# [ncl-talk] Sequences of values

Dennis Shea shea at ucar.edu
Fri Mar 23 16:17:10 MDT 2018

```Sorry, I'm I am not looking at any code.

tcrit = 30.

T = f->T                  ; (time,lat,lon)

[1] "setting values below the threshold to _FillValue" is simple.

https://www.ncl.ucar.edu/Document/Functions/Built-in/where.shtml

Tcrit = where(T.ge.tcrit, T, T at _FillValue)
copy_VarMeta(T, Tcrit)
===========
[2] You do not need to do [1]

Maybe you could use the following function:

=========
http://www.ncl.ucar.edu/Document/Functions/Built-in/dim_numrun_n.shtml
****Look at the examples****
=========

T10= where(T.ge.tcrit,1, 0)
T10 at long_name = "Exceed=1; No=0"
copy_VarCoords(T, T10)
printVarSummary(T10)

r0 = *dim_numrun_n* (T10, *0*, 0)  ; (ntim,nlat,mlon)
r1 = *dim_numrun_n* (T10, *1*, 0)
copy_VarCoords(T, r0)
copy_VarCoords(T, r1)

;---Pick one grid point to see what is happening

LAT = ..
LON = ..
print(T(:,{LAT},{LON})+"  "+Tcrit(:,{LAT},{LON})+"  "+T10(:,{LAT},{LON}) \
+"  "r0(:,{LAT},{LON})+"   "+r1(:,{LAT},{LON})

On Fri, Mar 23, 2018 at 3:29 PM, Kiswendsida Hyacinthe GUIGMA <
karongseba at gmail.com> wrote:

> Dear NCL users,
> I have 3D (time,lat,lon) array of temperature from which I would like to
> keep only sequences (consecutive days) exceeding a certain threshold.  This
> consist concretely in setting values below the threshold to _FillValue.
> The length of sequence is set to 4. So far,  have been able  to set to
> _FillValu only individual days that exceed the threshold. Then I would be
> pleased if you could provide me with a method to also set to _FillValue
> values that are not into sequences of at least 04 days.
>
> Please find attached my data and my code.
>
> Regards
>
>
> -----------------------------
> GUIGMA
>
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