TERRAggregation_TimeSpan
In the Spotfire
Custom Expressions dialog box, you can select the pre-defined expression
TERRAggregation_TimeSpan
from the
Function list. This expression function sets the variable
output
to a scalar value of the TERR data type
difftime
, which Spotfire converts to the corresponding Spotfire data type TimeSpan.
The TERR script is called once for each group of data to be aggregated. No special handling for aggregation is necessary in your TERR script.
Argument | Argument description |
---|---|
A TERR script. | The TERR script contains the following.
|
Spotfire column names. | Passed as additional arguments, these are the data column names that
input1 to
inputN represent. All columns must be the same length.
|
Returned by TERR | Converted in Spotfire |
---|---|
A single aggregated value of data type
difftime with units defined as seconds.
|
A single aggregated value of data type TimeSpan. |
TERRAggregation_TimeSpan example
In this example, in Spotfire, take thirty observations with a start time and an end time. Calculate the observation time for each entry.
TERRAggregation_TimeSpan("output <- max(input2-input1)",[Start time],[End time])
max
, and Spotfire contains the function
Max
. ) You must overwrite this autocorrection manually to ensure that you use the TERR function case and name in your expression function.
See Embedding the contents of a script in an expression function for a detailed procedure for creating an expression function.