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

Jan Simon
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.

3 Answers

Answer by PG
on 25 Jan 2013
Edited by Jan Simon
on 25 Jan 2013
out = rand(1, 1);
decimal_out = floor(out * 100000000);
decimal_out = decimal_out\100000000;


on 26 Oct 2015

Don't you mean "decimal_out/100000000"?

on 26 Oct 2015

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;

Answer by Jan Simon
on 25 Jan 2013

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

  1 Comment

Jan Simon
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.

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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