 2.9457 7.7430 6.8017 4.5306 6.7532 5.9344 7.0948 6.0724 6.4588 5.9329 6.2363 3.6615 2.5828 6.1690 7.7013 4.6325 6.5931 3.1212 4.6735 6.2562 3.6562 5.9306 2.7140 7.7585 5.5116 1.9058 1.9134 1.0975 1.5469 1.9649 1.9706 1.4854 1.1419 1.9157 1.9595 1.0357 1.9340 1.7577 1.3922 1.1712 1.0318 1.0462 1.8235 1.3171 1.0344 1.3816 1.7952 1.4898 1.6463 1.7547 1.6797 1.1626 1.4984 1.3404 1.2238

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