MATLAB 函数中的可选参数 [英] Optional args in MATLAB functions

问题描述

如何使用可选参数在 MATLAB 中声明函数?

How can I declare function in MATLAB with optional arguments?

例如:function [a] = train(x, y, opt)，其中 opt 必须是可选参数.

For example: function [a] = train(x, y, opt), where opt must be an optional argument.

推荐答案

关于如何执行此操作，有几个不同的选项.最基本的就是使用varargin，然后使用nargin、size等来判断可选参数是否已经传递给函数.

There are a few different options on how to do this. The most basic is to use varargin, and then use nargin, size etc. to determine whether the optional arguments have been passed to the function.

% Function that takes two arguments, X & Y, followed by a variable 
% number of additional arguments
function varlist(X,Y,varargin)
   fprintf('Total number of inputs = %d\n',nargin);

   nVarargs = length(varargin);
   fprintf('Inputs in varargin(%d):\n',nVarargs)
   for k = 1:nVarargs
      fprintf('   %d\n', varargin{k})
   end

一个看起来更优雅的解决方案是使用 inputParser 类来定义函数所需的所有参数，包括必需的和可选的.inputParser 还允许您对所有参数执行类型检查.

A little more elegant looking solution is to use the inputParser class to define all the arguments expected by your function, both required and optional. inputParser also lets you perform type checking on all arguments.

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