1. This solution is much faster on re-invocation than the one without the persistent num_ones variable. Unless of course it is performed on a much larger (than num_ones) array of 32-bit integer.
2. It is essential to have the statement
The reason for this is that the floor() function has a problem with precision. If can fail with 32-bit integer that are close to 2^32.
For instance, consider this Matlab code and system response:
Determine if input is odd
Is this matrix orthogonal?
Say something funny
Criss-Cross: NHL - Optimize Matrix Size
Unique - Very Very Large Numbers
Hyperspectral Processing: Determine Material Components given a Hyperspectral vector
Top of the Hour : Return from your routine within 1 second of the hour
Is 3D point set Co-Planar?
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