Find the nearest whole number and whole number+/-0.5 for a given value

Hi guys,

I have a simple example. If I have a value:

value = 0.73;

What I want to do is to automatically find what the nearest whole number is +/- 0.5 for a given value. So for example, I want to have something like this:

    v0 = 0.73;
    v1 = some code; %Tells me 0.5
    v2 = some code; %Tells me 1.0

Does this make sense? Here's another example:

v0 = 102.21;
v1 = some code; %Tells me 102.0
v2 = some code; %Tells me 102.5

Thank you!

Answer 1

[jgg]

You want

 v2 = ceil(2*v0)/2
 v1 = floor(2*v0)/2

The "round to the closest value" is

 round(2*v_0)/2

Answer 2

[John BG]

may be you find the following useful:

v0=100*rand
v0_floor=floor(v0)
v0_ceil=ceil(v0)
v5=.5*(v0_floor+v0_ceil)
if v0<v5 
   v1=v0_floor;v2=v5
   else
      v1=v5;v2=v0_ceil
end