[ncl-talk] multiplying var by constant

[Nitin Patil]

Thanks Dennis it worked.

--
Regards,
Nitin Patil

On Wed, Aug 10, 2016 at 4:51 PM, Dennis Shea <shea at ucar.edu> wrote:

> x      = short2flt( f->precip(iStrt:iLast,{latS:latN},{lonL:lonR}))
>
> x    = x*86400
> x at units = "mm/day"
>
> On Wed, Aug 10, 2016 at 4:42 AM, Nitin Patil <nitinpatil85 at gmail.com>
> wrote:
>
>>
>> Dear NCL usrs,
>>
>> In my script I am trying to multiply my data by a constant value like in
>> this rainfall data I want to multiply by 86400 to change unit I tried but
>> not getting compile, any idea where to put it?
>>
>> =================
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_code.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/gsn_csm.ncl"
>> load "$NCARG_ROOT/lib/ncarg/nclscripts/csm/contributed.ncl"
>>
>> begin
>>
>> ;************************************************
>> ; Specify geographical region and time span (year-month start and end
>> ;************************************************
>>
>>   latS     = -90
>>   latN     =  90
>>   lonL     =  0
>>   lonR     = 360
>>
>>   ymStrt   = 197101
>>   ymLast   = 201012
>>
>>   pltType  = "ps"
>>   pltName  = "regress"
>>   pltTitle = "Globe: "+(ymStrt/100)+"-"+(ymLast/100)
>>
>> ;************************************************
>> ; Read from netCDF file: variable is type short...unpack
>> ;************************************************
>>    diri   = "/media/Work/3_LTS_echam6_Data/EACSST_ens_1971-2010/"
>>    fili   = "EACSST_E1_1971-2010_Precip.nc"
>>    f      = addfile(diri+fili,"r")
>>
>>    YYYYMM = cd_calendar( f->time, -1)
>>
>>    iStrt  = ind(YYYYMM.eq.ymStrt)
>>    iLast  = ind(YYYYMM.eq.ymLast)
>>
>>    x      = short2flt( f->precip(iStrt:iLast,{latS:latN},{lonL:lonR}))
>>
>> x at units= "mm/day"
>>
>>    printVarSummary(x)                            ; [time| 1344]x[lat|
>> 91]x[lon| 180]
>>
>>    yyyymm = cd_calendar(x&time, -1)
>>    yyyy   = yyyymm/100
>>
>>    dimx = dimsizes(x)
>>    ntim = dimx(0)                ; all years and months
>>    nlat = dimx(1)
>>    mlon = dimx(2)
>>
>>    year  = ispan(yyyy(0), yyyy(ntim-1), 1)
>>    nyrs  = dimsizes(year)
>>
>> ;************************************************
>> ; Areal averages: cos(lat) is good enough
>> ;************************************************
>>
>>    xann  = month_to_annual(x , 1)                 ; [year| 112]x[lat|
>> 91]x[lon| 180]
>>    xann&year  = year
>>    printVarSummary(xann)
>>
>> ;************************************************
>> ; Calculate the regression coefficients (slopes)
>> ;************************************************
>>    rc           = regCoef(year,xann(lat|:,lon|:,year|:))
>>
>>    rc at long_name = "Trend"
>>    rc at units     = xann at units+"/year"
>>    copy_VarCoords(xann(0,:,:), rc)                ; copy lat,lon coords
>>
>>    printVarSummary(rc)
>>
>> ;************************************************
>> ; for illustration: change units to degC/period-used
>> ;************************************************
>>    rc           = rc*nyrs                       ; (C/year)*(nyrs)
>>    rc at units     = ""+nyrs+" year"
>>
>> ;************************************************
>> ; plotting parameters
>> ;************************************************
>>    wks  = gsn_open_wks("eps","EACSST_trend_yearly_precip")       ;
>> specifies a ps plot
>>    gsn_define_colormap(wks,"precip2_15lev")
>>    res                       = True
>>    res at gsnMaximize           = True             ; make large
>>
>>    res at cnFillOn              = True             ; turn on color
>>    res at cnLinesOn             = False            ; turn off contour lines
>>    res at cnLineLabelsOn        = False            ; turn off contour line
>> labels
>>  ;;res at cnFillMode            = "RasterFill"
>>
>>    res at mpMinLatF             =  5                  ;-- sub-region
>> minimum latitude
>>    res at mpMaxLatF             =  40                 ;-- sub-region
>> maximum latitude
>>    res at mpMinLonF             =  60                  ;-- sub-region
>> minimum longitude
>>    res at mpMaxLonF             =  100                  ;-- sub-region
>> maximum longitude
>>
>>
>>    res at cnLevelSelectionMode  = "ManualLevels"   ; set manual contour
>> levels
>>    res at cnMinLevelValF        =  -0.18            ; set min contour level
>>    res at cnMaxLevelValF        =  0.18            ; set max contour level
>>    res at cnLevelSpacingF       =  0.01            ; set contour interval
>>
>>    res at mpFillOn              = False            ; turn off default
>> background gray
>>   ;res at mpCenterLonF          = 180
>>
>>    res at gsnCenterString       = year(0)+"-"+year(nyrs-1)
>>
>>    res at tiMainString          = "Yearly trend (precip EACSST)"    ; fili
>>    plot = gsn_csm_contour_map_ce(wks,rc,res)
>>   end
>> =================
>> --
>> Regards,
>> Nitin Patil
>>
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>
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