# code/__DEFINES/maths.dm

SIGN | Gets the sign of x, returns -1 if negative, 0 if 0, 1 if positive |
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LPFILTER | Low-pass filter a value to smooth out high frequent peaks. This can be thought of as a moving average filter as well. delta_time is how many seconds since we last ran this command. RC is the filter constant, high RC means more smoothing See https://en.wikipedia.org/wiki/Low-pass_filter#Simple_infinite_impulse_response_filter for the maths |

TOBITSHIFT | Gets shift x that would be required the bitflag (1<<x) |

DT_PROB_RATE | Converts a probability/second chance to probability/delta_time chance
For example, if you want an event to happen with a 10% per second chance, but your proc only runs every 5 seconds, do `if(prob(100*DT_PROB_RATE(0.1, 5)))` |

DT_PROB | Like DT_PROB_RATE but easier to use, simply put `if(DT_PROB(10, 5))` |

## Define Details

### DT_PROB

Like DT_PROB_RATE but easier to use, simply put `if(DT_PROB(10, 5))`

### DT_PROB_RATE

Converts a probability/second chance to probability/delta_time chance
For example, if you want an event to happen with a 10% per second chance, but your proc only runs every 5 seconds, do `if(prob(100*DT_PROB_RATE(0.1, 5)))`

### LPFILTER

Low-pass filter a value to smooth out high frequent peaks. This can be thought of as a moving average filter as well. delta_time is how many seconds since we last ran this command. RC is the filter constant, high RC means more smoothing See https://en.wikipedia.org/wiki/Low-pass_filter#Simple_infinite_impulse_response_filter for the maths

### SIGN

Gets the sign of x, returns -1 if negative, 0 if 0, 1 if positive

### TOBITSHIFT

Gets shift x that would be required the bitflag (1<<x)