how to ignore missing values in if statement

Hi dear all,

My data includes lots of missing values, I just want to know how to ignore
these values in the following if judgements. My code is like:

 74 do lev = 0,35
 75 do i = 0,11
 76 if
(.not.all(ismissing(conc)).and.conc(lev,i,istations).lt.150.and.conc(lev+1,i,istations).gt.150)
then
 77 sonde_h(i,istations) = (plev_sonde(lev) +
plev_sonde(lev+1))/2.
 78 end if
 79 end do
 80 end do

The error information is:

fatal:The result of the conditional expression yields a missing value. NCL
can not determine branch, see ismissing function
fatal:["Execute.c":7556]:Execute: Error occurred at or near line 78 in file
testmissing.ncl

Thank you!

Hongyan

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Received on Thu Dec 6 15:08:13 2012