[ncl-talk] running sequence of 0s and 1s [SEC=UNCLASSIFIED]

[Griffith Young]

Hello Peter,

Not if you go to the casino and are doubling up your bet.

This code seems to work...

v = {vector or array of 1's and 0's}
c = v
t = 0
do i = 0, dimsizes(v) - 1
    if v(i) .eq. 0 then
        c(i) = 0
        t = 0
    end if
    if (v(i) .eq. 1) then
        c(i) = t
        t = t + 1
    end if
end do

Caveat: "Since NCL is an interpreted language, it is best to avoid do loops as much as possible. They can cause considerable slow downs. Small loops should not be a problem."

Regards, Griff.


From: ncl-talk-bounces at ucar.edu [mailto:ncl-talk-bounces at ucar.edu] On Behalf Of Dennis Shea
Sent: Wednesday, 8 March 2017 2:59 PM
To: Peter Gibson
Cc: ncl-talk at ucar.edu
Subject: Re: [ncl-talk] running sequence of 0s and 1s

Sorry, no. Pretty specialized function ...
: 0 0 0 1 1 0 1 1 1 1 1 0 1 1 1 0 ...  input: 1st 1 is a flag
: 0 0 0 0 1 0 0 1 2 3 4 0 0 1 2 0

On Tue, Mar 7, 2017 at 8:17 PM, Peter Gibson <peter.gibson at unsw.edu.au<mailto:peter.gibson at unsw.edu.au>> wrote:
Hello,

Is there a function to calculate the running length of 0/1s in a sequence in NCL?

for example if I had a vector     v : 0 0 0 1 1 0 1 1 1 1 1 0 1 1 1 0 ...
the running sequence would be   : 0 0 0 0 1 0 0 1 2 3 4 0 0 1 2 0 ...

I see the function dim_numrun counts the number of unique sequence lengths which is similar but not exactly what I am after ....



Thanks,

Peter

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