Weiran Zhang wrote:
I'm trying to calculate the average for a set of rainfall values in the
following node-set:
<month number="1">
<day number="1">
<rainfall>1.5</rainfall>
</day>
<day number="2">
<rainfall>0.5</rainfall>
</day>
<day number="3">
<rainfall>TR</rainfall>
</day>
...
</month>
Usually, I'd use "sum(month/day/rainfall) div count(month/day)" to get
the average rainfall, however, as null values are represented as "TR",
that expression returns a NaN error.
Just avoid selecting "TR" values, for example:
sum(month/day/rainfall[.!='TR']) div count(month/day[rainfall!='TR'])
or
sum(month/day/rainfall[.!='TR']) div count(month/day)
depending on what your definition of "average" is.
J.Pietschmann
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