Intrinsic Functions and Operators
Logi Analytics products include a set of intrinsic scripting functions and operators, modeled on VBScript, that provide commonly-required functionality and which are available in all "formula"-capable element attribute values. This topic identifies these functions and operators and also identifies some reserved words to be aware of.
Intrinsic functions and operators are available regardless of which scripting language has been specified as the default for a Logi application, except as noted below. Formulas are expressions made up of literals, tokens, functions, and operators.
Functionnames are case-insensitive reserved words. Functions return values, which are usually the result of computations based on data and constants.
Use "Formula Attributes"
During development using Logi Studio, formulae with functions can be entered into some attribute values. So-called "formula attributes" are those whose values can evaluate a formula and/or tokens; not all attributes are formula attributes.
There is no comprehensive list of the formula attributes - mostly because not all tokens are evaluated equally, so for each attribute it's often more about what type of tokens can be evaluated, as opposed to whether tokens are evaluated at all.
A a general rule, with the exception of the ID attribute, token evaluation is supported in most attributes. However, for reasons of backward compatibility, some tokens are not evaluated in Super Element formulae. These situations are subject to periodic review and requests to make specific attributes evaluate formulae and/or tokens, or Super Element formula evaluate tokens, are welcome; please use the DevNet Enhancement Ideas area to make such a request.
The method used to indicate that an evaluation is needed depends on the attribute characteristics:
In attributes that expect a True or False value, such as the Division element's Condition attribute, shown above left, any formula entered will be automatically evaluated. Similarly, all attributes that are actually named "Formula", as in the Calculated Column element, will expect to evaluate a formula.
However, in some attributes that typically expect text, such as the Label element's Caption attribute, shown above right, a leading equals sign can be used to trigger a formula evaluation. There is no published list of the elements that fall into this category, so learning them is a matter of experience. When in doubt, try it with and without the leading equals sign.
Tokens are placeholders for data or values, and are resolved at runtime by the Logi Engine. Datalayer data is represented in formulae using @Data tokens, in this format: @Data.UnitPrice~. Tokens are case-sensitive. Some of the other tokens include @Request, @Local, and @Session.
Here are some examples of formulae using @Data tokens:
Multiply a data column by an constant value to calculate the tax applied to the price.
@Data.UnitPrice~ * .04
Get the number of days from the order date to the shipment date.
DateDiff("d", CXMLDate("@Data.OrderDate~"), CXMLDate("@Data.ShippedDate~") )
Concatenate columns and strings together, in a Label caption, language is VBScript. This might return: "Smith, John".
=@Data.LastName~ & ", " & @Data.FirstName~
In super-elements, such as the Analysis Grid, users can build formulae at runtime in the element's user interface; functions can be part of these formulae and they're typed directly into the appropriate UI panels. Data is represented in these formulae by enclosing the column name within square brackets, for example: [UnitPrice]
Here are some examples of formulae in a super-element user interface:
Multiply two data columns, UnitPrice and Quantity, to make an ExtendedPrice column.
[UnitPrice] * [Quantity]
Get the number of weekdays since the shipment date.
DateDiff("w", [ShippedDate], Now )
[LastName] + ', ' + [FirstName]
The following table describes the intrinsic functions, which accept one or more parameters and return a single value. Double-quotes are used around string parameters and tokens that contain date/time values. In the Syntax column below, parameters in square brackets are optional.
Returns the absolute value of a number.
|Abs(number)||Abs(-5) = 5|
Converts date in ISO format (such as those returned from SQL Server) into compatible format for manipulation by intrinsic or VBScript functions.
returns "10/2/2014 13:30:00"
ISO 8601 format is
Returns the current date.
|DateAdd||Adds or subtracts an interval of time from a date or time; returns a date value||
DateAdd("interval", number, "date value")
DateAdd("d", -7, "@Data.Posted~")
|Interval may be:
yyyy = year
q = quarter
m = month
y = day of year
d = day
w = weekday
ww = week of year
h = hour
n = minute
s = second
|DateDiff||Returns the difference between two dates||
DateDiff("interval", "date value 1", "date value 2")
|For valid interval values, see DateAdd function|
|DatePart||Returns a part of a date||
DatePart("interval", "date value"
Prior to v11.0.727:
For valid interval values, see DateAdd function.
