Hi
Perhaps it is due to the fact that Ferret saves the user-defined variable (and also the coordinates) in double precision. You can control the type of the variable with the "Set Var /Outtype=" command.
From the documentation: "For user-defined variables and variables from non-NetCDF files, the data type is double precision"
http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/SAVE#SAVE_OUTPUT_TYPE
Regards,
Bruno
On 03/17/2017 03:13 PM, Peter Szabo wrote:
Perhaps it is due to the fact that Ferret saves the user-defined variable (and also the coordinates) in double precision. You can control the type of the variable with the "Set Var /Outtype=" command.
From the documentation: "For user-defined variables and variables from non-NetCDF files, the data type is double precision"
http://ferret.pmel.noaa.gov/Ferret/documentation/users-guide/commands-reference/SAVE#SAVE_OUTPUT_TYPE
Regards,
Bruno
On 03/17/2017 03:13 PM, Peter Szabo wrote:
Dear Nicolas, I also wonder why my file sizes always become way (usually double or 4 times) larger than the original ones even if they share still the same dimensions. The original file is 1.5 MB, while the saved out one with just values masked out are 6.0 MB. It is the simplest operation with a short formula and still making the file size way larger. Regards, Peter Szabo !FERRET v6.9 !Linux 2.6.32-431.5.1.el6.x86_64 32-bit - 04/03/14 use TMAX7100mon_14_CCLIM.nc use NATER_mask.nc !THIS CONSISTS OF 1 TIME DIMENSION AND 1s WHERE THE MASK IS VALID let maszkHU=mask[d=2,gx=longitude,gy=latitude,l=1] let txHU=maszkHU*tx[d=1] save/.. txHU 2017-03-17 11:26 GMT+01:00, Nicolas Freychet <nicolas.freychet@xxxxxxxxx>:Hi all, I computed the daily minimum of temperature based on 3h datasets (8 values/day), using the methodology (by steps of 8, I pick up the minimum temperature, and associate it to the first step to record it) define axis/calendar=julian/t=01-jan-1979:31-dec-1995:3/units=hours tmodel repeat/range=1:49672:8/name=it ( let tmin=temp[l=`it`]*0+tmin[l=`it`:`it+7`@min] ; save/append/file=Output.nc Tmin[l=`it`,gt=tmodel@asn] ) The problem is my output file is much bigger than it should. I got the impression that Ferret is recording the whole "formula" and not just the value of Tmin. Is there a way to solve that? (my way to define Tmin may not be optimal though, that may cause the problem...) Thanks, Nicolas ---------------------------------------------------- Nicolas Freychet PDRA, School of Geosciences University of Edinburgh ----------------------------------------------------
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Bruno LEVIER |