com.hissain.jscipy.signal.filter

Class SavitzkyGolay

java.lang.Object

com.hissain.jscipy.signal.filter.SavitzkyGolay

public class SavitzkyGolay
extends java.lang.Object

Implements Savitzky-Golay filter for data smoothing and differentiation. Based on the method described in Numerical Recipes and SciPy's implementation.

Constructor Summary

Constructors

Constructor and Description
SavitzkyGolay()

Method Summary

Modifier and Type	Method and Description
double[]	savgol_filter(double[] x, int windowLength, int polyOrder) Applies a Savitzky-Golay filter to an array (smoothing, derivative=0).
double[]	savgol_filter(double[] x, int windowLength, int polyOrder, int deriv, double delta) Applies a Savitzky-Golay filter to an array.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

SavitzkyGolay

public SavitzkyGolay()

Method Detail

savgol_filter

public double[] savgol_filter(double[] x,
                              int windowLength,
                              int polyOrder,
                              int deriv,
                              double delta)

Applies a Savitzky-Golay filter to an array.

Parameters:

x - The data to be filtered.

windowLength - The length of the filter window (i.e., the number of coefficients). window_length must be a positive odd integer.

polyOrder - The order of the polynomial used to fit the samples. polyorder must be less than window_length.

deriv - The order of the derivative to compute. This must be a non-negative integer. The default is 0, which means to filter the data without differentiating.

delta - The spacing of the samples to which the data will be applied. This is only used if deriv > 0. Default is 1.0.

Returns:

The filtered data.

savgol_filter

public double[] savgol_filter(double[] x,
                              int windowLength,
                              int polyOrder)

Applies a Savitzky-Golay filter to an array (smoothing, derivative=0).

Parameters:

x - The data to be filtered.

windowLength - The length of the filter window.

polyOrder - The order of the polynomial.

Returns:

The filtered (smoothed) data.