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Create random values between two decimal values

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Adrian
Adrian 2012-10-10
I have written this code so far:
%create initial elastic net points as evenly spaced in horizontal position
%with random vertical components.
%create the initial matrix
en_points = zeros(NUM_EN_POINTS,2);
%make the x comp evenly spaced horizontally spanning the length of cities
en_points(1:NUM_EN_POINTS,1) = transpose(linspace(0,1,NUM_EN_POINTS));
%make the y comp a random value between the cities
en_points(1:NUM_EN_POINTS,2) = rand();
What I am trying to do is make column 2 be a random variable between two decimal values, which are (0.5 - l, 0.5 + l).
Is this possible?

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采纳的回答

Razvan
Razvan 2012-10-10
en_points(:,2) = (0.5 - l) + 2*l*rand(NUM_EN_POINTS,1);

更多回答（2 个）

Andrei Bobrov
Andrei Bobrov 2012-10-10
use unifrnd from the Statistics Toolbox
en_points(1:NUM_EN_POINTS,2) = unifrnd(.5 - l,.5 + l,NUM_EN_POINTS,1);
OR
en_points(1:NUM_EN_POINTS,2) = .5 - l + 2*l*rand(NUM_EN_POINTS,1);
Image Analyst
Image Analyst 2012-10-10
Perhaps you overlooked the first example in the help for rand(). Here it is:
Example 1
Generate values from the uniform distribution on the interval [a, b]:
r = a + (b-a).*rand(100,1);

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