On 19 January 2011 16:25, Ted Dunning <[email protected]> wrote:
> Slightly slower,
Unfortunately, I suspect it is about twice as slow for this case,
because FastMath.ceil() actually calls FastMath.floor().
Not ideal for FastMath !
>
> double y = floor(x):
> double d = x - y;
> if (d > 0.5) {
> return ceil(x);
> } else {
> return y;
> }
>
> but it gives your desired result with little (visible) special casing.
>
> On Wed, Jan 19, 2011 at 8:04 AM, sebb <[email protected]> wrote:
>
>> FastMath.rint(x) has the following code:
>>
>> double y = floor(x);
>> double d = x - y;
>>
>> if (d > 0.5) {
>> return y+1.0; // round up
>> }
>> ...
>>
>> For -0.5 < x < 0 the rounding up generates +0.0 - rather than -0.0,
>> as expected by the sign of the input parameter.
>>
>> Is there an easy way to fix this, other than explicitly checking for y ==
>> -1.0?
>>
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