Performance of tables slower than built in?

[Ola Fosheim Grøstad]

On Wednesday, 22 May 2019 at 00:22:09 UTC, JS wrote:
> 	for(int i = 0; i < res; i++)
> 		QuarterSinTab[i] = sin(PI*(i/cast(double)res));	

Btw, I think this creates a half sine, not a quarter, so you want 
(?):

      QuarterSinTab[i] = sin(PI*(0.5*i/cast(double)res));

> 	QuarterSinTab[$-1] = QuarterSinTab[0];

This creates a discontinuity if you create a quarter sine, in 
that case you probably wanted:

        QuarterSinTab[$-1] = sin(PI*0.5)

Otherwise you will never get 1 or -1.

But none of these affect performance.