[gradsusr] How to define this formula?

T. haghroosta haghroosta at hotmail.com
Sun Feb 3 14:44:16 EST 2013 

Dear Jeff, I did a little change, but it didn't work again. In fact, I didn't get what you mean exactely. The errors I got are :  Define error: invalid expressionclose error: only the last file may be closederror from pow: too many or two few arguments                        two arguments expectedoperation error: error from pow function                        error from sqrt function  t=1
pow=0
'reinit'
while(t<=4)
'sdfopen file1.nc'
lon1= 100
lat1= 21
TK.1= TK
'close 1'
'open file2.ctl'
TK.2= TK
'pow1 = pow((TK.1-TK.2))'
'pow = pow + pow1'
t=t+1
endwhile
'RMSE= sqrt(pow/t)'

 How can I also show the RMSE value on the screen? Regards,

T.
  
> 
> Today's Topics:
> 
>    1. Re: How to define this formula? (Jeff Duda)
> 
> 
> ----------------------------------------------------------------------
> 
> Message: 1
> Date: Sun, 3 Feb 2013 12:29:00 -0600
> From: Jeff Duda <jeffduda319 at gmail.com>
> Subject: Re: [gradsusr] How to define this formula?
> To: GrADS Users Forum <gradsusr at gradsusr.org>
> Message-ID:
> 	<CAAig09DMieY67G5iX33RA-uy_he_ZYVXwwcB3qqqOTktvt4ZrQ at mail.gmail.com>
> Content-Type: text/plain; charset="iso-8859-1"
> 
> T.,
> Whenever you have multiple files open simultaneously, you need to use a .n
> appended to the variable name to reference the file.  It seems in your
> case, the variable in the second file is also TK, but you would need to
> refer to it as TK.2.  Also, you have open statements in your while loop,
> but no close statements.  Thus you will continue to open new files that
> will need successively higher reference numbers (.3, .4, etc).  Either use
> an index variable outside of quotes as the reference OR close each file at
> the end of each iteration of the loop.  Finally, remember to enclose
> statements in quotes if you would enter them at the Grads command prompt
> (like setting lat and lon values).
> 
> Jeff
> 
> On Sun, Feb 3, 2013 at 12:14 PM, T. haghroosta <haghroosta at hotmail.com>wrote:
> 
> >  Dear Jeff Duda,
> >
> > I did your suggestion as follows. As an extra explanation, I would like to
> > calculate RMSE for a special parameter like TK during four days in a
> > special Lon and Lat. I also have two files, observed and simulated. So, I
> > wrote this script, but it didn't work. Could you please help me? Another
> > question how can I show the last output (RMSE)?
> >
> >  t=1
> > pow=0
> > 'reinit'
> > while(t<=4)
> > 'sdfopen observed.nc'
> > lon= 100
> > lat= 21
> > TK1=TK
> > 'close 1'
> > 'open simulated.ctl'
> > TK2=TK
> > 'pow1=pow(TK1(t)-TK2(t))
> > 'pow = pow + pow1
> > t=t+1
> > endwhile
> > 'RMSE= sqrt(pow/t)'
> >
> >  Regards,
> >
> > T.
> >
> >
> >
> > >
> > > Today's Topics:
> > >
> > > 1. How to define this formula? (T. haghroosta)
> > > 2. Re: How to define this formula? (Jeff Duda)
> > > 3. Re: lon lat to km (wendi harjupa)
> > >
> > >
> > > --------------------------------------------------------------! --------
> > >
> > > Message: 1
> > > Date: Sun, 3 Feb 2013 05:24:48 +0000
> > > From: "T. haghroosta" <haghroosta at hotmail.com>
> > > Subject: [gradsusr] How to define this formula?
> > > To: <gradsusr at gradsusr.org>
> > > Message-ID: <DUB121-W214D8BDEBA3D102D60AD37DD020 at phx.gbl>
> > > Content-Type: text/plain; charset="windows-1256"
> >
> > >
> > >
> > >
> > >
> > >
> > > Dear All, Could you please tell me how can I define this equation which
> > I have attached to the email. I got confused completely, I did somethings
> > that don't work.
> > >
> > > Regards, T.
