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I'm trying to generate a random integer in the range of -2 and 5 using round and rand functions. I'm able to generate a random integer however it always returns a negative value and a zero.

round(rand(1)*-5)
PRCube
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2 Answers2

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Use randi 

r = randi([-2 5],1)

rand

And if you want to do this only using rand and round Try this: r = round(rand(1)*7 - 2);

Tony Tannous
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heres also a possible way of doing it:

% generate 1000 random integers between -2 and 5
R = ceil(rand(1000,1)*8)-3;

% display MIN / MAX
disp(min(R));
disp(max(R));
dcts
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  • Note that this works because @thomas is using `ceil`, and therefore has to increase the factor by 1 (so is using 8 instead of 7). This works because rand() never generates a true 0 or 1. Otherwise if true 0 is generated, this formula will sometimes (with low probability) generate the number -3. –  Oct 27 '16 at 08:46