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.