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > >
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> > >
> > > ------------------------------
> > >
> > > Message: 2
> > > Date: Sun, 3 Feb 2013 01:53:22 -0600
> > > From: Jeff Duda <jeffduda319 at gmail.com>
> > > Subject: Re: [gradsusr] How to define this formula?
> > > To: GrADS Users Forum <gradsusr at gradsusr.org>
> > > Message-ID:
> > > <CAAig09DhORYVv_MLG58R5SEAv9pypU41igt_7XwYt97v9Ljocw at mail.gmail.com>
> > > Content-Type: text/plain; charset="iso-8859-1"
> >
> > >
> > > That looks like standard deviation or RMSE. Either way, assume your array
> > > is VAR. Then it's
> > >
> > > C = sqrt(amean(asum(pow(VAR -
> > > amean(VAR,x=x1,x=x2,y=y1,y=y2)),2),x=x1,x=x2,y=y1,y=y2))
> > >
> > > OR
> > >
> > > C = sqrt(asum(V! AR - amean(VAR,x=x1,x=x2,y=y1,y=y2))/N), where N is the
> >
> > > number of grid points over which you're summing.
> > >
> > > You'll have to insert values for x1, x2, y1, and y2 yourself. You can use
> > > lat and lon instead of y and x, though.
> > >
> > > If that fails, try breaking it into parts:
> > > 'average = amean(VAR,x=x1,x=x2,y=y1,y=y2)'
> > > 'diffsquaredsum = asum(pow(VAR-average,2),x=x1,x=x2,y=y1,y=y2)'
> > > 'SD (or) RMSE = sqrt(diffsquaredsum/N)'
> > >
> > > Jeff Duda
> > >
> > > On Sat, Feb 2, 2013 at 11:24 PM, T. haghroosta <haghroosta at hotmail.com
> > >wrote:
> > >
> > > > Dear All,
> > > >
> > > > Could you please tell me how can I define this equation which I have
> > > > attached to the email. I got confused completely, I did somethings that
> > > > don't work.
> > > >
> > > > Regards,
> > > >
> > > > T.
> > > >
> > > > **** ** ** ** ** ** ** ** ** ** ** ** ** ** ** *!
> > *************************
> > > > ** **** ********
> > > >*> > _______________________________________________
> >
> > > > gradsusr mailing list
> > > > gradsusr at gradsusr.org
> > > > http://gradsusr.org/mailman/listinfo/gradsusr
> > > >
> > > >
> > >
> > >
> > > --
> > > Jeff Duda
> > > Graduate research assistant
> > > University of Oklahoma School of Meteorology
> > > Center for Analysis and Prediction of Storms
> > > -------------- next part --------------
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> > >
> > > ------------------------------
> > >
> > > Message: 3
> > > Date: Sun, 3 Feb 2013 21:55:53 +0900
> > > From: wendi harjupa <wendiharjupa at gmail.com>
> > > Subject: Re: [gradsusr] lon lat to km
> > > To: GrADS Users Forum <gradsusr at gradsusr.org>
> > > Message-ID:
> > > <CA+u6P9METKDdi6QQkH-FZT7mMzcFSAR17MeuvY-hiOkwYQn6Ow at mail.gmail.com>!
> > > Content-Type: text/plain; charset="iso-8859-1"
> > >
> > > Dear Mr. Jeff
> > >
> > > Thank you very much for your guidance as far..
> > > But, I am very sorry for asking you many times..
> > > since it is very difficult for me..
> > >
> > > I tried to change some parts of script, but still this did not run..
> > > I got error message as below :
> > >
> > > Error from CDIFF: Specified dimension non varying
> > > Operation Error: Error from cdiff function
> > > Error ocurred at column 31
> > > DEFINE error: Invalid expression.
> > > *** glibc detected *** grads: corrupted double-linked list: 0x089e2918
> > > ***
> > > Would you mind to explain more??
> > >
> > > Thank you very much
> > >
> > > Best regards,
> > > wendi
> > >
> > > On Sun, Feb 3, 2013 at 1:46 AM, Jeff Duda <jeffduda319 at gmail.com> wrote:
> > >
> > > > Use this code:
> > > >
> > > > 'reinit'
> > > > 'open try2.ctl'!
