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Re: [ferret_users]

Hi Paulo,
First a quick suggestion - please remember to put a subject into your messages to the list, so people can see the topic before reading the message.

I'll point you to some sections of the documentation that may help you.  In the section about the average transform,

follow the link where it says "See the General Information on transformations for important details about this transformation."  In that General Information there is a paragraph about the distinction between averages using world coordinates, e.g. time strings, vs index ranges. If this doesn't seem to explain what you are seeing, you're welcome to write back to the list showing more detail.  Use the LIST command to show a subset of the data values that you are seeing.


On 7/29/2013 10:56 AM, Paulo Santiago wrote:
Dear Ferret users,

My question is quite basic, but I couldn't solve it alone.

I've been trying to compute the time average of a field using both 'T' (time) and 'L' (index), like that:
set wind 1; fill UCOMP[d=2,x=@ave,L=3:4@AVE]-UCOMP[d=1,x=@ave,L=3:4@AVE];
set wind 2; fill UCOMP[d=2,x=@ave,t=16-JUN-2021:16-JUL-2021@AVE]-UCOMP[d=1,x=@ave,T=16-JUN-2021:16-JUL-2021@AVE];

Being that my L=3 is the day 16-JUN-2021 and my L=4 is the day 16-JUL-2021.

However the two pictures are completely different and the right one is that one I compute using the 'T' axis.

I plot the same picture using other functions, for example @VAR or @MAX, and in these cases the pictures are identical, so I wonder if does anyone know why it is happening for the average? Is there another way to compute the average using L index that I should be aware?

Many thanks,

Paulo Santiago
Ph.D. Student in Meteorology
Brazilian National Institute for Space Research

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