> Dear NCL users
>
> I try to get the monthly mean by average the daily data. When I use p0 =
> dim_sum(p(lat|:,lon|:,time|:)), then p0 become two dimension
> p0(lat,lon). I hope to get three dimensions output p0(lat,lon,time),
> where dimsize(time)=1, because I need to concatenate all the monthly
> data into a large file. Has anyone know how to solve my problems? Thanks
> a lot.
>
> Song Feng
Dear Song Feng,
You can do this using a combination of the ndtooned/onedtond
functions, that allow you to convert from multi-dimenioned arrays to
single-dimensioned arrays, and vice versa. For example:
dsizes_p = dimsizes(p) ; Dimension sizes of p
ntime = dsizes_p(0) ; Or whatever dimension represents time.
nlat = dsizes_p(1) ; " " " " lat
nlon = dsizes_p(2) ; " " " " lon
p0 = dim_sum(p(lat|:,lon|:,time|:)) ; p0 is (nlat x nlon)
p01d = ndtooned(p0) ; convert to 1D
p0_new = onedtond(p01d,(/nlat,nlon,1/)) ; convert to (nlat x nlon x 1)
Or, you can create the "p0" array in advance:
p0 = new((/nlat,nlon,1/),float)
p0(:,:,0) = dim_sum(p(lat|:,lon|:,time|:))
--Mary
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