Hi all, I have a simple problem, bu don't find the solution: I like to count not-empty fields in Collect (number of height measurements per plot, where height is not measured for all trees). I tried idm:not-blank() in the Apply when field, but still I get the number of trees (all) instead the number of height measurements. Any hint is welcome!

Thanks, Lutz

asked 20 Feb, 10:13

Fehrmann's gravatar image

Fehrmann
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accept rate: 0%


Hi Lutz,

if I remember right, 'Apply when' does not work with functions, see answer at http://www.openforis.org/support/questions/1301/table-type-entity-how-to-check-sum-of-attributes-in-a-column

This might work for entity 'tree':

count(tree[idm:not-blank(tree_height)])

But if you want that 0 is regarded as missing height value, then use this

count(tree[tree_height>0])

Regards, Lauri

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answered 24 Feb, 13:14

LauriV's gravatar image

LauriV
1912210
accept rate: 12%

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question asked: 20 Feb, 10:13

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last updated: 24 Feb, 13:14