Following True or False?

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Sabarinathan Vadivelu
Consider the following example. a and b are two random variables. The loop will exit if and only if a+b=1. Is it true or false?
a=rand;
b=rand;
while(a+b == 1)
a=rand;
b=rand;
end
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Sabarinathan Vadivelu
Sabarinathan Vadivelu 2012-8-27
I found that sometimes the sum was exceeding 1 or less than 1. Why?

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Walter Roberson
Walter Roberson 2012-8-27
While executes as long as the given condition is true, so the loop would only execute as long as the sum was 1.
Note: please take time to review the following: http://matlab.wikia.com/wiki/FAQ#Why_is_0.3_-_0.2_-_0.1_.28or_similar.29_not_equal_to_zero.3F
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Jan
Jan 2012-8-27
编辑：Jan 2012-8-27
If a+b must be 1, simply use:
a = rand; b = 1 - a;
It is extremely unlikely that two random numbers will have a sum of 1. I think the probability is in the magnitude of 10^-53. Therefore rejecting the values until the sum equals 1 will take a looong time.
Walter Roberson
Walter Roberson 2012-8-27
a=rand;
b=rand;
while(a+b ~= 1)
a=rand;
b=rand;
end

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