evm

v0.1.14

evm v0.1.14 MathHelper

Simple functions to help with common math functions.

Link to this section Summary

Functions

bits_to_words(n)

Bits to words

floor(x)

Simple floor function that makes sure we return an integer type

integer_byte_size(n)

Returns the byte size of an integer

log(x, b)

Simple helper to calculate a log in any given base. E.g. the log_15(30), which would be expressed at MathHelper.log(30, 15)

round_int(n)

Simple round function

Link to this section Functions

Link to this function bits_to_words(n) 
bits_to_words(number) :: number

Bits to words

Examples 

iex> MathHelper.bits_to_words(0)
0

iex> MathHelper.bits_to_words(9)
1

iex> MathHelper.bits_to_words(256)
8
Link to this function floor(x) 
floor(number) :: integer
floor(number) :: integer

Simple floor function that makes sure we return an integer type.

Examples 

iex> MathHelper.floor(3.5)
3

iex> MathHelper.floor(-3.5)
-4

iex> MathHelper.floor(5)
5
Link to this function integer_byte_size(n) 
integer_byte_size(number) :: number

Returns the byte size of an integer

Examples 

iex> MathHelper.integer_byte_size(0)
0

iex> MathHelper.integer_byte_size(1)
1

iex> MathHelper.integer_byte_size(0xfffffffff)
5
Link to this function log(x, b) 
log(number, number) :: number

Simple helper to calculate a log in any given base. E.g. the log_15(30), which would be expressed at MathHelper.log(30, 15).

Examples 

iex> MathHelper.log(225, 15)
2.0

iex> MathHelper.log(240, 15)
2.0238320992392618

iex> MathHelper.log(1024, 10)
3.0102999566398116

iex> MathHelper.log(999999, 9999)
1.500016178459417
Link to this function round_int(n)

Simple round function

Examples 

iex> MathHelper.round_int(3.5)
3
iex> MathHelper.round_int(-3.5)
-3
iex> MathHelper.round_int(-0.5)
0