[ncl-talk] Question about regressing a time series and a gridded data using regCoef_n

[Lyndon Mark Olaguera]

Dear Sir Will and NCL experts,

I still get the same error *(fatal:where: dimension sizes  of parameter 0
and parameter 2 do not match)*. I am not sure if I am implementing this
correctly.

I changed this part in my code based on the suggestion suggestion:

;****************************************************
;Test for significance
;****************************************************
 df = rc at nptxy-2                 ; degrees of freedom
 tval = rc at tval                  ; t-statistic
 b = tval                        ; b must be same size as tval (and df)
 b = 0.5
 prob = betainc(df/(df+tval^2),df/2.0,b)
 printVarSummary(prob);dim=1 size=64800

* prob_test =onedtond(prob,(/2,64800/))*
* printVarSummary(prob_test)*

 rc95 = where(prob_test.lt.0.95,rc at _FillValue,rc)
 copy_VarCoords(rc, rc95)
 printVarSummary(rc95)


I'll appreciate any suggestion on how I can do this correctly.

Sincerely,

*Lyndz*

On Thu, Jun 22, 2017 at 3:34 PM, Will Hobbs <will.hobbs at utas.edu.au> wrote:

> Change the dimensions of ‘prob’ so that it matches the dimensions of rc.
>
>
>
> You can do this using the onedtond() function; you’ll find a complete
> description of this function on the NCL web page.
>
>
>
> Will
>
>
>
> *From: *<ncl-talk-bounces at ucar.edu> on behalf of Lyndon Mark Olaguera <
> olagueralyndonmark429 at gmail.com>
> *Date: *Thursday, 22 June 2017 at 4:28 PM
> *To: *"ncl-talk at ucar.edu" <ncl-talk at ucar.edu>
> *Subject: *[ncl-talk] Question about regressing a time series and a
> gridded data using regCoef_n
>
>
>
> Dear NCL experts,
>
>
>
> I am trying to calculate the linear regression coefficient between a
> single time series and a gridded sst using the regCoef_n in ncl. I am using
> ncl v.6.4.
>
>
>
> Attached is my script and the text file that I am regressing. Here is the
> link to the sst data:
>
>
>
> [Link to the data]
>
> https://drive.google.com/file/d/0B9faET7Bc2o8TjNSWnd1ODREcVU/
> view?usp=sharing
>
>
>
> What I wanted to do:
>
>
>
> 1. I want to extract and plot significant coefficients (above 95%
> confidence level), so I have this line in the script:
>
>
>
>  df = rc at nptxy-2 ; degrees of freedom
>
>  tval = rc at tval ; t-statistic
>
>  b = tval ; b must be same size as tval (and df)
>
>  b = 0.5
>
> * prob = betainc(df/(df+tval^2),df/2.0,b) *
>
> * rc95 = where(prob.lt.0.95,rc at _FillValue,rc)*
>
>
>
> I encountered an error after this:
>
>
>
> *fatal:where: condition variable (parameter 0) dimension mismatch with
> parameter 2*
>
>
>
> I understand that the *"prob"* variable has only one dimension and the "
> *rc"* has 2 dimensions (lat & lon).
>
>
>
> Is it possible to assign coordinates to "prob" similar to "rc" other than
> the copyVarCoords?
>
>
>
>
>
> I'll appreciate any suggestions on how to do this correctly.
>
>
>
>
>
> Sincerely,
>
>
>
> Lyndz
>
>
>
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