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Differentiate macro command

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Macro commands may be used either in macros or by sending the commands to DPlot via dynamic data exchange (DDE). Some commands are valid only in macros (noted by Macros Only). Commands sent to DPlot via DDE must be enclosed by square brackets [     ]. Macro commands should not include the brackets.

Command parameters shown in the descriptions below are placeholders for the actual values. Command parameters are either numeric values, equations that evaluate to numbers, or character strings. Character string parameters are always bound by double quotation marks. Equations must be preceded by an equals sign (=).

The pipe symbol (|) in the command syntax indicates that a parameter is optional, and should not be included in your macro unless otherwise noted.

All indices into arrays are 1-based, e.g. Curve1=1 refers to the first curve in a plot.

A 0x prefix for numbers in the descriptions below indicates hexadecimal notation; e.g. 0x0010 = 16.

JR/Viewer indicates that the command is supported by DPlot Jr or DPlot Viewer.
JR/Viewer indicates that the command is NOT supported by DPlot Jr or DPlot Viewer.



JR   Viewer

Differentiates (finds y/x) the curve or curves selected with the SelectCurve command. Both method and replace are optional. Use method=1 for the Central difference method, =2 for Quadratic interpolation, or =3 for the Previous point method. If method=2 and the source curve does not have evenly-spaced points, method=1 will be used instead. If method is omitted, then Quadratic interpolation is used for evenly-spaced points and Central difference is used otherwise.

Set replace to a non-zero value to replace the source curve with the result of this function, or 0 to create a new curve. Default (omitted) = 0.


See also

Differentiate a Curve menu command


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