[ncl-talk] Get two different results from Matlab and NCL

[Dennis Shea]

As has been mentioned many times on ncl-talk. The golden rule of data
processing is *look at your data*. ("examine your data"!!!)

If you had done so, you would have seen that the source array had
90361 missing values (_FillValue).


[1]
Matlab must silently interpolate/extrapolate to these values. I am not
sure that I would consider that a good thing.

[2]
NCL can interp/extrapolate also. However, the user must explicitly
invoke the interpolation procedures. At least the user knows what type
of interpolation has been used.



On Mon, Nov 9, 2015 at 4:03 PM, Wang, Chao <cxw151530 at utdallas.edu> wrote:
> Dear Sir/Madam,
>
> I have used the data downloaded from GFS to make the wind field. But I got
> two different results from Matlab and NCL. For example, there are two blanks
> in this map of NCL: one is on Greenland, the other is China. But in Matlab,
> the result is different. I don’t know whether is there any problem about my
> NCL codes? I really need your help! Thank you very much!
>
> Here is the link to GFS data:
> https://www.dropbox.com/s/8lombeolk4kr7ml/gfs.t18z.pgrb2.0p25.f024?dl=0
> Here is the link to MATLAB result:
> https://www.dropbox.com/s/j8h8u6249q97rw2/Wind-1829m.fig?dl=0
> Here is the NCL script:
>
> _______________________________________________
> ncl-talk mailing list
> ncl-talk at ucar.edu
> List instructions, subscriber options, unsubscribe:
> http://mailman.ucar.edu/mailman/listinfo/ncl-talk
>
-------------- next part --------------
A non-text attachment was scrubbed...
Name: WindVelocity.ncl
Type: application/octet-stream
Size: 1229 bytes
Desc: not available
Url : http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20151109/d1983085/attachment-0001.obj 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: vector2b.000001.png
Type: image/png
Size: 161975 bytes
Desc: not available
Url : http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20151109/d1983085/attachment-0002.png 
-------------- next part --------------
A non-text attachment was scrubbed...
Name: vector2b.000002.png
Type: image/png
Size: 168801 bytes
Desc: not available
Url : http://mailman.ucar.edu/pipermail/ncl-talk/attachments/20151109/d1983085/attachment-0003.png