utils
This module contains generic utilities for the pydsol code.
- pydsol.core.utils.sign(x: float) float[source]
Return the sign of x. Analogous to other programming languages, the following convention is used:
return -1 for negative x
return +1 for positive x
return 0 when x is zero
return nan when x is nan
- pydsol.core.utils.erf_inv(y: float) float[source]
Approximates the inverse error function (erf) based on the C-algorithm at http://www.naic.edu/~jeffh/inverse_cerf.c.
- Raises:
TypeError – when y is not a number
ValueError – when y is not between -1 and 1 (inclusive)
- pydsol.core.utils.beta(z: float, w: float) float[source]
Calculates Beta(z, w) where Beta(z, w) = Gamma(z) * Gamma(w) / Gamma(z + w).
- Raises:
TypeError – when z or w are not numbers
ValueError – when z < 0 or w < 0
- pydsol.core.utils.sign(x: float) float[source]
Return the sign of x. Analogous to other programming languages, the following convention is used:
return -1 for negative x
return +1 for positive x
return 0 when x is zero
return nan when x is nan
- pydsol.core.utils.erf_inv(y: float) float[source]
Approximates the inverse error function (erf) based on the C-algorithm at http://www.naic.edu/~jeffh/inverse_cerf.c.
- Raises:
TypeError – when y is not a number
ValueError – when y is not between -1 and 1 (inclusive)