This page (revision-21) was last changed on 21-Oct-2017 12:32 by Albrecht Striffler

This page was created on 26-Oct-2012 10:15 by UnknownAuthor

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Doc Expressions
Doc Expressions

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The functionalities described on this page are only available using a commercial extension.
The functionalities described on this page are only available using a commercial extension. Please contact info@denkbares.com for more information.
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Expressions allows to use mathematical formulas to be used in d3web knowledge bases. In every formula you may access existing questions and their values, as well as predefined constants. The results of those formulas may be used to assign it to an existing question or as a precondition in a rule.
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Expressions allow to use mathematical formulas to be used in d3web knowledge bases. In every formula you may access existing questions and their values, as well as predefined constants. The results of those formulas may be used to assign it to an existing question (e.g. in a rule action) or as a condition in a rule.
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IF eval( gradient( measurement[-10s,0s] ) > 1 )
IF eval(gradient(measurement[-10s, 0s]) > 1)
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/%
%
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THEN myGradient = eval( gradient( measurement[-10s,0s] ) )
/%
THEN myGradient = eval(gradient(measurement[-10s, 0s]) )
%
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// use other constants is NOT ALLOWED!!! --> error signaled
// using other constants is NOT ALLOWED!!! --> error signaled
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| ~[..., ...~] | subHistory | Access a sub-history in a certain time range.
| ~[..., ...~] | subHistory | Access a sub-history in a certain time range. If there is not value directly at the start of the subhistory, the next earlier value will be included.
| !~[..., ...~] | strictSubHistory | Access a sub-history in a certain time range. The sub-history will not contain values that were set before the given start.
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* __<object-name>~[<time-point>, <time-point>~]__: \\ Returns the sub-history of the object with the name <object-name> starting from the earlier of the two time-points and lasting to the latter one. The sub-history contains all values of the object's full history that has been valid during the specified interval. This lead to that the sub-history usually starts before the specified time-points and have their latest value before the latter of those specified time-points.
* __<object-name>~[<time-point>, <time-point>~]__: \\ Returns the sub-history of the object with the name <object-name> starting from the earlier of the two time-points and lasting to the latter one. The sub-history contains all values of the object's full history that have been valid during the specified interval. This lead to that the sub-history usually starts before the specified time-points and have their latest value before the latter of those specified time-points.
* __<object-name>!~[<time-point>, <time-point>~]__: \\ Returns the strict sub-history of the object with the name <object-name> starting from the earlier of the two time-points and lasting to the latter one. The sub-history contains all values of the object's full history that have been set during the specified interval. In contrast to the 'normal' sub-history, this strict sub-history will not maybe start before the specified earlier time-point, but only at that earlier time-point or later (but of course not later than the later time-point).
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average(myQuestion[]) // average of all values myQuestion had before (incl. current one)
average(myQuestion[now-10min, now]) // average of the last 10 minutes
average(myQuestion[]) // average of all values myQuestion had before (incl. current one)
average(myQuestion[now-10min, now]) // average of the last 10 minutes
average(myQuestion![now-10min, now]) // average of all values that were set between 10 minutes ago and now
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Below you see all functions that come with the TimeDB plugin by default. If you need additional functionality that is not covered by the provided functions, you might consider defining your own specialized function using Javascript. See __[Doc Javascript Functions]__ for more info.
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Documentation expressions variables formulas timedb
Documentation formulas Expressions timedb variables expressions
This page (revision-21) was last changed on 21-Oct-2017 12:32 by Albrecht Striffler Top