[ncl-talk] Error subscript when using indices output from dim_pqsort to reorder another array
YAN HUIPING
yanhp2009 at gmail.com
Fri May 29 13:48:36 MDT 2020
Hi Rashed,
I am very appreciated for your reply.
Yes, I am try to reorder the 4-D array and the 2-D array is a simple example to show the problem.
What I am done here is sorting the data in vertical, i.e. from the bottom surface to the top. Since the pressure in vertical is decreasing while the temperature may be not, I could not simply use the dim_pqsort_n to reorder the temperature (Y) as the pressure array (X). That’s why I have to use the indices from the pressure (X here) to reorder the temperature (Y).
Actually, I have used several loops to do such reordering and solved my own problems. But I think this function may need some improvements.
Thanks,
Huiping
> On May 29, 2020, at 5:42 PM, Rashed Mahmood <rashidcomsis at gmail.com> wrote:
>
> Hi Huiping,
> I think in this case the following should work, note that your ip variable has dimensions [2,3] as you can see from the print statements:
>
> y(0,:)=y(0,ip(0,:))
> y(1,:)=y(1,ip(1,:))
>
> However, I guess this is not what you are trying to do for your original array of (time,nlat,nlon,nlev)?
> If, for example "data" is a variable name with sizes (ntime,nlat,nlon,nlev) and you want to sort out according to time dimension, you can do something as:
> data_new = dim_pqsort_n(data,-2,0) ; read documentation about the option -2
> NOTE that this will sort out your "data" variable in decreasing order.
> See the documentation for different of sorting in descending/ascending order.
> https://www.ncl.ucar.edu/Document/Functions/Built-in/dim_pqsort_n.shtml <https://www.ncl.ucar.edu/Document/Functions/Built-in/dim_pqsort_n.shtml>
>
> hope that helps,
> Cheers,
> Rashed
>
>
>
>
>
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>
> On Thu, May 28, 2020 at 3:49 PM YAN HUIPING via ncl-talk <ncl-talk at ucar.edu <mailto:ncl-talk at ucar.edu>> wrote:
> Thank you Laura, I tried, but it does not help.
> and just now I created a simple script like the example of the function dim_pqsort ,and it came out the same errors.
>
> “ fatal:Illegal subscript. Subscripts must be scalar or one dimensional vectors
>
> fatal:["Execute.c":8637]:Execute: Error occurred at or near line 12 in file test.ncl"
>
> =========================================
>
> begin
>
> x=(/(/2,1,3/),(/4,6,5/)/)
> printVarSummary(x)
> print(x)
> ip=dim_pqsort(x,-2)
> print(x)
>
> printVarSummary(ip)
>
> y=(/(/2,1,3/),(/4,6,5/)/)
> y=y(ip,:)
>
> print(y)
> end
>
>
>
>> On May 29, 2020, at 6:35 AM, Laura Fowler <laura at ucar.edu <mailto:laura at ucar.edu>> wrote:
>>
>> Hi Huiping:
>> may be you need to add delete(TTnew) before the line:
>>
>> delete(TTnew)
>> TTnew=y(ip,:,:,:);
>> printMinMax(TTnew,0)
>>
>> since TTnew is originally a 4-dimensional array.
>> Laura
>>
>>
>>
>>
>> On Thu, May 28, 2020 at 4:23 PM YAN HUIPING via ncl-talk <ncl-talk at ucar.edu <mailto:ncl-talk at ucar.edu>> wrote:
>> Hi,
>> I post the message
>>
>>
>> the ncl script:
>>
>> ==========================================
>> x=PPnew
>> print(num(ismissing(x)))
>> y=TTnew
>> ip=dim_pqsort_n(x,-2,3)
>> printVarSummary(x)
>> printVarSummary(ip)
>> printMinMax(ip,0)
>> print(dimsizes(ip))
>>
>> TTnew=y(ip,:,:,:);
>> printMinMax(TTnew,0)
>> =========================================
>>
>> (0) missing number 0
>>
>> Variable: x
>> Type: float
>> Total Size: 31948800 bytes
>> 7987200 values
>> Number of Dimensions: 4
>> Dimensions and sizes: [time | 12] x [lat | 160] x [lon | 320] x [LEV | 13]
>> Coordinates:
>> time: [20160116.875..20161216.875]
>> lat: [89.14151942646112..-89.14151942646112]
>> lon: [ 0..358.875]
>> LEV: [107500..5000]
>> Number Of Attributes: 7
>> _FillValue : 1e+20
>> institution : MPIMET
>> cell_methods : time: mean
>> table : 128
>> code : 130
>> units : K
>> long_name : pressure
>>
>> Variable: ip
>> Type: integer
>> Total Size: 31948800 bytes
>> 7987200 values
>> Number of Dimensions: 4
>> Dimensions and sizes: [12] x [160] x [320] x [13]
>> Coordinates:
>> (0) min=0 max=12
>> (0) 12
>> (1) 160
>> (2) 320
>> (3) 13
>> fatal:Illegal subscript. Subscripts must be scalar or one dimensional vectors
>>
>> ====================
>>
>> Y has the same dimensions as X ([time | 12] x [lat | 160] x [lon | 320] x [LEV | 13]). And there is no missing value in X, but Y has some.
>>
>>
>> Thus, I think there are some bugs here. Could you please help me look into it?
>>
>> Thanks,
>> Huiping
>>
>>
>>> On May 29, 2020, at 1:21 AM, Dennis Shea <shea at ucar.edu <mailto:shea at ucar.edu>> wrote:
>>>
>>> Whenever you encounter an error, you should add print statements to help you debug the issue.
>>>
>>> printVarSummary(x) ; overview of source variable
>>> print("-----") ; visual break
>>>
>>> ip = dim_pqsort(x,-2) ;; descending order
>>> printVarSummary(ip)
>>> prinyMinMax(ip, 0)
>>> print("-----")
>>>
>>> dim_ip = dimsizes(ip)
>>> print(dim_ip)
>>> print("-----")
>>>
>>> y=y(ip,:,:,:)
>>> =============================
>>> Are there grid locations that contain all missing values?
>>>
>>>
>>>
>>> On Tue, May 26, 2020 at 6:36 PM YAN HUIPING via ncl-talk <ncl-talk at ucar.edu <mailto:ncl-talk at ucar.edu>> wrote:
>>> Hi,
>>> I am using the function dim_pqsort to reorder an array with dimensions of (time,nlat, nlon, nlev) following the instructions https://www.ncl.ucar.edu/Document/Functions/Built-in/dim_pqsort.shtml <https://www.ncl.ucar.edu/Document/Functions/Built-in/dim_pqsort.shtml>
>>>
>>> ip=dim_pqsort(x,-2);; descending order
>>> y=y(ip,:,:,:)
>>>
>>> However, there are error messages: “fatal:Illegal subscript. Subscripts must be scalar or one dimensional vectors”.
>>> Ps: the version of NCL I used is 6.5.0
>>>
>>> Could please help me on this problem?
>>>
>>> Thanks,
>>> Huiping
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>> --
>> !-------------------------------------------------------------------------------------------------------------
>> Laura D. Fowler
>> Mesoscale and Microscale Meteorology Division (MMM)
>> National Center for Atmospheric Research
>> P.O. Box 3000, Boulder CO 80307-3000
>>
>> e-mail: laura at ucar.edu <mailto:laura at ucar.edu>
>> phone: 303-497-1628
>>
>> !-------------------------------------------------------------------------------------------------------------
>
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