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String to Double

Convert string signal to double signal

  • Library:
  • Simulink / String

Description

Scan String scans an input string and converts it to signals per the format specified by the Format parameter. The block converts values to their decimal (base 10) representation and outputs the results as numeric or string signals. For example, if the Format parameter is set to "%s is %f.", the block outputs two parts, a string signal and a single signal. If the input is the string "Pi is 3.14", the two outputs are "Pi" and "3.14".

The Scan String, String to Double, and String to Single blocks are identical blocks. When configured for String to Double, the block converts the input string signal to a double numerical output. When configured for String to Single, the block converts the input string signal to a single numerical output.

For code generation, configure models that contain this block for non-finite number support by selecting the Configuration Parameters > Code Generation > Interface > Support non-finite numbers check box.

Ports

Input

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Input string, specified as a scalar.

Data Types: string

Output

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Output data whose format matches specified format, defined as a scalar. Total maximum number of outputs is 128.

If the block cannot match an input string to a format operator specified in Format, it returns a warning and outputs an appropriate value (0 or "") for each unmatched format operator.

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

Output data whose format matches the %f format, specified as a scalar. Total maximum number of outputs is 128.

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

Output data whose format matches N format, specified as a scalar. Total maximum number of outputs is 128.

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

Parameters

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Format operator for input, specified as a scalar. If the block cannot match the input string with the specified format, it returns 0. The return of 0 differs from the sscanf function return, which is an empty matrix if the function cannot match the input with the specified format.

  • For the String to Double block, this parameter has a default value of %lf.

  • For the String to Single block, this parameter has a default value of %f.

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

Block Characteristics

Data Types

double | integer | single | string

Direct Feedthrough

yes

Multidimensional Signals

no

Variable-Size Signals

no

Zero-Crossing Detection

no

Algorithms

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The Scan String block uses this format specifier prototype:

%[width][length]specifier

Extended Capabilities

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

Introduced in R2018a