Partial differentiation with respect to any variable
## S3 method for class 'multipol'
deriv(expr, i, derivative = 1, ...)
Dimension to differentiate with respect to
How many times to differentiate
Further arguments, currently ignored
Robin K. S. Hankin
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)
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