Random uniform data points

Question

Simon De Gheselle 2020-3-19

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回答： Moreno, M. 2022-3-20

I am evaluating a positioning technique in a 3D environment (5m x 5m x 3m), is it possible to generate random unform distributed 3D coordiantes?

I am currently using the following code snippet:

a = -(width_dimension/2);
b = width_dimension/2;
rand_x = width_dimension.*rand(number_of_test_samples,1) + a;
a = -(length_dimension/2);
b = length_dimension/2;
rand_y = length_dimension.*rand(number_of_test_samples,1) + a;
a = 0;
b = height_dimension;
rand_z = height_dimension.*rand(number_of_test_samples,1) + a;

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Adam Danz 2020-3-19

编辑：Adam Danz 2020-3-19

在 MATLAB Online 中打开

rand() returns random numbers from a uniform distribution bounded by [0,1].

Are you asking how to return a 3D array of random numbers?

d = rand(10,5,4); % returns 10x5x4 array of randos

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Answer 1

Ameer Hamza 2020-3-19

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编辑：Ameer Hamza 2020-3-19

在 MATLAB Online 中打开

You can generate the coordinates with a single call to rand()

width_dimension = 5;
length_dimension = 5;
height_dimension = 3;
number_of_test_samples = 1000;
rand_values = rand(number_of_test_samples, 3) - 0.5;
rand_values = rand_values.*[width_dimension length_dimension height_dimension];

First colums is x-coordinate. Second and third columns are y and z-coordinates respectively.