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:
How to find the position of an element in a vector without using the find function
Angle between two vectors
Flip the main diagonal of a matrix
Visualization of experimental data across a surface
GJam 2014 China Rd B: Dragon Maze
GJam 2014 Rd 1c: Train Cars
Image Processing 01: Vignetting Correction
Usage of java.math : N Choose K with unlimited precision
Reading Web Binary Files (jpg,pdf,tiff,png)
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