# Difference between revisions of "Expressions"

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− | + | This section explains how to write expressions in the Analytica language, such as | |

− | :<code>(-B + Sqrt(B^2 - 4*A*B))/(2*A)</code> | + | :<code>(-B + Sqrt(B^2 - 4*A*B))/(2*A)</code> |

− | An expression can | + | You use expressions in the Definition of a Variable or Function to say how to calculate. An expression can be simply a literal [[Numbers|number]], including [[Boolean or truth values|Boolean]] or [[Date and Time Values|date]], a [[Text values|text value]], or an identifier of a variable. Or it could be an arithmetic [[Operators|expression, a comparison or logical expression]], [[IF a THEN b ELSE c]], or a [[Function calls and parameters|function call]], such as <code>Sqrt(B)</code>. |

− | + | Analytica is primarily a [[Declarative language]], where the Definition of each variable is a simple expressions. But Analytica does support constructs used in common procedural or imperative languages like Python or C++, including <code>BEGIN ... END </code> statements, [[For]] and [[While]] loops, local variables, assignments, references and data Structures, and handles to objects. See [[Procedural Programming]] for details. | |

==Sections== | ==Sections== | ||

Line 26: | Line 26: | ||

==See Also== | ==See Also== | ||

+ | * [[Expression Syntax]] | ||

* [[Parsed Expressions]] | * [[Parsed Expressions]] | ||

* [[Expression Assist]] | * [[Expression Assist]] | ||

* [[The Expression popup menu]] | * [[The Expression popup menu]] | ||

− | * [[ | + | * [[Tutorial: Arrays#Using_local_variables_and_indexes_in_an_expression|Tutorial: Using local variables and indexes in an expression]] |

− | <footer> | + | <footer>Definitions / {{PAGENAME}} / Text, Date, Math, and Financial Functions</footer> |

## Latest revision as of 02:26, 13 October 2017

This section explains how to write expressions in the Analytica language, such as

`(-B + Sqrt(B^2 - 4*A*B))/(2*A)`

You use expressions in the Definition of a Variable or Function to say how to calculate. An expression can be simply a literal number, including Boolean or date, a text value, or an identifier of a variable. Or it could be an arithmetic expression, a comparison or logical expression, IF a THEN b ELSE c, or a function call, such as `Sqrt(B)`

.

Analytica is primarily a Declarative language, where the Definition of each variable is a simple expressions. But Analytica does support constructs used in common procedural or imperative languages like Python or C++, including `BEGIN ... END `

statements, For and While loops, local variables, assignments, references and data Structures, and handles to objects. See Procedural Programming for details.

## Sections

- Numbers
- Date and Time Values
- Boolean or truth values
- Text values
- Operators
- IF a THEN b ELSE c
- Function calls and parameters
- Math functions
- Numbers and text
- INF, NAN, and NULL - Exception values
- Warnings
- Datatype functions

## See Also

- Expression Syntax
- Parsed Expressions
- Expression Assist
- The Expression popup menu
- Tutorial: Using local variables and indexes in an expression

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