Create a number between specific values

I want to create a random or not value between specific values:

I have three double a,b,c a>b>c

and i want d number to be (a+c)/2<d<a

Answer 1

[Jan]

A random value between the two limits:

lim1 = (a + c) / 2;
lim2 = a;
d    = lim1 + rand * (lim2 - lim1)

[Davidra Fantarina ANDRIAMISAINA]

It works but i want to know if the value is strictly between the two limits?

[Walter Roberson]

Yes. rand() can never be exactly 0 or exactly 1, so d can never be exactly lim1 or exactly lim2.

[Jan]

@Davidra: It is a secure information, if Walter posts it. But you can find this in the documentation of Matlab also: doc rand:

 rand returns a single uniformly distributed random number in the
 interval (0,1).

The round parentheses mean the open interval without 0.0 and 1.0.