As a general comment on your code, you want to loop with the innermost index in the tightest loop since Julia arrays are column major.
Yeah I was trying to debug before optimizing. Thanks again 
Well, your original question was about performance.
I was trying to debug differences between using matrix notation and for-loop notation and first thing I was confused about was the timing difference and then later discovered they weren’t even giving same results.
Static in the sense that the array size is known at compile-time, not at runtime, allowing the compiler to specialize the code for the array length (e.g. completely unrolling small loops).
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