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Compose String

Compose output string signal based on specified format and input signals

  • Library:
  • Simulink / String

Description

The Compose String block composes output string signal based on the format specifier listed in the Format parameter. The Format parameter determines the number of input signals. If there are multiple inputs, the block constructs the string by combining these multiple inputs in order, and applying the associated format specifier, one format specifier for each input. Each format specifier starts with a percent sign, %, followed by the conversion character. For example, %f formats the input as a floating point output. To supplement the string output, you can also add a character to the format specification. Use this block to compose and format an output string signal from a multiple inputs.

For example, if the Format parameter contains "%s is %f", the block expects two inputs, a string signal and a single or double signal. If the first input is the string "Pi" and the second input is a double value 3.14, the output is "Pi is 3.14".

When a MinGW® compiler compiles code generated from the block, running the compiled code may produce nonstandard results for floating-point inputs. For example, a numeric input of 501.987 returns the string "5.019870e+002" instead of the expected string "5.019870e+02".

Ports

Input

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Data for the first part of string, specified as a scalar. The Format parameter determines the port label and the format of the input data. For example, if the first item in the Format parameter is %d, the port label is d.

The data type of the input signal must be compatible with the format specifier in the Format parameter. For more information, see the Format parameter.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean

Data for the second part of string, specified as a scalar. The Format parameter determines the port label and the format of the input data. For example, if the first item in the Format parameter is %f, the port label is f.

The data type of the input signal must be compatible with the format specifier specified in the Format parameter. For more information, see the Format parameter.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point | enumerated | bus

Data for N parts of string, specified as a scalar. The Format parameter determines the port label and the format of the input data. For example, if the corresponding item in the Format parameter is %f, the port label is f.

The data type of the input signal must be compatible with the format specifier in the Format parameter. For more information, see the Format parameter.

Data Types: single | double | int8 | int16 | int32 | uint8 | uint16 | uint32 | Boolean | fixed point | enumerated | bus

Output

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Output string composed of inputs, specified as a scalar.

Data Types: string

Parameters

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Format of input data, specified as a scalar.

For more information about acceptable format specifiers, see the Algorithms section.

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, specify stringtype(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. See Specify Data Types Using Data Type Assistant for more information.

Block Characteristics

Data Types

double | single | base integer | string

Direct Feedthrough

No

Multidimensional Signals

No

Variable-Size Signals

No

Zero-Crossing Detection

No

Algorithms

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A formatting specifier starts with a percent sign, %, and ends with a conversion character. The conversion character is required. Optionally, you can specify identifier, flags, field width, precision, and subtype specifiers between % and the conversion character. (Spaces are invalid between specifiers and are shown here only for readability).

The Compose String block uses this format specifier prototype:

%[flags][width][.precision][length]specifier

Extended Capabilities

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

Introduced in R2018a