CALCSTATFUNCARR action

Function
Calculation of statistical archive function for all specified item intervals.


Declaration
CALCSTATFUNCARR archIdent, bt_TmA, et_TmA, step, deepTime, statFuncIdent_Int, validPercIdent_Int, paramIdent, locVarColValueIdent_Rec, statusIdent_Int
 [,archivInstance_Int]
Parameters
archIdentinReference to one value of historical value or reference to an object, values of which have been archived.

Warning: If the parameter is the reference to an object archived several times, there is not specified which one of the historical objects is to be used.
bt_TmAinIdentifier of AbsTime type - interval beginning.
et_TmAinIdentifier of AbsTime type - interval end.
stepinIdentifier of Int type - time step [s].

Note: the parameter must be a positive integer.
deepTimeinIdentifier of Int type - time-depth [s] for calculating the statistics.

Note: The parameter must be a positive integer.
statFunctIdent_IntinIdentifier of Int type - statistical function type.
validPercIdent_IntinIdentifier of Int type - validation criteria.
paramIdentinIdentifier of Int or Real types - parameter for some types of functions.
locVarColValueIdent_RecoutReference to a column of a structured variable of Record type - result values.
statusIdent_IntoutCalculation (action) success.
archivInstance_IntinOptional identifier of Int type - identification of archive instance. If the parameter is not defined, the value 0 will replace it.
Description
The action executes the calculation of the statistical function specified by the statFuncIdent_Int parameter on the values represented by the archIdent historical value for the following time intervals specified by the bt_TmA, et_TmA, step and deepTime parameters:
  • first time interval - <bt_TmA - deepTime; bt_TmA>
  • second time interval - <bt_TmA + step - deepTime; bt_TmA + step>
  • .....
  • n-th time interval - <bt + (N-1)*step - deepTime; bt + (N-1)*step>
The timestamp of the result for a certain time interval is identical to the end time of the time interval. After the action is executed, calculation results are to be filled into the given column of the local variable specified by the locVarColValueIdent_Rec parameter.

The statusIdent_Int parameter gets one of the following values:
  • _ERR_TRANS_ABORT
  • _ERR_TRANS_ERROR
  • _ERR_TRANS_IGNORED
  • _ERR_NO_ERROR
The set of implemented functions is identical with the functions, which may be configured for statistical archive (except the FILTER and TIMESLICE functions). For individual functions, there are predefined local constants in ESL.

The validPerctIdent_Int parameter represents the Validation criteria used during the evaluation of the statistical function. It accepts values within 0 .. 100 (the error ERR_RANGE_ERROR occurs if the condition is not met).

For some of the statistical archive functions, the paramIdent parameter must be specified according to the table:

Statistical functionParameter description
_STAT_F_INTEGRAL

Integral time units. For individual types, there are also established predefined local variables according to the table:

ConstantDescription
_INTEGRAL_HOURUNITHour integral
_INTEGRAL_MINUNITMinute integral
_INTEGRAL_SECUNITSecond integral
_STAT_F_GE_TIME
_STAT_F_GT_TIME
_STAT_F_LE_TIME
_STAT_F_LT_TIME
_STAT_F_ADDITION_PARAM
_STAT_F_INCREMENT_PARAM
_STAT_F_DELTA_PARAM		Compare value

For other statistical archive functions, the paramIdent parameter is not evaluated.

Value of parameter archivInstance_Int defines the instance of the archive which executes the request. If the parameter is not defined (or the value is 0), the active archive instance will execute the request.
Example
Calculation of the weighted floating average of the values within the range of 2 hours.



 TIME _bt
 TIME _et
 INT _step
 INT _deepTime
 REAL _retCode
 INT  _idx
 RECORD NOALIAS (SD.Data) _statData
 
 _bt := %StrToTime("0:00:00 16-11-2006")
 _et := %StrToTime("0:00:00 17-11-2006")
 _step := 3600         ; value for each hour
 _deepTime := 2*_step  ; floating average, time depth of 2 hours
 
 CALCSTATFUNCARR H.Col[1], _bt, _et, _step, _deepTime, _STAT_F_WGAVG, 100, 0, _statData^Value, _retCode
 IF _retCode = _ERR_NO_ERROR THEN
   ; calculation done, browsing result values
      FOR _idx=1 TO _statData\DIM DO_LOOP
     ; _statData[_idx]^Value - value
 ELSE
   ; an error occurred
 ENDIF
Note
Using the CALCSTATFUNC action does not allow evaluating of the FILTER and TIMESLICE statistical functions.

Related pages:

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