MATLAB round function - how does it round .5 up or down??

Question

How does MATLAB's round function work with .5? Like 5.5? Does it round up to 6, or round down to 5? The Mathworks page talking about this function says nothing about this, and the example doesn't help either!

Here is the mathworks page for the MATLAB round function:

mathworks round function page

Answer 1

Wikipedia knows:

round(X): round to nearest integer, trailing 5 rounds to the nearest integer away from zero. For example, round(2.5) returns 3; round(-2.5) returns -3.

There's a little more information on this scheme (Round half away from zero), and many others, in the article on rounding.

Answer 2

>> round([-0.5 0.5])

ans =

    -1     1

Answer 3

0.5 is the threshold at which starts rounding up, but you shouldn't really be concerned with this, because most computations are not bound to give exactly 0.5. A deviation from even a single bit might cause it to round down instead.

Answer 4

please type 'round(0.5)' in matlab... more efficient than writing on here