MATLAB Answers


Decimal random number generator

Asked by sita
on 25 Jan 2013
Latest activity Edited by Thorsten
on 26 Oct 2015
I want to generate a random number generator 0 to 1 should include values with ten decimal points.As default i get only 4 decimals.
Thanking You,

  1 Comment

on 28 Jan 2013
Where did all the comments go? Did you delete them? If so, why? Without them our answers looks a little bit unmotivated, not to say lunatic. Therefore removing important data from a thread is not wanted.

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3 Answers

Answer by Sachin Ganjare on 25 Jan 2013
Edited by Jan
on 25 Jan 2013

out = rand(1, 1);
decimal_out = floor(out * 100000000);
decimal_out = decimal_out\100000000;


Don't you mean "decimal_out/100000000"?
Your're right, that's a typo, must read /. Of course you can do it more efficiently in one line (for example, to generate a row vector of four random values):
x = floor(rand(1,4)*1e10)/1e10;

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Answer by Jan
on 25 Jan 2013

What about using rand() directly, because it satisfies: at least 8 decimal digits already?

  1 Comment

on 25 Jan 2013
The limitation to 4 digits appears in the command line only, see: help format.
format long g
Although I assume your code is just an abbreviated example, I recommend not to use "min" and "max" as names of variables, because this shadows frequently used Matlab commands.
However, I still do not understand your question. What does "fixing the number of decimal points" mean? RAND does reply values like 0.00000000001 also, so what is the problem.

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Answer by Evgeny Pr on 25 Jan 2013
Edited by Evgeny Pr on 25 Jan 2013

Do you have the distribution law for pseudo-random numbers for your problem? You can use RAND function for generate uniformly distributed numbers and define its non-linear (or linear) transformation function:
numbers = rand(10);
transformedNumbers = transform_function(numbers);


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