Action Language Syntax

Use MATLAB or C as the action language with operators, data types, and built-in functions to control state and transition behavior in Stateflow charts

Create charts that use MATLAB or C as the action language in states and transitions. C charts support zero-based array indexing, binary and bitwise operations, and common C language syntax abbreviations.

Functions

sfpref Set preferences for Stateflow charts

Stateflow Syntax

expand all

Operators

Change Detection

`hasChanged`	Detect change in data since last time step in Stateflow chart
`hasChangedFrom`	Detect change in data from specified value in Stateflow chart
`hasChangedTo`	Detect change in data to specified value in Stateflow chart
`change`	Generate implicit event when data changes value in Stateflow chart

Edge Detection

`crossing`	Detect rising or falling edge in data since last time step in Stateflow chart
`falling`	Detect falling edge in data since last time step in Stateflow chart
`rising`	Detect rising edge in data since last time step in Stateflow chart

Message Activity

`send`	Broadcast message or event
`receive`	Extract message from queue
`discard`	Discard message
`forward`	Forward message
`isvalid`	Determine if message is valid
`length`	Determine length of message queue

State Activity

`in`	Check state activity
`enter`	Generate implicit event when state becomes active
`exit`	Generate implicit event when state becomes inactive

Data Type Conversion

cast	Convert numeric value to different numeric data type
`boolean`	Convert numeric value to Boolean value
`ascii2str`	Convert array of type `uint8` to string
`str2ascii`	Convert string to array of type `uint8`
`str2double`	Convert string to double-precision value in Stateflow chart
`string`	Convert value to string in Stateflow chart
`tostring`	Convert value to string
`type`	Type of Stateflow data object

String Creation and Concatenation

`blanks`	Character array of spaces
`plus`	Concatenate strings in Stateflow chart
`strcpy`	Assign string value
`strcat`	Concatenate strings

Properties of String Data

`isletter`	Determine which characters are letters in Stateflow chart
`isspace`	Determine which characters are spaces in Stateflow chart
`isstring`	Determine if input is string in Stateflow chart
`strlen`	Determine length of string
`strlength`	Determine length of string in Stateflow chart

Find and Replace Substrings

`contains`	Determine if string contains substring in Stateflow chart
`startsWith`	Determine if string starts with substring in Stateflow chart
`endsWith`	Determine if string ends with substring in Stateflow chart
`strfind`	Find substring within a string in Stateflow chart
`extractAfter`	Extract substring after position in Stateflow chart
`extractBefore`	Extract substring before position in Stateflow chart
`substr`	Extract substring from string
`replace`	Find and replace substrings in Stateflow chart
`replaceBetween`	Replace substrings between start and end points in Stateflow chart
`strrep`	Find and replace substrings in Stateflow chart
`erase`	Delete substrings within strings in Stateflow chart
`eraseBetween`	Delete substring between start and end points in Stateflow chart
`insertAfter`	Insert string after substring in Stateflow chart
`insertBefore`	Insert string before substring in Stateflow chart

Edit String Data

`lower`	Convert string to lowercase in Stateflow chart
`upper`	Convert a string to uppercase in Stateflow chart
`reverse`	Reverse order of characters in strings in Stateflow chart
`strip`	Remove leading and trailing characters from string in Stateflow chart
`strtrim`	Remove leading and trailing white space from string in Stateflow chart

Compare String Data

`matches`	Determine if two strings match in Stateflow chart
`strcmp`	Compare strings in Stateflow chart (case sensitive)
`strcmpi`	Compare strings in Stateflow chart (case insensitive)
`strncmp`	Compare first N characters of strings in Stateflow chart (case sensitive)
`strncmpi`	Compare first N characters of strings in Stateflow chart (case insensitive)

Temporal Logic

`after`	Execute chart after event broadcast or specified time
`at`	Execute chart at event broadcast or specified time
`before`	Execute chart before event broadcast or specified time
`every`	Execute chart at regular intervals
`duration`	Time during which condition is valid in Stateflow chart
`elapsed`	Time since state became active
`count`	Number of chart executions during which condition is valid
`temporalCount`	Number of events, chart executions, or time since state became active

Interface with MATLAB Code

this Access chart data during simulation

Topics

Differences Between MATLAB and C as Action Language Syntax
Compare the functionality of the chart action languages.
Modify the Action Language for a Chart
Change the action language property of a chart.
Operations for Stateflow Data

Perform mathematical computations in Stateflow^® charts.
Access MATLAB Functions and Workspace Data in C Charts
Call built-in MATLAB^® functions by using the ml operator.
Call C Library Functions
Access C functions in state and transition labels.