Date range

Ubidots allows you to build new variables from a time series based on date range data, that is, calculate mean, sum, median per hour, etc., using a synthetic variable based on your sensor inputs.

Below you can find the commonly used date range functions.

Function	Description
$max(x, range)$	Returns the maximum value of the variable x in the specified date range.
$min(x, range)$	Returns the minimum value of the variable x in the specified date range.
$mean(x, range)$	Returns the mean value of the variable x in the specified date range.
$std(x, range)$	Returns the standard deviation of the variable x in the specified date range.
$count(x, range)$	Returns the number of dots stored in the variable x for the specified date range.
$last(x, range)$	Returns the last value of the time-series variable x in the specified date range.
$first(x, range)$	Returns the first value of the time-series variable x in the specified date range.
$sum(x, range)$	Returns the sum of the dots stored in the variable x in the specified date range.

Date range functions have the following syntax:

aggregation_method(<variable>,<range>,<position>,<offset> )

Parameters	Description	Value	Mandatory
Variable	It shows the measurements of a sensor as a time series of data points that vary over time. Also known as "dots", it's identified by a variable label.	Variable label	YES
Range	The time window in wich the function will be computed. NOTE: The selected range should be set in a way that evenly divides the next range. For example, if using minutes ("T"), whatever the number n is, it has to evenly divide an hour ("H"). Available values for minutes are: 1, 2, 3, 4, 5, 6, 10, 12, 15, 20, 30. Other values may render unexpected results. Same applies to other ranges.	Available data ranges: this is a positive integer, representing the number of observations used for each window or a time range specified as follows: "nT" : Every n minutes "nH" : Every n hours "nD" : Every n days "W" : Every end of week "M" : Every end of month	YES
Position	Indicates whether the output value will be timestamped at the start of the time series or at the end.	position ="start" or position = "end"	NO
Offset	Sets the hour at which our synthetic variable engine will begin to compute the variable, which is the number of hours after midnight. By default, it's 0 hours.	Any integer between 1 and 23	NO