# [R] Upper bands and lower bands

Pedro páramo percentil101 at gmail.com
Thu Jun 1 22:20:42 CEST 2017

```I explain better:

I have this percentage z<-1/(n*365) where n=20 so z is
0,000136986

Imagine: a matrix with length(n*365) so that

matrix result is

resultc(
1,
1-z
result previous row-z
result previous row-z
....
0)

If I plot this is a linear decreasing line

I want to plot an upper line wich is 10% higher tan resultc on the first
values and then decreasing so that last value will be 0.05.
the same in the lower, a line which values are at the beggining a 10%
lower and smoothly dreasing values till the last will be 5% lower.

Is it posible to make thins bands exponencially with a code?

2017-06-01 20:20 GMT+02:00 Pedro páramo <percentil101 at gmail.com>:

> 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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