[ncl-talk] (Error:conform) Weighting observations before applying EOF

[Mary Haley]

Hi Lyndon,

I think the problem is simply that "conform" is not being used correctly.
The error is giving you a hint as to what the problem is:

*fatal:conform: the dimensions sizes of the second argument do not match
those indicated by the third argument*

The way conform works is that the first argument represents an array that
you want to conform a smaller array (the second argument) to. The third
argument must be a list of dimension indexes where the dimensions of the
small array match the larger array.

For example, if you have a 3D array (arr3d) of size 10 x 20 x 30, and a 1D
array (arr1d) of size 20 that you want to expand to the size of arr3d, then
the dimension index you need to use is 1 (dimension numbering starts at 0):

  arr1d_expand = conform(arr3d,arr1d,1)

Or, if you have a 2D array of size 10 x 30 then the dimension indexes would
be (/0,2/):

arr2d_expand = conform(arr3d,arr2d,(/0,2/))

In your case, you are trying to copy a 1D array of latitudes to a larger
array, and using "1" as your dimension index. However, y is dimensioned lat
x lon x time, so you should be using "0" as the dimension index:

   pw     = y*conform(y, clat, 0)

As for your second question, if you are asking how to create an XY plot
with multiple curves, then see our XY plotting page:

http://www.ncl.ucar.edu/Applications/xy.shtml

To get "nice" time labels on the X axis, you can use the "time_axis_labels"
function. See:

http://www.ncl.ucar.edu/Applications/time_labels.shtml

--Mary




On Fri, Feb 10, 2017 at 2:01 AM, Lyndon Mark Olaguera <
olagueralyndonmark429 at gmail.com> wrote:

> Dear fellow NCL users,
>
> I am trying to perform an EOF analysis on daily olr anomalies. I tried to
> extract the values of eof_ts but they are very large (-100 to 100). Based
> from the documentation (http://www.ncl.ucar.edu/Document/Functions/
> Contributed/eofunc_Wrap.shtml), the values should be weighted first.
> Attached is the script that I am using.
>
> Here is the link to the data:
>
> [Link to the anomalies] https://drive.google.com/file/
> d/0B9faET7Bc2o8eHZKSi1qX3JLeFU/view?usp=sharing
>
> [Link to the raw data] https://drive.google.com
> /file/d/0B9faET7Bc2o8RjhGM2E1Ni1MTVU/view?usp=sharing
>
> I encountered the following errors:
>
> *fatal:conform: the dimensions sizes of the second argument do not match
> those indicated by the third argument*
>
> This part of the code is the problem.
>
>   rad    = 4.*atan(1.)/180.
>   clat   = f->lat
>   clat   = sqrt( cos(rad*clat) )
> ;************************************************
> ;Weight all observation
> ;************************************************
>   pw     = y
>  * pw     = y*conform(y, clat, 1)*
>
>   xw     = pw({lat|latS:latN},{lon|lonL:lonR},time|:)
>
>   eof    = eofunc_Wrap(xw,neof, False)
>   eof_ts = eofunc_ts_Wrap(xw,eof,False)
>
>
> Also, I would like to plot a similar figure attached to this mail. The
> attached figure is Amplitude of the PC's (y axis) versus the days (x) axis
> averaged from 1979-1992.
>
> Any suggestion on how can I do this correctly?
> I'll appreciate any help.
>
>
> Sincerely,
>
> Lyndon
>
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