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Argumentos de entrada y salida

Admitir listas de argumentos de longitud variable, comprobar argumentos, declarar argumentos de validación

Las funciones pueden aceptar números variables de entradas y salidas mediante una sola firma de función. MATLAB^® ofrece numerosas técnicas para comprobar el número, el tipo, el tamaño y otros aspectos de las entradas para garantizar que las funciones funcionan como se espera, para proporcionar mensajes de error útiles en los casos en que las entradas no sean válidas.

Funciones

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Lista de argumentos variables

`nargin`	Number of function input arguments
`nargout`	Number of function output arguments
`varargin`	Variable-length input argument list
`varargout`	Variable-length output argument list

Comprobar argumentos

`narginchk`	Validate number of input arguments
`nargoutchk`	Validate number of output arguments
`validateattributes`	Check validity of array
`validatestring`	Check validity of text
`inputParser`	Input parser for functions
`inputname`	Variable name of function input
`mfilename`	File name of currently running code

Declarar argumentos de validación

Bloques de argumentos

`arguments`	Declare function argument validation
`namedargs2cell`	Convert structure containing name-value pairs to cell array

Funciones de validación

`mustBeFinite`	Validate that value is finite or issue error
`mustBeGreaterThan`	Validate that value is greater than another value or issue error
`mustBeGreaterThanOrEqual`	Validate that value is greater than or equal to another value or issue error
`mustBeInteger`	Validate that value is integer or issue error
`mustBeLessThan`	Validate that value is less than another value or issue error
`mustBeLessThanOrEqual`	Validate that value is less than or equal to another value or issue error
`mustBeMember`	Validate that value is member of specified set
`mustBeNegative`	Validate that value is negative or issue error
`mustBeNonempty`	Validate that value is nonempty or issue error
`mustBeNonNan`	Validate that value is nonNaN
`mustBeNonnegative`	Validate that value is nonnegative or issue error
`mustBeNonpositive`	Validate that value is nonpositive or issue error
`mustBeNonsparse`	Validate that value is nonsparse or issue error
`mustBeNonzero`	Validate that value is nonzero or issue error
`mustBeNumeric`	Validate that value is numeric or issue error
`mustBeNumericOrLogical`	Validate that value is numeric or logical or issue error
`mustBePositive`	Validate that value is positive or issue error
`mustBeReal`	Validate that value is real or issue error

Temas

Comprobar número de argumentos

Find Number of Function Arguments

Use nargin and nargout to determine how many input or output arguments your function receives.

Support Variable Number of Inputs

Define a function that accepts a variable number of input arguments using varargin. The varargin argument is a cell array that contains the function inputs, where each input is in its own cell.

Support Variable Number of Outputs

Define a function that returns a variable number of output arguments using varargout. Output varargout is a cell array that contains the function outputs, where each output is in its own cell.

Validate Number of Function Arguments

Check if your custom function receives a valid number of input or output arguments. MATLAB performs some argument checks automatically. For other cases, you can use narginchk or nargoutchk.

Argument Checking in Nested Functions

There are special considerations for using varargin, varargout, nargin, and nargout with nested functions.

Ignore Function Inputs

If your function accepts a predefined set of inputs, but does not use all the inputs, use the tilde (~) operator to ignore them in your function definition.

Ignorar los valores de salida de una función

Este ejemplo muestra cómo solicitar valores de salida específicos de una función.