On Wed, Jun 19, 2019 at 3:55 PM Pratik Kad <pratikkad17@xxxxxxxxx> wrote:
Hi Saurabh,
After doing the exact similar thing in the ferret, I got the same figure which you got from CDO.It seems you need to update your PyFerret.Regards,
PratikOn Wed, Jun 19, 2019 at 2:35 PM saurabh rathore <rohitsrb2020@xxxxxxxxx> wrote:Hi Pratik,Thank for your reply. I checked the calendar and time steps of my data that is why I am multiplying my slope with 12 to convert it into per year. But the pattern of the slope is wrong, look the pattern of the slope that I plotted from the trend calculation of cdo with the same data, it is not matching with the pattern of the slope computed using ferret. I checked it with NCL also and its pattern is same as cdo but not like ferret.One thing I can guess that ferret is doing something else with the time index but I am not able to understand it.Cheers, SaurabhOn Wed, Jun 19, 2019 at 3:34 PM saurabh rathore <rohitsrb2020@xxxxxxxxx> wrote:Hi Pratik,Thank for your reply. I checked the calendar and time steps of my data that is why I am multiplying my slope with 12 to convert it into per year. But the pattern of the slope is wrong, look the pattern of the slope that I plotted from the trend calculation of cdo with the same data, it is not matching with the pattern of the slope computed using ferret. I checked it with NCL also and its pattern is same as cdo but not like ferret.One thing I can guess that ferret is doing something else with the time index but I am not able to understand it.Cheers, SaurabhOn Wed, Jun 19, 2019 at 2:32 PM Pratik Kad <pratikkad17@xxxxxxxxx> wrote:Hi Saurabh,
As we know ferret is sensitive to the time axis. by default, it takes the unit of a given parameter, So you need to the checkout time unit of netCDF file. Then multiply by that factor as per your interest.Here your file has time unit in months ( which gives trend per month); Hence you need to multiply by 12 then you will get trend per year.Regards
PratikOn Wed, Jun 19, 2019 at 12:09 PM saurabh rathore <rohitsrb2020@xxxxxxxxx> wrote:Dear Ferreters,G'dayI am having very strange problem in computation of trend (slope). I am replotting my data after 1 year or so and I want to compute trend from it. I am having my data from 2005-2015.Here is the attached data.from ferret I used this script!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!use ohc-ferret.nclet p=t[gt=ohcg1]let q=ohcg1go regresstfill/lev=(-inf)(-20,20,4)(inf)/pal=blue_orange slope*10^-7*12frame/file=test-ferret.png!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!from CDO i used this commandhere b.nc is the slope, then I plotted this slope.use b.ncfill/lev=(-inf)(-20,20,4)(inf)/pal=blue_orange ohcg1*10^-7*12frame/file=test-cdo.nc!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!Now you can see the difference in both the plots. I don't understand why it is happening. Then I checked with NCL also and it is matching with the plot from CDO. Computation of slope from ferret is messing up my calculation and I dont understand why it is so because it never happened before. I am simply modifying my previous plots but it is showing wrong results now with the same old data and scripts.Any suggestions that what is I am doing wrong with ferret ?Cheers, Saurabh--REGARDSSaurabh RathoreResearch Scholar (PhD.)Centre For Oceans, Rivers, Atmosphere & Land Science TechnologyIndian Institute Of Technology, Kharagpurcontact :- 91- 8345984434
--REGARDSSaurabh RathoreResearch Scholar (PhD.)Centre For Oceans, Rivers, Atmosphere & Land Science TechnologyIndian Institute Of Technology, Kharagpurcontact :- 91- 8345984434
--REGARDSSaurabh RathoreResearch Scholar (PhD.)Centre For Oceans, Rivers, Atmosphere & Land Science TechnologyIndian Institute Of Technology, Kharagpurcontact :- 91- 8345984434
