Help with Data Analysis

[Chi Nguyen]

Hi Idowu,

I have an idea which may help to solve your problem.

1) Make a mask field, with has value =1 at your 36 selected grid points, and =0 elsewhere. Say, its name is mask

2) Suppose the variable you need to analyse is F. Then define:
  F_new=mask*F
so F_new will be equal F at that 36 points, and 0 elsewhere.

3) It will be easy to find max and min of F_new. In the case that F is all positive or negative, you will need to do two times:
i.e. for finding max do as above, but for finding min
  F_new=-1*mask*F

Hope that this makes sense to you. Good luck!

Cheers, Mai



oluseun idowu <oluseun_idowu at YAHOO.COM> wrote:>
> Dear Users,
>
> Is there anyone who know what I should do for a solution to these
> questions:
>
> 1) I have a grib data with an array of 278 columns and 111 rows for 8
> time steps of 3hrs interval (00,03,06, ..., 21)
>
> 2) I need to automatically extract the Maximum and Minimum data between
> (00 hr and 21hr) at 36 selected grid points from this data set.
>   3)    The data consist of 2 years data.
>
>   Your help will be appreciated.
>
>   Thanks,
>   Idowu
>
>
>
>
> ---------------------------------
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--
*********************************
Nguyen Chi Mai
School of Mathematical Sciences
R. 462, Bld. 28, Clayton Campus
Monash University
Work Ph. +61 3 9905 4424