> > > > 'set grads off'
> > > > 'set mproj latlon'
> > > > 'set mpdset hires'
> > > > 'set gxout shaded'
> > > > 'set grid on'
> > > > 'set lon 100 101'
> > > > 'set lat -1 0'
> > > > 'define dx =
> > *6.371e3**cos(-1*(3.14159/180))*cdiff(100,0)*(3.14159/180)'
> > > > 'define dy = *6.371e3**cdiff(-1,0)*(3.14159/180))'
> > > > 'define xdist = ((lon-100)/0.004492369)*(dx/2)'
> > > > 'define ydist = ((lat-0)/0.004522556)*(dy/2)'
> > > > 'set z 5'
> > > > 'set t 1'
> > > > 'd ref'
> > > >
> > > > The square brackets were just to show different groupings. When it
> > comes
> > > > time to code it, you must use only parentheses.
> > > >
> > > > The above should work.
> > > >
> > > > Jeff
> > > >
> > > > On Sat, Feb 2, 2013 at 1:41 AM, wendi harjupa <wendiharjupa at gmail.com
> > >wrote:
> > > >
> > > >> Dear Mr. Jeff
> > > >>
> > > >> Thank you very much for your explanation,
> > > >> but I am very sorry, ! I still do not get it,
> > > >>
> > > >> I made new script
> > > >>
> > > >> 'reinit'
> > > >> 'open try2.ctl'
> > > >> 'set grads off'
> > > >> 'set mproj latlon'
> > > >> 'set mpdset hires'
> > > >> 'set gxout shaded'
> > > >> 'set grid on'
> > > >> 'set lon 100 101'
> > > >> 'set lat -1 0'
> > > >> 'define dx =
> > *6.371e3**cos(-1*(3.14159/180))*cdiff(100,0)*(3.14159/180)'
> > > >> 'define dy = *6.371e3**cdiff(-1,0)*(3.14159/180))'
> > > >> 'define xdist = ((lon-100)/0.004492369)*(dx/2]'
> > > >> 'define ydist = ((lat-0)/0.004522556)*dy/2]'
> > > >> 'set z 5'
> > > >> 'set t 1'
> > > >> 'd ref'
> > > >>
> > > >> I checked grads document and I found that 6.371e3 is radius of the
> > earth
> > > >> (6371 to 6374 km)*.*
> > > >> *
> > > >> *
> > > >> *I tried to change "*6.371e3" to! "0e10" which is mean 0 to 10 km)
> > > >> But still the progr am did not run normally.
> > > >>
> > > >> I changed the value of lon and lat in script with 100 and -1.
> > > >> but still I got error.
> > > >>
> > > >> Please help me to solve it.
> > > >>
> > > >> Thank you very much
> > > >> Best regards,
> > > >> wendi
> > > >>
> > > >> On Sat, Feb 2, 2013 at 2:21 AM, Jeff Duda <jeffduda319 at gmail.com>
> > wrote:
> > > >>
> > > >>> Wendi,
> > > >>> You need to run those two define commands at the top of my previous
> > > >>> email before attempting to define the xdist and ydist fields. Also,
> > since
> > > >>> I can see your control file information, I can see that dlon is
> > 0.004492369
> > > >>> and dlat is 0.004522556. So substitute those two values into your
> > > >>> expressions for xdist and ydist also.
> > > >>>
> > > >>> Jeff
> > > >>>> >>>
> > > >>> On Fri, Feb 1, 2013 at 4:36 AM, wendi harjupa <
> > wendiharjupa at gmail.com>wrote:
> > > >>>
> > > >>>> Dear Mr. Jeff
> > > >>>>
> > > >>>> I have tried to use the scipt which you suggested,
> > > >>>> But, still I could not do it. Would you help me more...
