how can i generate real random numbers?

hello everyone... i want to generate three real random number between 0 and 1 and must be the total of them equal to 1 if i use this code

a = rand(1); b = 1-a;

what c is ? please help me ...

Answer 1

[James Tursa]

See this FEX contribution by John D'Errico:

https://www.mathworks.com/matlabcentral/fileexchange/49795-randfixedlinearcombination

Or this one by Roger Stafford:

https://www.mathworks.com/matlabcentral/fileexchange/9700-random-vectors-with-fixed-sum

[Ameer Kadhim]

thank you so much...

Answer 2

[John D'Errico]

First, they are not truly random if you use a computer and an algorithm. They will only be pseudo-random. So they will at best have characteristics that will be consistent with random numbers. But if you want to generate "real" random numbers, then there are ways to do so, sometimes based on things like radioactive decay.

Next, you cannot generate random numbers as you tried. Instead, you want to use a tool like randfixedsum. Find it on the file exchange, James gave you the link already.