Hi Izidine I suggest the following: let temp_below = if TEMP[d=1] lt TMXDJFBBOTTOM10[d=2] then 1 else 0 let temp_all = if TEMP[d=1] then 1 let temp_below_percent = temp_below[t=@din]/temp_all[t=@din]*100.0 shade temp_below_percent This should give you a map that shows the percentage of the time where TEMP[d=1] < TMXDJFBBOTTOM10[d=2] at each location. Marco Izidine Pinto wrote: > Dear ferret users > > I have two data files > > 1> /Tmax.DJF.daily.1981_1999.echama2.nc > <http://Tmax.DJF.daily.1981_1999.echama2.nc> > name title > I J K L > TEMP TEMPERATURE AT 1.5M 1:127 1:110 1:1 > 1:1680 > > 2> /tmxdjf10th.b.ech.nc <http://tmxdjf10th.b.ech.nc> (default) > name title I > J K L > TMXDJFBBOTTOM10 > DJF Max temp 10th percentile 19 1:127 1:110 1:1 ... > > > I was wondering if someone could help me to calculate the percentage of > time where > TEMP[d=1] < TMXDJFBBOTTOM10[d=2] > > > Any help is strongly appreciated > -- > Izidine Pinto > :-) -- *************************************** Marco Steinacher Climate and Environmental Physics Physics Institute, University of Bern Sidlerstrasse 5, CH-3012 Bern Phone ++41 (0)31 631 34 02 Fax ++41 (0)31 631 87 42 steinacher@xxxxxxxxxxxxxxxx http://www.climate.unibe.ch/~steinach OpenPGP Key ID: 0x62937F7F ***************************************
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