> > > >>>>
> > > >>>> here I send my gs file :
> > > >>>>
> > > >>>> 'reinit'
> > > >>>> 'open try2.ctl'
> > > >>>> 'set grads off'
> > > >>>> 'set mproj latlon'
> > > >>>> 'set mpdset hires'
> > > >>>> 'set gxout shaded'
> > > >>>> 'set grid on'
> > > >>>> 'set lon 100 101'
> > > >>>> 'set lat 0 1'
> > > >>>> 'define xdist = [(lon 99.7)/dlon]*[dx/2]'
> > > >>>> 'define ydist = [(lat -1.02)/dlat]*[dy/2]'
> > > >>! >> 'set z 5'
> > > >>>> 'set t 1'
> > > >> >> 'd ref'
> > > >>>>
> > > >>>> Below is my ctl file :
> > > >>>>
> > > >>>> DSET 1013.dat
> > > >>>> TITLE RADAR
> > > >>>> OPTIONS TEMPLATE LITTLE_ENDIAN
> > > >>>> UNDEF -1000
> > > >>>> XDEF 321 LINEAR 99.688120996 0.004492369
> > > >>>> YDEF 321 LINEAR -1.083708891 0.004522556
> > > >>>> ZDEF 39 LINEAR 1.0 0.5
> > > >>>> TDEF 15 LINEAR 13:00Z10apr2004 4mn
> > > >>>> VARS 2
> > > >>>> ref 39 99 Reflectivity(dBZ)
> > > >>>> vel 39 99 Doppler Velocity(m/s)
> > > >>>> ENDVARS
> > > >>>>
> > > >>>>
> > > >>>> Would you check my gs file, is there something that I have to
> > revise??
> > > >>>>
> > > >>>> Thank you very much.
> > > >>>>
> > > &g! t;>>> Best regards,
> > > >>>> wendi
> > > >>>>
> > > >>>>
> > > >>>>
> > > >>>> On Fri, Feb 1, 2013 at 10:34 AM, Jeff Duda <jeffduda319 at gmail.com
> > >wrote:
> > > >>>>
> > > >>>>> These commands will help.
> > > >>>>>
> > > >>>>> 'define dx =
> > 6.371e3*cos(lat*(3.14159/180))*cdiff(lon,x)*(3.14159/180)'
> > > >>>>> 'define dy = 6.371e3*cdiff(lat,y)*(3.14159/180))'
> > > >>>>>
> > > >>>>> They define grid increments in terms of spatial distance rather
> > than
> > > >>>>> geographic distance. If you're trying to change the axes and tick
> > marks,
> > > >>>>> you'll have to define an origin and define your x and y distances
> > based on
> > > >>>>> that. For instance, if you set your lower left domain corner
> > (latitude 0
> > > >>>&gt! ;> and longitude 100), then you can define your coordinate
> > distance s using
> > > >>>>>
> > > >>>>> 'define xdist = [(lon-100)/dlon]*[dx/2]'
> > > >>>>> 'define ydist = [(lat-0)/dlat]*[dy/2]'
> > > >>>>>
> > > >>>>> I think this should work, but I haven't tested it myself, so I
> > don't
> > > >>>>> know. dlon and dlat are the step values from the XDEF and YDEF
> > lines of
> > > >>>>> the control file, respectively.
> > > >>>>>
> > > >>>>> Jeff Duda
> > > >>>>>
> > > >>>>> On Thu, Jan 31, 2013 at 7:02 AM, wendi harjupa <
> > wendiharjupa at gmail.com
> > > >>>>> > wrote:
> > > >>>>>
> > > >>>>>> Dear Sir/Madam
> > > >>>>>>
> > > >>>>>> I need help
> > > >>>>>> I have problem with grads command,
> > > >>>>>> I am not well understand wi! th command gr2XY,
> > > >>>>>>
> > > >>>>>> Actually I want to convert the lon 100 to 101, and lat 0 to 1 to
> > > >>>>>> distance (km)
> > > >>>>>> let think that lon 100 is 0 km, and lat 0 is 0 km,
> > > >>>>>>
> > > >>>>>> what command I can use to convert lon and lat to km?
