chemometrics.mcr.constraint.CumsumNonneg

class chemometrics.mcr.constraint.CumsumNonneg(axis=1, copy=False)

Bases: Constraint

Cumulative-Summation non-negativity constraint

The CumSumNonneg constraint enforces the cumulative sum over the data to always be positive. This is useful for processing first derivative data if for the non-derived data negative entries would be unphysical or at least highly unlikely. Typical example: first derivative of an absorption spectra

Parameters

copy (bool) – Make copy of input data, A; otherwise, overwrite (if mutable)

__init__(axis=1, copy=False)

A must be non-negative

Methods

__init__([axis, copy])	A must be non-negative
transform(A)	Apply cumsum nonnegative constraint

transform(A)

Apply cumsum nonnegative constraint