FirstDayofWeek may be:
FirstWeekofYear may be:
|Combines date parts together to make a complete date.||
DateSerial(year, month, day)
|DateValue||Returns a valid date-type value created from a text-type argument. Can convert text dates in many different formats.||
|Day||Returns the day of the month.||Day(date)||Possible return values are from 1-31.|
|Exp||Returns "e" raised to a power. "e" is the base of natural logarithms, called the antilogarithm||Exp(number)|
|FormatCurrency||Formats a number value into currency||FormatCurrency(number [, NumDigitsAfterDecimal [, IncludeLeadingDigit [, UseParensForNegativeNumbers [, GroupDigits ]]]])|
|FormatDateTime||Formats a date-time value.||FormatDateTime(date [, NamedFormat])||NamedFormat may be vbGeneralDate, vbLongDate, vbShortDate, vbLongTime, or vbLongTime|
|FormatNumber||Formats a number.||FormatNumber(number [, NumDigitsAfterDecimal [, IncludeLeadingDigit [, UseParensForNegativeNumbers [, GroupDigits ]]]])|
|FormatPercent||Formats a number as a percentage.||FormatPercent(number [, NumDigitsAfterDecimal [, IncludeLeadingDigit [, UseParensForNegativeNumbers [, GroupDigits ]]]])|
|Hour||Returns the hour of the day||Hour(time)||Possible return values are 0-23.|
|IIF||Returns one value if the expression evaluates True, another value if False. Can be nested.||IIF(expression, true-value, false-value)||
expression is a formula that returns True or False.
|InStr||Returns the starting character position where one string is found within another string.||InStr([start, ] string1, string2 [, compare])||
string1 is string to search, string2 is string to search for. Returns 0 when the string is not found. The first characters is at position 1. Set compare to 1 for case-insensitive searches.
|InStrRev||Same as InStr( ), but search begins from end.||
InStrRev(string1, string2 [, start, ] [, compare])
|See Instr( )|
|Int||Returns the integer portion of a number, removing any decimal places.||Int(number)|
|IsDate||Returns True if the text is a date.||IsDate(text)|
|IsNumeric||Returns True if the text is a number.||IsNumeric(text)|
|LCase||Converts all characters to lower case.||LCase(text)|
|Left||Returns x characters from text, starting from left.||Left(text, x)|
|Len||Returns the number of characters in the text.||Len(text)|
|LTrim||Removes any spaces from left end of text.||LTrim(text)|
|Mid||Returns sub-string of characters from the middle of the text.||Mid(text, start [, length])||start is the position of first character to be returned. The first character of the entire text is at position 1.
length is the number of characters to be returned.
|Minute||Returns the minute of the hour.||Minute(time)||Possible return values are 0-59.|
|Month||Returns the month of the year.||Month(date)||Possible return values are 1-12.|
|MonthName||Returns the name of the month.||MonthName(month# [, abbreviate])||Set abbreviate to True for an abbreviated month name.|
|Now||Returns the current date and time.||Now()|
|Replace||Replaces instances of text with other text.||Replace( text, textFind, textReplaceWith [, start [, count [, compare ]]])||
text is the original text, textFind is the text to be replaced, textReplaceWith is the replacement text
start is the starting character position to be searched
|Right||Returns x characters from text, starting from right.||Right(text, x)|
|Rnd||Returns a random number between 0 and 1.||
If number is:
|Round||Returns a number rounded to a specified number of decimal places.||Round(expression [, numdecimalplaces])|
|RTrim||Removes any trailing spaces from right end of text.||RTrim(text)|
|Second||Returns the second of the minute.||Second(time)||Possible return values are 0-59.|
|Sgn||Returns indication of number's sign.||Sgn(number)||Returns:
-1 if the number is negative,
1 if the number is positive,
0 if the number is 0.
|Space||Returns a string consisting of the designated number of spaces.||Space(number)|
|Sqr||Returns the square root of a number.||Sqr(number)|
|String||Returns text consisting of the character duplicated x number of times.||String(x, "character")|
|StrReverse||Returns the text with the characters in reverse order.||StrReverse(text)|
|TimeValue||Returns a valid time-type value created from a text-type argument. Can convert text dates in many different formats.||TimeValue(time)|
|Trim||Removes both leading and trailing spaces from the text||Trim(text)|
|UCase||Converts all characters to upper case.||UCase(text)|
|Weekday||Returns the number of the day of the week.||
Weekday(date [, firstdayofweek ])
|Possible return values are 1-7. The first day of the week defaults to 1 = Sunday, but the optional argument can be used to set it differently: 2 = Monday, 3 = Tuesday, etc.|
|WeekdayName||Returns the name of the day corresponding to the weekday number.||WeekdayName(numberWeekday, abbreviate, firstdayofweek)|
|Year||Returns the number of the year of the specified date||Year(date)|
The following table describes the intrinsic operators, which are used for arithmetic operations and logical comparisons. Some intrinsic operators may be overridden depending on scripting language choice, as noted.
|<=||Less Than or Equal To|
|>=||Greater Than or Equal To|
|( and )||Parenthesis, to manage precedence|
You may represent true and false values as True and False.