2.8.6 differentiate

Menu Information

Analysis: Mathematics: Differentiate

Brief Information

Calculate derivative of XY data

Additional Information

This feature is updated in 8.0 SR5. For more details, please refer to Release Notes.

Command Line Usage

1. differentiate iy:=Col(2);

2. differentiate iy:=(1, 2) order:=2 oy:=(3, 4);

3. differentiate iy:=(1,2) smooth:=1 poly:=2 npts:=20

X-Function Execution Options

Please refer to the page for additional option switches when accessing the x-function from script

Variables

Display Name	Variable Name	I/O and Type	Default Value	Description
Input	iy	Input XYRange	<active>	Specify the input XY range (curve) to perform differentiation.
Derivative Order	order	Input int	1	Specify the derivative order.
Smooth	smooth	Input int	0	Specify whether to use the Savitzky-Golay smoothing method that performs a local polynomial regression around each point to find the derivatives.
Polynomial Order	poly	Input int	2	This is available only when the smooth variable is set to 1. It specifies the polynomial order (1 to 9) for the Savitzky-Golay smoothing method.
Points of Window	npts	Input int	20	This is available only when the smooth variable is set to 1. It specifies the number of points in the moving window used in the Savitzky-Golay smoothing method.
Output	oy	Output XYRange	(<input>,<new>)	Specify the output range. See the syntax here.
Plot Derivative Curve	plot	Input int	0	Specify whether to plot the derivative curve.

Examples

This example shows you how to calculate the second derivative of a dataset:

1. Import the file <Origin Program Folder>\Samples\Spectroscopy\HiddenPeaks.dat.
2. Highlight col(B), and then select Analysis: Mathematics: Differentiate from the main menu to bring up the dialog box of the tool.
3. Enter 2 after Derivative Order
4. Click OK. A new column should be added to the worksheet. It has the results.

More Information

Please refer to this page in the User Guide for more information:

• Description
• Algorithm

Related X-Functions

integ1