Re: [ferret_users] running sum with restart after a missing value

[Ryo Furue <furue@xxxxxxxxxx>]

Hi Thomas,

I would like to calculate a running sum over multiple time step, which however restarts after a missing value.

That behavior seems to me to be inconsistent; that is, @SUM skips missing values and gives a sum of valid values, whereas @RSUM stops when it finds a missing value.

Is there a simple solutions in ferret?

If you just want to skip the missing values in your running sum, you want to assign zeros to them. This is a contrived, simple example:

let var = TSEQUENCE({1,2,-1.0e34,4,5,6})

let var2 = ifv var then var else 0

plot/line/symbol var2[t=@RSUM], var[t=@RSUM]

Hope this helps.

Ryo