Support more mathematical functions

[sharkdp]

Basic math

• [ ] erf
• [ ] erfc (complementary error function 1 - erf, useful for better accuracy)
• [ ] beta function
• [ ] zeta function?

Float

• [ ] frac (fractional part)
• [ ] int (integer part)
• [ ] sgn
• [ ] is_infinite
• [ ] is_nan
• [ ] …

Number theory, combinatorics

• [ ] gcd
• [ ] lcm
• [ ] idiv (integer division)
• [ ] binomial coefficient

Bitwise?

• [ ] and, or, …
• [ ] shl, shr

Simple statistics

• [ ] geomean (see interesting observations regarding geomean here: http://typesatwork.imm.dtu.dk/material/TaW_Paper_TypesAtWork_Kennedy.pdf)
• [ ] median
• [ ] stddev

Statistics

• [ ] binomial distribution etc

Numerics:

• [ ] root-finding algorithms
• [ ] numerical diff./integration, see #59

Cryptography

• [ ] checksum / hash functions?