Current Events > Got a job/PhD interview scheduled next month and the imposter syndrome is

(+) Yeah! (+)

already kicking in eheu

It involves coding, which I haven't done in years ever since I finished university

Just remember

float Q_rsqrt( float number )
{
long i;
float x2, y;
const float threehalfs = 1.5F;

x2 = number * 0.5F;
y = number;
i = * ( long * ) &y; // evil floating point bit level hacking
i = 0x5f3759df - ( i >> 1 ); // what the fuck?
y = * ( float * ) &i;
y = y * ( threehalfs - ( x2 * y * y ) ); // 1st iteration
//y = y * ( threehalfs - ( x2 * y * y ) ); // 2nd iteration, this can be removed

return y;
}

catfan2008 posted...

0x5f3759df

is that a memory address? Since they're usually hex-based iirc

https://en.wikipedia.org/wiki/Fast_inverse_square_root

You know, I was actually wondering why it was generally accepted Inverse Square Root was computationally faster and cheaper.

Had no idea it was popularized by Quake III Arena code

catfan2008 posted...

https://en.wikipedia.org/wiki/Fast_inverse_square_root

That's computer science level coding. Thankfully I'd only need to do chemical engineer level coding