delts — differentiates a ts
tsout=delts(arg1[,arg2])
arg1 = the order of differenciation (optional, set to 1 if not provided, can be > 0, =0 or < 0) or a ts
arg2 = a time series if the first argument was set to the order of differentiation
tsout = the differenciated time series
if x is a ts: 1) y = delts(x) 2) y = delts(1,x) 3) y = delts(4,x) 4) y = delts(-3,x) The first 2 examples are equivalent: y is the result of the differenciation of x. The result of the third one is the ts y = x- x(-4) and the result of the fourth one is the ts = x - x(+3). Note that delts(2,x) is not the same as delts(delts(x)).