String Length

R2026b

Output number of characters in input string

• 

String Length block

To add a block to a model, double-click the canvas and start typing the block name. Then, select the block from the list.

Libraries:
Simulink / String

Description

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.

Ports

Input

Port_1 — Input string

scalar

Input string, specified as a scalar.

Data Types: string

Output

Port_1 — Number of characters

scalar

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

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

Parameters

Output data type — Output data type

Inherit: Inherit via internal rule (default) | Inherit: Inherit via back propagation | int8 | uint8 | int16 | uint16 | int32 | uint32 | <data type expression>

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'

Mode — Category of data type

Inherit (default) | Built in | Expression

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.

Dependency

Clicking the Show data type assistant button enables this parameter.

Block Characteristics

Data Types	integer | string
Direct Feedthrough	yes
Multidimensional Signals	no
Variable-Size Signals	no
Zero-Crossing Detection	no

Programmatic Use: Add Block

To add the block programmatically, use the add_block function with one of these library block paths as the source.

"simulink/String/String Length"

Example: add_block("simulink/String/String Length","myModel/myBlock",MakeNameUnique="on")

Extended Capabilities

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

HDL Code Generation

Generate VHDL, Verilog and SystemVerilog code for FPGA and ASIC designs using HDL Coder™.

HDL Coder™ provides additional configuration options that affect HDL implementation and synthesized logic.

HDL Architecture

This block has one default HDL architecture.

HDL Block Properties

ConstrainedOutputPipeline	Number of registers to place at the outputs by moving existing delays in the design. Distributed pipelining does not redistribute these registers. The default value is 0. For more details, see ConstrainedOutputPipeline (HDL Coder).
InputPipeline	Number of input pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default value is 0. For more details, see InputPipeline (HDL Coder).
OutputPipeline	Number of output pipeline stages to insert in the generated code. Distributed pipelining and constrained output pipelining can move these registers. The default value is 0. For more details, see OutputPipeline (HDL Coder).
SynthesisAttributes	Specifies the synthesis attributes for the blocks and block output signals in the model. The generated HDL code contains these attributes. For more information, see SynthesisAttributes (HDL Coder).

Version History

Introduced in R2018a

R2026a: Specify synthesis attributes for blocks and block output signals

Use the SynthesisAttributes HDL block property to specify the synthesis attributes for the block and its output signals. HDL Coder includes these attributes in the generated HDL code.