grapa.shared.maths

Functions dealing with math

@author: Romain Carron Copyright (c) 2026, Empa, Laboratory for Thin Films and Photovoltaics, Romain Carron

Functions

derivative(x, y)	numerical derivative dy/dx for the x and y datapoint series.
derivative2nd(x, y)	Second numerical derivative d2y/dx2 for the x and y datapoint series.
find_nearest(array, value)	Finds in array the value nearest to value.
fractionstr_to_float(frac_str)	Returns a numeric value for floats, or fractions in the form '2/5'
is_number(s)	Returns True is s can be converted to a float.
roundSignificant(series, n_digits)	Rounds the values in series to n_digits significant digits.
roundSignificantRange(series, n_digits)	Rounds the values in series to n_digits significant digits
roundgraphlim(lim)	Returns rounded graph limits.
smooth(x[, window_len, window])	smooth the data using a window with requested size.
trapz(y, x, *args)	At some point numpy changed the function name for its trapz function
xAtValue(x_series, y_series, value[, ...])	Returns the x value where y_series crosses value.

Classes

MathOperator()

To help write nicer code when dealing with math operations on Curves