round random a number

Hello,

Suppose we have a number "3.76" and we want to round it either to 3 or 4 in a random way, how to do it? I didn't find the proper command in Matlab.

Answer 1

[James Tursa]

For purely random rounding regardless of the fractional part:

x = your number
result = round(floor(x)+rand);

[Bruno Luong]

James's solution gives equi-probability between 3 and 4. If one want to simulate some sort of quantification noise, might be it is desired to have larger probability of 4 than 3 for 3.76 as input, something like

round(x+rand-0.5)

or (almost) equivalently

floor(x + rand)

Answer 2

[Layan Alshuhumi]

Make two variables, “Nmax” and “Nmin” and set Nmax to 5 and Nmin to 3 using the first two lines. On the third line, write the code to generate a random floating point number between 3 and 5 referencing your predefined variable