Generating one random number from a given range of numbers.

This may be a poor question but I can't seem to find a usable answer. I need to generate one random number from a range 2/3 X to X

So if I were to set X to 30 I would want one random value from 20 to 30 likewise if I set X to 300 I would want a value from 200 to 300...

Does anyone have any suggestions for how to go about this? Thanks in advance.

Answer 1

[Fangjun Jiang]

R = randi([IMIN,IMAX],...) returns an array containing integer values drawn from the discrete uniform distribution on IMIN:IMAX

Answer 2

[Bosong Lin]

Hi Rich,

If I understood your question, I would do it this way: 1/3*X*rand()+2/3*X; rand() returns a single uniformly distributed random number in the interval (0,1).

Bosong

[Rich Cavanaugh]

I feel like this is close, but I need an integer return. I am using this piece of the program to randomly select an index in the last third of a matrix so i can change it's value.