alignSegment.RdAlign an NMR spectra to a reference spectrum (cross-correlation)
alignSegment(seg, idx_ref = 1, clim = 0.7, med = TRUE, norm = FALSE)
| seg | matrix or data frame, NMR submatrix containing segments (spectra in rows) |
|---|---|
| idx_ref | int, rown index of reference spectrum |
| clim | num, upper cross-correlation threshold (see Details) |
| med | logical, use median spectrum as reference? |
| norm | logical, minmax normalisation for each spectrum prior to alignment? Useful for viz. |
Matrix of aligned spectral segments
Spectral alignment is obtained by x-positional shifting a spectral segment. The extend of the shift is determined by maximising the cross-correlation with a refrence segment. The refernce can either be a spectrum in seg or the segment median spectrum (parameter idx_ref is ignored then). Non-matching spectral segments, defined by clim (cross-corrleation upper limit, similarity score) are not aligned.
NA
Other NMR:
bline(),
excise1d(),
get.idx(),
lw(),
matspec(),
noise.est(),
normErectic(),
plotload(),
ppick(),
read1d_raw(),
read1d(),
specload(),
spec(),
stocsy1d_metabom8-class,
stocsy(),
storm()