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)
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"returns a negative value and a zero". That's because you're multiplying a number between 0 and 1 by a negative number. The output will always be negative.TroyHaskin– TroyHaskin2016-10-27 03:11:16 +00:00Commented Oct 27, 2016 at 3:11
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what should I do?PRCube– PRCube2016-10-27 03:13:51 +00:00Commented Oct 27, 2016 at 3:13
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2 Answers
Use randi
r = randi([-2 5],1)
And if you want to do this only using rand and round
Try this: r = round(rand(1)*7 - 2);
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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));
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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.