[ncl-talk] specx_ci error if applied for a vector

[Dennis Shea]

The 'specx_anal' returns a *scalar* [degrees of freedom] and multiple
attributes including the spectrum ( spc[*] ).

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

Each iteration of your loop *overwrites* the previous iteration's
attributes. Please do a 'printVarSummary' after the loop

spec=new((/nn,64/),"double")             ; wrong
do ii=0,nn(0)-1
      spec(ii,:) = specx_anal(indextotal(ii,:),d,sm,pct)
end do

----
A taper of 0.7 means 70% of the values will be tapered. That is extremely
large. Usually, taper ~ 0.1
Maybe

maxconf=0.95
minconf=0.05
d = 0
sm = 3
pct = 0.10
do ii=0,nn-1
      sdof= specx_anal(indextotal(ii,:),d,sm,pct)

       xx=specx_ci(sdof,minconf,maxconf)

       ;plot or whatever
end do

===
https://www.ncl.ucar.edu/Document/Functions/Shea_util/specx_ci.shtml

is prototyped as:

function specx_ci (
		sdof     : numeric,
		lowval   : numeric,
		highval  : numeric
	)


That should be

function specx_ci (
		sdof[1]  : numeric,           <=== scalar
		lowval   : numeric,
		highval  : numeric
	)


 Good luck

On Tue, Oct 31, 2017 at 8:00 AM, Ioana Colfescu <ioana.colfescu at ncas.ac.uk>
wrote:

> Hi,
> I'm trying to use specx_ci for a vector of values that are the output of
> specx_anal.
> If I do it individually ( for every vector component) it works but when I
> do try to apply it for the entire vector I get the following error.
>
> fatal:chiinv: The two input arrays must have the same dimension sizes
>
> Can anyone tell me how to fix this and what's going on ?
> My code is below and the part where I get the error from is in red.
> Thanks.
>
> begin
> amo = addfile("int_ext_AMO_anom.1871-1998.nc","r")
> index0=amo->AMO_Cext
> index1=amo->AMO_C1int
> index2=amo->AMO_C2int
> index3=amo->AMO_C3int
> index4=amo->AMO_C4int
> indextotal=(/index0,index1,index2,index3,index4/)
> nn=dimsizes(indextotal)
> ;*************
> d = 0
> sm = 3
> pct = 0.70
>
> spec=new((/nn(0),64/),"double")
> do ii=0,nn(0)-1
> spec(ii,:) = specx_anal(indextotal(ii,:),d,sm,pct)
> end do
>
> maxconf=0.95
> minconf=0.05
> printVarSummary(spec)
> xx=specx_ci(spec(0,:),minconf,maxconf)
>
>
>
> *Ioana Colfescu  *
> Research Scientist
> National Centre for Atmospheric Science
> School of Earth and Environment
> University of Leeds
>
>
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