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[ferret_users] average values excluding zeroes

Dear ferret users,

I am averaging the area of interest and I am getting the mean, standard deviation which counts zero also to get mean. How to exclude the zero in the selected area grids and get the real mean value.

Here is my script:

let xci = {77,79,79,83,83,84,84,83,83,82,82,80,80,79,79,76,76,73,73,72,72,74,74,75,75,77,77}
let yci = {27,27,25,25,24,24,21,20,20,19,18,18,17,17,16,16,15,15,15,18,21,21,23,23,24,24,24}
let ci = pt_in_poly(rf[d=1],xci, yci)
let ci_data = if ci eq 1 then ci*rf[d=1,l=18050:18171]

let temp=ci_data[x=65:95@ave,y=5:40@ave]
let sum=MISSING(temp,0)
let sum_good=IFV temp then 1 else 0
let count=sum_good
let mean=sum/count

stat mean
sh sym stat*
let varmean = ($stat_mean)
let varstd = ($stat_std)
list/norowlab/nohead/append/file=CI.txt varmean, varstd


Nitin Patil

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