Specify String Scalar Inputs at the Command Line

You can specify string scalar input types by using the codegen command with -args at the command line. Alternatively, you can specify input types by using function argument validation in your MATLAB^® code, by using the MATLAB Coder™ app, or by using assert statements in your MATLAB code. For an overview of these four methods of input type specification, see Specify Types of Entry-Point Function Inputs.

To define string scalar inputs at the command line, use one of these procedures:

Alternatively, if you have a test file that calls your entry-point function with example inputs, you can determine the input types by using coder.getArgTypes.

Provide an Example String Scalar Input

To provide an example string scalar to codegen, use the -args option:

codegen myFunction -args {"Hello, world"}

Provide a String Scalar Type

To provide a type for a string scalar to codegen:

Define a string scalar. For example:
```
s = "mystring";
```
Create a type from s.
```
t = coder.typeof(s);
```
Pass the type to codegen by using the -args option.
```
codegen myFunction -args {t}
```

Provide a Constant String Scalar Input

To specify that a string scalar input is constant, use coder.Constant with the -args option:

codegen myFunction -args {coder.Constant("Hello, world")}

Provide a Variable-Size String Scalar Input

To specify that a string scalar input has a variable-size:

Define a string scalar. For example:
```
s = "mystring";
```
Create a type from s.
```
t = coder.typeof(s);
```
Assign the StringLength property of the type the upper bound of the string length and set VariableStringLength to true. For example, specify that type t is variable-size with an upper bound of 10.
```
t.StringLength = 10;
t.VariableStringLength = true;
```
To specify that t is variable-size with no upper bound:
```
t.StringLength = Inf;
```
This automatically sets the VariableStringLength property to true.
Pass the type to codegen by using the -args option.
```
codegen myFunction -args {t}
```