multipol (version 1.0-7)

deriv: Partial differentitation

Description

Partial differentiation with respect to any variable

Usage

# S3 method for multipol
deriv(expr, i, derivative = 1, ...)

Arguments

expr

A multipol

i

Dimension to differentiate with respect to

derivative

How many times to differentiate

...

Further arguments, currently ignored

Author

Robin K. S. Hankin

See Also

substitute

Examples

a <- as.multipol(matrix(1:12,3,4))

deriv(a,1)     # standard usage: derivfferentiate WRT x1
deriv(a,2)     # differentiate WRT x2

deriv(a,1,2)   # second derivative
deriv(a,1,3)   # third derivative (zero multipol)