<html><head><meta http-equiv="Content-Type" content="text/html charset=utf-8"></head><body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" class="">Based on that print out of Z it looks like the fill values have been truncated in some way, so NCL is no longer recognising them as missing. <div class=""><br class=""></div><div class="">Heres how fill values look to me when I print. </div><div class=""><br class=""></div><div class=""><div class="">Variable: x</div><div class="">Type: float</div><div class="">Total Size: 40 bytes</div><div class=""> 10 values</div><div class="">Number of Dimensions: 1</div><div class="">Dimensions and sizes:<span class="Apple-tab-span" style="white-space:pre"> </span>[10]</div><div class="">Coordinates:</div></div><div class=""><div class=""> _FillValue :<span class="Apple-tab-span" style="white-space:pre"> </span>9.96921e+36</div><div class="">(0)<span class="Apple-tab-span" style="white-space:pre"> </span>9.96921e+36</div><div class="">(1)<span class="Apple-tab-span" style="white-space:pre"> </span>9.96921e+36</div><div class="">(2)<span class="Apple-tab-span" style="white-space:pre"> </span>9.96921e+36</div></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">To fix the problem, you could do something along the lines of:</div><div class="">z = where( z .gt. 1e+35, z@_FillValue, z) ; set anything greater than a ridiculously large number to FillValue. </div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Why you have the problem is a different question and requires more investigation as to where the data came from and what you have done to it that may had caused this. </div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""></div><div class="">Good luck, </div><div class=""><span class="Apple-tab-span" style="white-space:pre"> </span>Alan Brammer. </div><div class=""><br class=""></div><div class=""><br class=""></div><div class=""><br class=""><div><blockquote type="cite" class=""><div class="">On 18 Nov 2015, at 01:40, Amadou Coulibaly <<a href="mailto:mpapin24@gmail.com" class="">mpapin24@gmail.com</a>> wrote:</div><br class="Apple-interchange-newline"><div class=""><div dir="ltr" class=""><div class="gmail_default" style="font-family:courier new,monospace;font-size:large">Dear NCL users,<br class=""><br class=""></div><div class="gmail_default" style="font-family:courier new,monospace;font-size:large">I am trying to get the indices of non-missing values from 1D array which looks like:<br class=""><br class="">Variable: z<br class="">Type: float<br class="">Total Size: 112 bytes<br class=""> 28 values<br class="">Number of Dimensions: 1<br class="">Dimensions and sizes: [28]<br class="">Coordinates: <br class="">Number Of Attributes: 1<br class=""> _FillValue : 9.96921e+36<br class="">(0) 900<br class="">(1) 900<br class="">(2) 900<br class="">(3) 900<br class="">(4) 9.97e+36<br class="">(5) 900<br class="">(6) 900<br class="">(7) 900<br class="">(8) 9.97e+36<br class="">(9) 900<br class="">(10) 9.97e+36<br class="">(11) 900<br class="">(12) 9.97e+36<br class="">(13) 9.97e+36<br class="">(14) 9.97e+36<br class="">(15) 9.97e+36<br class="">(16) 9.97e+36<br class="">(17) 900<br class="">(18) 9.97e+36<br class="">(19) 9.97e+36<br class="">(20) 900<br class="">(21) 900<br class="">(22) 900<br class="">(23) 9.97e+36<br class="">(24) 9.97e+36<br class="">(25) 9.97e+36<br class="">(26) 9.97e+36<br class="">(27) 9.97e+36<br class=""><br clear="all" class=""></div><div class="gmail_default" style="font-family:courier new,monospace;font-size:large">So I used "ind0=ind(.not.ismissing(z))" and when I printed out "print(ind0)", I got this:<br class=""><br class="">Variable: ind0<br class="">Type: integer<br class="">Total Size: 112 bytes<br class=""> 28 values<br class="">Number of Dimensions: 1<br class="">Dimensions and sizes: [28]<br class="">Coordinates: <br class="">(0) 0<br class="">(1) 1<br class="">(2) 2<br class="">(3) 3<br class="">(4) 4<br class="">(5) 5<br class="">(6) 6<br class="">(7) 7<br class="">(8) 8<br class="">(9) 9<br class="">(10) 10<br class="">(11) 11<br class="">(12) 12<br class="">(13) 13<br class="">(14) 14<br class="">(15) 15<br class="">(16) 16<br class="">(17) 17<br class="">(18) 18<br class="">(19) 19<br class="">(20) 20<br class="">(21) 21<br class="">(22) 22<br class="">(23) 23<br class="">(24) 24<br class="">(25) 25<br class="">(26) 26<br class="">(27) 27<br class=""><br class=""></div><div class="gmail_default" style="font-family:courier new,monospace;font-size:large">But I am just looking for the indices of non-missing values in z.<br class=""><br class=""></div><div class="gmail_default" style="font-family:courier new,monospace;font-size:large">What's wrong with this?<br class=""></div><br class="">-- <br class=""><div class="gmail_signature"><div dir="ltr" class=""><b 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