NMRPipe:POLY and BASE baseline correction

From NMR Wiki

Relevant functions: POLY (polynomial baseline correction) and BASE (linear baseline correction)

Contents 1 Function POLY 1.1 Concepts 1.2 Options 1.3 Examples

Function POLY

Function POLY calculates a polynomial best fitting selected points on the vector. After that values of that polynomial at corresponding points are substracted from the data vector thus giving the baseline-corrected spectrum.

Concepts

node - group of adjacent data points from data vector selected for the fitting of baseline

Ways to define node points:

option	example	meaning
pts	5pts	coordinate (point number) of the data point in data vector
%	5.5%	by percent offset from the beginning of data vector
ppm	10.35ppm	by ppm coordinate
hz	1603.5hz	by offset of the point in hertz from the beginning of the data vector

Options

option	value	meaning
-sx1	x1 [1]	Subtract Region
-sxn	xn [SIZE]	Subtract Region
-fx1	y1 [1]	Initial Fit Region
-fxn	yn [SIZE]	Initial Fit Region
-x1	y1 [1]	Sets -sx1 and -fx1
-xn	yn [SIZE]	Sets -sxn and -fxn
-nl	node list
-nw	integer	determines number of points in nodes as 2*nw + 1

Examples