> > > >>>>>>
> > > >>>>>> Thank you very much for your help
> > > >>>>>>
> > > >>>>>> best regards,
> > > >>>>>> --
> > > >>>>>> -------------
> > > >>>>>> Wendi Harjupa. ST
> > > >>>>>> Shimane University Graduate School of Engineering Sciences
> > > >>>>>> Department of Electronic Control Systems
> > > >>>>>> Remote Sensing Laboratory
> > > >>>>>> s119447
> > > ! >>>>>> Cellphone : +81-080-4268-6676
> > > >&gt ;>>>> email : wendi at rslab.riko.shimane-u.ac.jp
> >
> > > >>>>>>
> > > >>>>>> _______________________________________________
> > > >>>>>> gradsusr mailing list
> > > >>>>>> gradsusr at gradsusr.org
> > > >>>>>> http://gradsusr.org/mailman/listinfo/gradsusr
> > > >>>>>>
> > > >>>>>>
> > > >>>>>
> > > >>>>>
> > > >>>>> --
> > > >>>>> Jeff Duda
> > > >>>>> Graduate research assistant
> > > >>>>> University of Oklahoma School of Meteorology
> > > >>>>> Center for Analysis and Prediction of Storms
> > > >>>>>
> > > >>>>> _______________________________________________
> > > >>>>> gradsusr mailing list
> > > >>>>> gradsusr at gradsusr.org
> > > >>&gt! ;>> http://gradsusr.org/mailman/listinfo/gradsusr
> > > >>>>>
> > > >>>>>
> > > >>>>
> > > >>>>
> > > >>>> --
> > > >>>> -------------
> > > >>>> Wendi Harjupa. ST
> > > >>>> Shimane University Graduate School of Engineering Sciences
> > > >>>> Department of Electronic Control Systems
> > > >>>> Remote Sensing Laboratory
> > > >>>> s119447
> > > >>>> Cellphone : +81-080-4268-6676
> > > >>>> email : wendi at rslab.riko.shimane-u.ac.jp
> >
> > > >>>>
> > > >>>> _______________________________________________
> > > >>>> gradsusr mailing list
> > > >>>> gradsusr at gradsusr.org
> > > >>>> http://gradsusr.org/mailman/listinfo/gradsusr
> > > >>>>
> > > >>>>
> > > >>>
> > > >>>
> > &! gt; >>> --
> > > >>> Jeff Duda
> > > >>&gt ; Graduate research assistant
> >
> > > >>> University of Oklahoma School of Meteorology
> > > >>> Center for Analysis and Prediction of Storms
> > > >>>
> > > >>> _______________________________________________
> > > >>> gradsusr mailing list
> > > >>> gradsusr at gradsusr.org
> > > >>> http://gradsusr.org/mailman/listinfo/gradsusr
> > > >>>
> > > >>>
> > > >>
> > > >>
> > > >> --
> > > >> -------------
> > > >> Wendi Harjupa. ST
> > > >> Shimane University Graduate School of Engineering Sciences
> > > >> Department of Electronic Control Systems
> > > >> Remote Sensing Laboratory
> > > >> s119447
> > > >> Cellphone : +81-080-4268-6676
> > > >> email : wendi at rslab.riko.shimane-u.ac.jp
> > > >>
> > > >> _______________________________________________
> > > >> gradsusr mailing! list
> >
> > > >> gradsusr at gradsusr.org
> > > >> http://gradsusr.org/mailman/listinfo/gradsusr
> > > >>
> > > >>
> > > >
> > > >
> > > > --
> > > > Jeff Duda
> > > > Graduate research assistant
> > > > University of Oklahoma School of Meteorology
> > > > Center for Analysis and Prediction of Storms
> > > >
> > > > _______________________________________________
> > > > gradsusr mailing list
> > > > gradsusr at gradsusr.org
> > > > http://gradsusr.org/mailman/listinfo/gradsusr
> > > >
> > > >
> > >
> > >
> > > --
> > > -------------
> > > Wendi Harjupa. ST
> > > Shimane University Graduate School of Engineering Sciences
> > > Department of Electronic Control Systems
> > > Remote Sensing Laboratory
> > > s119447
> > > Cellphone : +81-080-4268-6676
> > > email : wendi at rslab.riko.shimane-u.ac.jp
> > > -------------- next part --------------
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> >
> > >
> > > _______________________________________________
> > > gradsusr mailing list
> > > gradsusr at gradsusr.org
> > > http://gradsusr.org/mailman/listinfo/gradsusr
> > >
> > >
> > > End of gradsusr Digest, Vol 36, Issue 8
> > > ***************************************
> > *
> >
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> > gradsusr mailing list
> > gradsusr at gradsusr.org
> > http://gradsusr.org/mailman/listinfo/gradsusr
> >
> >
> 
> 
> -- 
> Jeff Duda
> Graduate research assistant
> University of Oklahoma School of Meteorology
> Center for Analysis and Prediction of Storms
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