Substring - Extract substring from input string signal - Simulink (original) (raw)
Main Content
Extract substring from input string signal
Libraries:
Simulink / String
Description
The Substring block extracts a substring from the input string signal. The block extracts the substring starting from the letter corresponding toidx and includes a len number of characters starting at idx. For example, if the input string is"hello 123", input idx is1, and input len is 5, the output is "hello". The block extracts a substring starting at1 and the next 4 characters for a total of 5 characters (hello).
Ports
Input
Input string signal, specified as a string.
Data Types: string
Start of string to extract, specified as a positive scalar integer.
Data Types: int8 | int16 | int32 | uint8 | uint16 | uint32
Length of string to extract, specified as a scalar. If len causes the substring to extend beyond the end of the string, the output signal contains few than len characters.
Data Types: uint8 | uint16 | uint32
Output
Extracted string, specified as a scalar.
Data Types: string
Parameters
Use same maximum length as the input string source block.
on
Use same maximum length. The substring includes the characters starting from the character atidx to the end of the string.
off
Do not use same maximum length.
Dependencies
Selecting this check box enables the Output data type parameter.
Programmatic Use
| Block Parameter: InheritMaximumLength |
|---|
| Type: character vector |
| Values: 'on' | 'off' |
| Default: 'on' |
Output data type, specified using the string data type to specify a string with no maximum length.
To specify a string data type with a maximum length, specifystringtype(_`N`_). For example, stringtype(31) creates a string data type with a maximum length of 31 characters.
Click the Show data type assistant button 
to display the Data Type Assistant, which helps you set the data type attributes. SeeSpecify Data Types Using Data Type Assistant for more information.
Dependencies
To enable this parameter, select Inherit maximum length from input.
Programmatic Use
| Block Parameter: OutDataTypeStr |
|---|
| Type: character vector |
| Values: 'string' | |
| Default: 'string' |
Extract string from idx to end of input string.
on
Extract string from idx to end of input string.
off
Do not extract string from idx to end of input string.
Dependencies
Selecting this parameter removes the third input port.
Programmatic Use
| Block Parameter: StringFromIdxToEnd |
|---|
| Type: character vector |
| Values: 'on' | 'off' |
| Default: 'off' |
Block Characteristics
| Data Types | integer | string |
|---|---|
| Direct Feedthrough | yes |
| Multidimensional Signals | no |
| Variable-Size Signals | no |
| Zero-Crossing Detection | no |
Extended Capabilities
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 within your design. Distributed pipelining does not redistribute these registers. The default is0. 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 is0. 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 is0. For more details, see OutputPipeline (HDL Coder). |
Version History
Introduced in R2018a