[ncl-talk] Wondering Why I Get This Error

Fri Sep 8 02:57:18 MDT 2017

Good that it works. Where statement is a good function to be familiar with.

Is there a similar approach for adding two numbers to the array?

dbz = dbz*0.5 - 0.33

It depends on what you want to do. Are you again thinking element-wise? As it stands above, you are operating on the entire array.

Then the where statement will work:

Dbz = where(condition, dbz*0.5 - 0.33,dbz)

Someone else pointed out that wrap_around is byte. You cannot add a byte and a float, in many low-level languages you have to keep track of such things. Be careful when you coerce a type. Double check that the results is what you want and that there is minimal data loss. Otherwise you will introduce more strange things into your results.

/M

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Ward, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: Barry Lynn <barry.h.lynn at gmail.com>
Date: Friday, 8 September 2017 at 10:50
To: Marston Johnston <shejo284 at gmail.com>
Cc: ncl-talk <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] Wondering Why I Get This Error

The where statement did the trick for that problem -- thank you.

If you want to check the elements of an array of any dimension and replace that element with a scalar of the same type, then consider the where()

Statement:

Dbz = where(dbz.lt.0.0, dbz+256.0,dbz)

Is there a similar approach for adding two numbers to the array?

dbz = dbz*0.5 - 0.33

Thanks -- this should be the last of my questions abou this.

On Fri, Sep 8, 2017 at 11:46 AM, Marston Johnston <shejo284 at gmail.com> wrote:

Try the where() statement and then printout the meta data on all variables involved in the problem.

/M

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Ward, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: Barry Lynn <barry.h.lynn at gmail.com>
Date: Friday, 8 September 2017 at 10:44
To: Marston Johnston <shejo284 at gmail.com>
Cc: ncl-talk <ncl-talk at ucar.edu>
Subject: Re: [ncl-talk] Wondering Why I Get This Error

Of course I read the error statement.

I don't understand why I can add dbz (which is a 2 dimensional array) to a scalar value.  This is a pretty basic thing to do.

Moreover, when I defined "wrap_around" as dbz, and then set wrap_around to zero, I still can't coerce the variables.

fatal:["NclVar.c":1390]:Assignment type mismatch, right hand side can't be coerced to type of left hand side

fatal:["Execute.c":8575]:Execute: Error occurred at or near line 35 in file ./radar_2.ncl

Is the answer to this problem obvious? It seems to me that it should be, which I am (at the moment) frustrated. 

  wrap_around = dbz

  wrap_around = 256.

  do j = 0,dims2d(0)-1

  do i = 0,dims2d(1)-1

  check = ismissing(dbz(j,i))

   if (check.eq.False)then

   if (dbz(j,i).lt.0)then

    dbz(j,i) = dbz(j,i) + wrap_around(j,i)

   end if

   end if

  end do

  end do

On Fri, Sep 8, 2017 at 11:37 AM, Marston Johnston <shejo284 at gmail.com> wrote:

Again, read the error statement and try to understand what it is telling you:

atal:["NclVar.c":1390]:Assignment type mismatch, right hand side can't be coerced to type of left hand side

fatal:["Execute.c":8575]:Execute: Error occurred at or near line 35 in file ./ra

You have a TYPE mismatch between your variables and NCL cannot coerce one to the other. Make sure you are adding the same types of variables…

For example, you cannot do 1 + “help”, that would be a type mismatch!

/M

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

Marston S. Ward, PhD

Department of Earth Sciences

University of Gothenburg, Sweden

Email: marston.johnston at gu.se

SkypeID: marston.johnston 

Phone: +46-31-7864901 

Only the fruitful thing is true!

~~~~~~~~~~~~~~~~~~~~~~~~~~~~~

From: ncl-talk <ncl-talk-bounces at ucar.edu> on behalf of Barry Lynn <barry.h.lynn at gmail.com>
Date: Friday, 8 September 2017 at 10:11
To: ncl-talk <ncl-talk at ucar.edu>
Subject: [ncl-talk] Wondering Why I Get This Error

atal:["NclVar.c":1390]:Assignment type mismatch, right hand side can't be coerced to type of left hand side

fatal:["Execute.c":8575]:Execute: Error occurred at or near line 35 in file ./ra

-- 

Barry H. Lynn, Ph.D

Senior Lecturer,

The Institute of the Earth Science, 
The Hebrew University of Jerusalem, 
Givat Ram, Jerusalem 91904, Israel 

Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108

-- 

Barry H. Lynn, Ph.D

Senior Lecturer,

The Institute of the Earth Science, 
The Hebrew University of Jerusalem, 
Givat Ram, Jerusalem 91904, Israel 

Tel: 972 547 231 170
Fax: (972)-25662581

C.E.O, Weather It Is, LTD
Weather and Climate Focus
http://weather-it-is.com
Jerusalem, Israel
Local: 02 930 9525
Cell: 054 7 231 170
Int-IS: x972 2 930 9525
US 914 432 3108

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