[R] Upper bands and lower bands

[Pedro páramo]

Hi all

I want to add a band of fluctuación (exponential decreading) to a linear
deacrecing values

Imagine: I have a matrix like c(10,9,8,7,6,5,4,3,2,1)

The thing is I want  two new lines so that the máximum value of the new
colum on the máximum is from 10% to 5% higher and the same lower for the
mínimum

the final two matix will be something like

c(10+0.10*10,9+0.089*9,8+0.075*8.....,1+0.05*1)
c(10-0.10*10,9-0.09*9,8-0.075*8.....,1-0.05*1)

What I´m looking for is a function tu calculate de "values, weights" so
that including the 10% and 5% and the nunmber of decreasing values, in this
case n=10, calculates de smotth weigths.

I don´t know if I have expalined well so thar finally putting initial value
final and periods I can find a matrix like

g(0.1,0.89,0.79,0.075,...,0.05)

Exists something like that?

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