spectrochempy.analysis.constraints.FixedValues

class FixedValues(profile, values, components=None, blocks=None)[source]

Fixed-values constraint.

States that selected components of a profile must take pre-specified fixed values (e.g. a measured spectrum known to be noise-free, or a known concentration profile on a subset of observations).

Parameters:

profile (str) – "C" (concentrations) or "St" (spectra).
values (array-like) – The fixed values to impose. The shape must be compatible with the constrained profile subset at enforcement time (validated lazily; the skeleton API does not know the number of components or the data shape).
components (list[int], optional) – Component indices to which the fixed values apply. None (default) means “all components”.

Examples

>>> from spectrochempy import FixedValues
>>> FixedValues("St", values=[[0.1, 0.2], [0.3, 0.4]])
FixedValues(profile='St', values=[[0.1, 0.2], [0.3, 0.4]], components=None)

Attributes Summary

`blocks`	Block indices for augmented data (`None` means all blocks).
`components`	Component selection (`None` means "all").
`name`	Short human-readable name of the constraint family.
`profile`	Canonical profile identifier (`"C"` or `"St"`).
`values`	The fixed values to impose.

Attributes Documentation

blocks

Block indices for augmented data (None means all blocks).

Type:: list[int] or None

components

Component selection (None means “all”).

Type:: list[int] or None

name

Short human-readable name of the constraint family.

Type:: str

profile

Canonical profile identifier ("C" or "St").

Type:: str

values

The fixed values to impose.

Type:: array-like

Examples using spectrochempy.analysis.constraints.FixedValues