# PDF calculation for a grid node

From: Ioannis Koletsis <koletsis_at_nyahnyahspammersnyahnyah>
Date: Thu Jul 11 2013 - 08:11:03 MDT

Dear ncl users,

I would like to calculate the pdf of wind speed for a grid node.

When I calculated it for a grid point everything went well.

The number of bins, and the maximum wind speed for each grid point have been
estimated correctly (line number 92, 89 respectively), for each grid point
throughout the time period (10957 records)..

Moreover, the printVarSummary for max_ws1 and nbins give me the dimensions..

Number of dimensions 3 (1 x 19 x 17) -> (height x rlat x rlon)

As you can see at the attached script, I tried to solve the problem using do
loops but unfortunately without success.

Has anyone got any idea, how to calculate the pdf for each grid point..

Any help would be appreciated..

Ioannis

;*************************************************

; PDF Calculation

;*************************************************

begin

Files = systemfunc ( " ls " + DataDir + \

"C4IRCA3_A2_ECHAM5_DM_*.nc")

numFiles = dimsizes(Files)

print(Files)

print(" ")

time = f1[:]->time

ws = f1[:]->wss

ws@_FillValue = 1.e+30

lat2d = f1[0]->lat

lon2d = f1[0]->lon

time2 = ut_calendar(time, 0)

time3 = ut_calendar(time, -2) ; Date format

year = tointeger(time2(:,0)) ; Convert to integer

month = tointeger(time2(:,1))

day = tointeger(time2(:,2))

beg_year = 1961

end_year = 1990

beg_month = 01

end_month = 12

beg_day = 01

end_day = 31

ymdStrt = beg_year*10000+beg_month*100+beg_day

ymdLast = end_year*10000+end_month*100+end_day

print("ymdStrt="+ymdStrt+" ymdLast="+ymdLast)

itime = ind(time3.ge.ymdStrt.and.time3.le.ymdLast)

if (ismissing(itime(0))) then ; Error message

print("itime is missing:something is going wrong")

exit

end if

;======================================================================

; Select the subregion (Mediterranean Area)

;======================================================================

; latS = 30

; latN = 46

; lonW = -10

; lonE = 41

latS = 36

latN = 40

lonW = 22

lonE = 26

ji = region_ind(lat2d,lon2d,latS,latN,lonW,lonE)

jStrt = ji(0)

jLast = ji(1)

iStrt = ji(2)

iLast = ji(3)

llat2d = lat2d(jStrt:jLast,iStrt:iLast)

llon2d = lon2d(jStrt:jLast,iStrt:iLast)

ws2 = ws(itime,:,jStrt:jLast,iStrt:iLast)

ws1 = 1.2697*ws2 ; wind speed at hub height

; print(ws1)

; printVarSummary(ws2)

; printVarSummary(ws1)

;======================================================================

; Calculate probability function

;======================================================================

opt = True

opt@bin_spacing = 0.2

max_ws1 = dim_max_n(ws1,0)

min_ws1 = 0.

nbins = floattointeger(((max_ws1 - min_ws1) / 0.2)+1) ; bins number

; print(nbins)

dimx = dimsizes(ws1)

nlev = dimx(0)

nlat = dimx(1)

mlon = dimx(2)

do kk = 1, 10957

do nl = 0, nlat-1

do ml = 0, mlon-1

do nt = 0, nlev-1

wspdf=(pdfx(ws1(kk,nt,nl,ml),nbins,opt))

end do

end do

end do

end do

print(wspdf)

end

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• application/octet-stream attachment: pdf.ncl
Received on Thu Jul 11 08:11:01 2013

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