DERIV
Syntax | Return Value | Arguments | Examples | Version History | See Also
The DERIV function performs numerical differentiation using 3-point, Lagrangian interpolation.
This routine is written in the IDL language. Its source code can be found in the file deriv.pro in the lib subdirectory of the IDL distribution.
Syntax
Result = DERIV([X,] Y)
Return Value
Returns the derivative of the numerical differentiation.
Arguments
X
Differentiate with respect to this variable. If omitted, unit spacing for Y (i.e., Xi = i) is assumed.
Y
The variable to be differentiated.
Examples
X = [ 0.1, 0.3, 0.4, 0.7, 0.9]
Y = [ 1.2, 2.3, 3.2, 4.4, 6.6]
PRINT, DERIV(Y)
PRINT, DERIV(X,Y)
IDL prints:
Version History
