Assess Spectral Angle Between Reference and Test Spectra

As assess.mismatch(), but reports the spectral angle (in degrees) between each fluorophore's reference and test spectra rather than their cosine similarity. The angle is acos() of the same cosine value assess.mismatch() returns, so the two metrics are a strictly monotonic transform of one another – but unlike cosine similarity, spectral angle increases with divergence, so it can be plotted directly against other divergence-increasing metrics (e.g. mismatch distance) without an inverted axis.

Usage

assess.mismatch.angle(reference.variants, test.variants)

Arguments

reference.variants

Named list of spectral variant matrices (one per fluorophore), as returned in the variants element of get.spectral.variants(). Row 1 of each matrix is treated as the reference spectrum.

test.variants

Named list of spectral variant matrices in the same format as reference.variants, to be compared against it.

Value

A one-column numeric matrix of spectral angle values in degrees (column name "Angle"), one row per fluorophore common to both lists.