Validate Name-Value Arguments - MATLAB & Simulink - MathWorks United Kingdom (2024)

FAQs

What to do when MATLAB says not enough input arguments? ›

your function needs to be called with at least three input arguments. Therefore you must call it with exactly three input arguments. From the text of the error message you're likely calling it with fewer than three input arguments.

Name-value arguments support partial name matching when there is no ambiguity. For example, a function that defines LineWidth and LineStyle as its two name-value arguments accepts LineW and LineS , but using Line results in an error.

Function argument validation is a way to declare specific restrictions on function arguments. Using argument validation you can constrain the class, size, and other aspects of arguments without writing code in the body of the function to perform these tests.

You can specify the class, size, and other aspects of input variables in your entry-point MATLAB function by using arguments blocks to perform function argument validation. Specifying input types using arguments blocks supports: Numeric, logical, half, character, string, and enumeration data types.

If you are unfamiliar with the problem, right-click the highlighted code. The first item in the context menu shows the suggested fix. Select the item to apply the fix. If multiple instances of a problem exist, MATLAB might offer to apply the suggested fix for all instances of the problem.

Too many input arguments

This error message means that you are providing more input variables into a function than it is designed to handle.

For example, if you create a function named myplot with repeating arguments X , Y , and style , the function accepts multiple sets of these three arguments, such as myplot(x1,y1,style1,x2,y2,style2) . MATLAB creates a cell array that contains all the values passed in for that argument.

An argument-based approach to validation redresses the balance by linking the kinds of evidence needed to validate a test-score interpretation to the details of the interpretation.

Input validation can be implemented using any programming technique that allows effective enforcement of syntactic and semantic correctness, for example: Data type validators available natively in web application frameworks (such as Django Validators, Apache Commons Validators etc).

How to check type of value in MATLAB? ›

Different types of input validation can be used, including data type validation, range validation, format validation, and consistency validation. By following best practices for implementing input validation, we can build more accurate and secure machine learning models.

arguments ... end declares input arguments for a function. The arguments block is optional. If you include one or more arguments blocks, they must appear before the first executable line of the function. MATLAB^® treats any argument block that is not labeled explicitly with Input or Output as an input block.

x = input( prompt ) displays the text in prompt and waits for the user to input a value and press the Return key. The user can enter expressions, like pi/4 or rand(3) , and can use variables in the workspace. If the user presses the Return key without entering anything, then input returns an empty matrix.

To add input arguments to an app, open the app in App Designer and click Code View. Then click App Input Arguments in the Editor tab. This launches the App Details dialog box. Use the Input Arguments field in the dialog box to add or remove input arguments in the function signature of the startupFcn callback.

MATLAB lets you ignore arguments by passing a tilde character ( ~ ) in place of the argument. You can define a function that ignores unused positional arguments by adding a tilde character ( ~ ) in the arguments block corresponding to the position of the argument in the function signature.