Function: back_to_back_exp

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List of PyCrysFML08 Dictionaries

List of PyCrysFML08 Functions

USE

back_to_back_exp returns the value of a back to back exponential peakshape function:

If x < 0:

f = (0.5 * alpha * beta / (alpha + beta)) * exp(alfa * x)

If x >= 0:

f = (0.5 * alpha * beta / (alpha + beta)) * exp(-beta * x)

r = back_to_back_exp(x : float,alpha : float,beta : float)

Variable	Type	Description
x	float	Value at which the function is evaluated.
alpha	float	Function parameter
beta	float	Function parameter
r	tuple	The tuple returned by the function. r[0] : int, error code. If non-zero, an error has occurred. r[1] : str, error message. r[2]: float, value of the function at x.