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## Help >## Functions |

The dialog window "Functions" assists in calculations of values for functions that are commonly used in hydrogeology.

The dialog window is opened by "Help > Functions...".

Tab examples of the dialog window "Functions".

Explanatory table

Tab "Special functions - 1" |
The most common special functions in drawdown analytical solutions: well function, leaky aquifer well function, M(u, β) |

Tab "Special functions - 2" |
Function of Bolton, Well function for a well of finite diameter, F(u, β) function for slug tests |

Tab "Error function (erfc)" |
Calculates error function (erf) and complimentary error function (erfc) |

Tab "Bessel functions" |
Calculates the main functions of Bessel |

Tab "Log functions, power functions" |
Calculates logarithmic, power and other axillary functions |

Tab "Trigonometric functions" |
Calculates trigonometric, hyperbolic, reverse trigonometric and reverse hyperbolic functions in rad and degrees. |