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String Length

Output number of characters in input string

  • String Length block

Simulink / String


The String Length block outputs the number of characters in the input string. For example, you can use the String Length block to move focus of attention to a particular location in a string.



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Input string, specified as a scalar.

Data Types: string


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Number of characters in the input string, specified as a scalar.

Data Types: int8 | uint8 | int16 | uint16 | int32 | uint32


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Output data type. The type can be inherited, specified directly, or expressed as a data type object such as Simulink.NumericType.

When you select an inherited option, the block exhibits these behaviors:

  • Inherit: Inherit via internal rule — Simulink® chooses a data type to balance numerical accuracy, performance, and generated code size, while taking into account the properties of the embedded target hardware.

  • Inherit: Inherit via back propagation — Use data type of the driving block.

Click the Show data type assistant button to display the Data Type Assistant, which helps you set the data type attributes. See Specify Data Types Using Data Type Assistant for more information.

Programmatic Use

Block Parameter: OutDataTypeStr
Type: character vector
Values: 'Inherit: Inherit via internal rule' | 'Inherit: Inherit via back propagation' | 'int8' | 'uint8' | 'int16' | 'uint16' | 'int32' | 'uint32' | <data type expression>
Default: 'Inherit: Inherit via internal rule'

Category of data type, specified as Inherit, Built in, or Expression. For more information on using this parameter, see Specify Data Types Using Data Type Assistant.


Clicking the Show data type assistant button enables this parameter.

Block Characteristics

Data Types

integer | string

Direct Feedthrough


Multidimensional Signals


Variable-Size Signals


Zero-Crossing Detection


Extended Capabilities

C/C++ Code Generation
Generate C and C++ code using Simulink® Coder™.

Version History

Introduced in R2018a