function int

[Michael Fiorino]

hi tetsuo,

there is no grads function int, but there is a script function math_int.

if you really wanted to convert a grads expression to an integer, you'd
have to implement as an extension, but it looks like you want to convert
a script variable to int, so use math_int...

/r mike

Tetsuo Nakazawa wrote:
> Dear GrADS users,
>
>  I tried to use the function of int (truncate the real number to
> integer),
> but an error came when I used opengrads 2.0.a5.oga.5 for Mac OSX.
>
>  The script and the anal_p.ctl are as follows
>
> 'open anal_p.ctl'
> 'set lon 30 180'
> 'set lat -40 40'
> 'i0=ugrdsfc*2.+1.'
> 'd i0'
> 'd int(i0)'
>
>  It worked fine to "d i0", but when I did "d int(i0)", then
> the following error message came.
>
> Syntax Error:  Invalid Operand
>   'int' not a variable or function name
>   Error ocurred at column 1
> DISPLAY error:  Invalid expression
>   Expression = int(i0)
>
>
> function int(i0)
>   i=0
>   while(i<12)
>     i=i+1
>     if(substr(i0,i,1)='.')
>       i0=substr(i0,1,i-1)
>       break
>     endif
>   endwhile
> return(i0)
>
>
> * content of anal_p.ctl
>
> dset ^anal_p.%y4%m2%d2%h2
> index ^anal_p.idx
> undef 9.999E+20
> title grib.anal_p
> dtype grib 255
> options yrev template
> ydef  145  linear  -90.0  1.25
> xdef  288  linear    0.0  1.25
> tdef 124 linear 00Z01jan1979 6hr
> zdef 23  levels
> 1000 925 850 700 600 500 400 300 250 200 150 100 70 50 30 20 10 7 5 3
> 2 1 0.4
> vars 13
> HGTprs   23 7,100,0   ** Geopotential height            [gpm]
> TMPprs   23 11,100,0  ** Air temperature                  [K]
> SPFHprs  23 51,100,0  ** Specific humidity            [kg/kg]
> DEPRprs   8 18,100,0  ** Dew point depression             [K]
> UGRDprs  23 33,100,0  ** Zonal wind                     [m/s]
> VGRDprs  23 34,100,0  ** Meridional wind                [m/s]
> CWATprs  12 76,100,0  ** Cloud water content         [kg/m^2]
> PRMSLmsl  0 2,102,0   ** Pressure reduced to MSL         [Pa]
> TMPsfc    0 11,105,2  ** Surface 2m air temperature       [K]
> SPFHsfc   0 51,105,2  ** Surface 2m specific humidity [kg/kg]
> DEPRsfc   0 18,105,2  ** Surface 2m dew point depression  [K]
> UGRDsfc   0 33,105,10 ** Surface 10m zonal wind         [m/s]
> VGRDsfc   0 34,105,10 ** Surface 10m meridional wind    [m/s]
> ENDVARS
>
>
>
> ********************************************
> Tetsuo Nakazawa
>                       nakazawa at mri-jma.go.jp
> Typhoon Research Department
> Meteorological Research Institute
> Tel:  029-853-8671 Fax: 029-853-8735
> ********************************************