Welcome
Reference
This documentation provides HCL Link reference information.
Functions and Expressions
Use HCL Link functions and expressions to create component rules and map rules.
Math and statistics functions
Precede all MATHLIB functions with mathlib->
ATAN2
The ATAN2 function calculates the arctangent of y,x.

Introduction
Congratulations on your selection of HCL Link as your data integration solution!
What's new
Learn about the new and changed functions and features in HCL Link version 1.3.2.0.
Release notes
Read the latest release specific information for HCL Link version 1.3.2.0.
System requirements
A complete desciption of the hardware and software requirements for both Windows and Linux systems.
Installation
Everything you need to know to install HCL Link.
Administration
Here you will find the tasks that are required for administration of your HCL Link product.
Projects
A project is a container for HCL Link artifacts.
Services
Service definitions define REST services and the endpoints of a service. This guide provides step-by-step instructions for creating, importing, and managing services using the system interface, following Microsoft standards.
Connectors
This documentation describes the connectors and how they are used.
Packages
Servers
This documentation contains a description of the server groups and servers.
Variables
The variables described here include Configuration variables, flow variables, and cache variables.
Dashboards
A description of HCL Link dashboards, including the Server dashboard and the Kibana dashboard.
Runtimes
Descriptions of Link runtime services.
Resource Adapters
About the HCL Link Resource Adapters, and how to use them.
Cloud Native Link
Cloud Native Link refers to the HCL Link product installation on a Kubernetes cluster.
Reference
This documentation provides HCL Link reference information.
- Functions and Expressions
  Use HCL Link functions and expressions to create component rules and map rules.
  - Expressions and evaluations
    The documentation provided here describes HCL Link functions and expressions. Functions and expressions are used to create component rules and map rules.
  - Using functions
    A function is an expression that generates an output by performing a certain operation on one or more inputs.
  - Syntax of a function
    The following is an example of a function:
  - Function argument syntax
    Arguments typically have some restrictions on the expression used for that argument.
  - Character-set encoding functions
    Functions that use the HCL Link EXIT architecture convert data to the native character set of the platform as part of the function call.
  - General functions
    There are several general functions you can call from map rule to process input.
  - Bidirectional functions
    Bidirectional languages such as Arabic and Hebrew are languages in which the text is presented to the user ordered from right to left, but numbers and Latin alphabetic strings within the text are presented left to right.
  - Bit manipulation and testing functions
    You can use this function to manipulate and to test a bit in a binary number.
  - Cache functions
    Use cache functions to specify a value for each of the cache variables defined for a flow, and additionally, to alter an already specified value for a cache variable.
  - Conversion functions
    You can use this function to convert an expression from one datatype to another datatype.
  - Date/time functions
    You can use this function to perform various operations on date and time.
  - Error handling functions
    You can use this function in evaluating the type of error during map execution.
  - External interface functions
    You can use this function to retrieve data from a database from within in a map rule.
  - Flow functions
    Use Flow functions to specify a value for each of the flow variables defined for a flow, and additionally, to alter an already specified value for a flow variable.
  - Inspection functions
    You can use this function to test and inspect the object.
  - Logical functions
    Logical functions provide a way to use logical conditions to display one of several values.
  - Lookup and reference functions
    These function search operates by scanning the appropriate set of items in sequence, attempting to match the logical condition.
  - Math and statistics functions
    Precede all MATHLIB functions with mathlib->
    - ABS
      The ABS function returns the absolute value of a number.
    - ACOSINE
      Use the ACOSINE function to calculate the arccosine of a value.
    - ASIN
      Use the ASIN function to calculate the arcsine of a value.
    - ATAN
      The ATAN function calculates the arctangent of a value.
    - ATAN2
      The ATAN2 function calculates the arctangent of y,x.
    - COSINE
      The COSINE function calculates the cosine of a value.
    - COSINEH
      The COSINEH function calculates the hyperbolic cosine of a value.
    - COUNT
      You can use the COUNT function to return an integer representing the number of valid input or output objects in a series.
    - COUNTABS
      You can use COUNTABS to count the input or output objects in a series, regardless of the validity of the object.
    - EXP
      The EXP function calculates the exponential of a value.
    - FACTORIAL
      The FACTORIAL function calculates the factorial of a value.
    - FROMBASETEN
      You can use FROMBASETEN when you need to convert numbers to a base other than 10.
    - INT
      You can use the INT function when you need only the integer portion of a number.
    - LOG
      The LOG function calculates the logarithms of a value.
    - LOG10
      The LOG10 function calculates the logarithms for base 10 of a value.
    - MAX
      The MAX function returns the maximum value from a series of number, date, time, or text values.
    - MIN
      Use MIN when you need the minimum value from a series of number, date, time, or text values.
    - MOD
      Use MOD when you need the modulus of an integer and a number.
    - POWER
      The POWER function calculates x raised to the power of y.
    - RAND
      The RAND function returns a pseudorandom number.
    - ROUND
      The ROUND function rounds a number to a specified number of decimal places.
    - SEED
      The SEED function primes the RAND and RANDDATA functions so they produce repeated results.
    - SIN
      The SIN function calculates the sine of a value.
    - SINH
      The SINH function calculates the hyperbolic sine of a value.
    - SQRT
      The SQRT function returns the square root of a number.
    - SUM
      The SUM function calculates the sum of a series of numbers.
    - TAN
      The TAN function calculates the tangent of a value.
    - TANH
      The TANH function calculates the hyperbolic tangent of a value.
    - TOBASETEN
      The TOBASETEN function converts a text item that can be interpreted as a number, using positional notation of the base specified, to a base 10 number.
    - TRUNCATE
      The TRUNCATE function removes decimal places from a number, leaving a specified number of decimal places.
  - Text functions
    These functions are used to convert the text item in a map rule.
  - XML functions
    There are several XML functions that you can call from component rules and map rules to process input XML data.
  - Custom functions
    From the Type Designer or Map Designer, you can create custom functions to call external libraries.
  - Date and time format strings
    You can use the listed format strings for numbers, dates and times in functions such as the CURRENTDATETIME, FROMNUMBER, TONUMBER, FROMDATETIME, and TODATETIME.
  - Number format strings
    You can create custom number formats by using the given format strings.
  - RUN function return codes
    The RUN function return codes and messages might result when using the RUN function.
  - Character set codes for CPACKAGE, CSERIESTOTEXT, and CTEXT
    The second argument of the CPACKAGE, CSERIESTOTEXT, and CTEXT functions specifies the character set of the output of the function. The value of the second argument (the character set of the object content), must be a valid character set code.
Notices

ATAN2

The ATAN2 function calculates the arctangent of y,x.

Syntax:: mathlib->ATAN2 (single-number-expression, single-number-expression)
Meaning:: mathlib->ATAN2 (number_to_convert)
Returns:: A single number item