如何在Matlab中为函数参数设置默认值?

问题描述

在Matlab中是否可以使用默认参数?例如，在这里:

Is it possible to have default arguments in Matlab? For instance, here:

function wave(a, b, n, k, T, f, flag, fTrue=inline('0'))

我想让真正的解决方案成为wave函数的可选参数.如果有可能，任何人都可以演示执行此操作的正确方法吗?目前，我正在尝试上面发布的内容，并且得到了:

I would like to have the true solution be an optional argument to the wave function. If it is possible, can anyone demonstrate the proper way to do this? Currently, I am trying what I posted above and I get:

??? Error: File: wave.m Line: 1 Column: 37
The expression to the left of the equals sign is not a valid target for an assignment.

推荐答案

没有像您尝试的那样直接执行此操作的方法.

There isn't a direct way to do this like you've attempted.

通常的方法是使用"varargs"并对照参数数量进行检查.像这样:

The usual approach is to use "varargs" and check against the number of arguments. Something like:

function f(arg1, arg2, arg3)

  if nargin < 3
    arg3 =   'some default'
  end

end

您可以使用isempty做一些更奇妙的事情，等等，并且您可能想看看Matlab Central来找到一些捆绑了这些事情的软件包.

There are a few fancier things you can do with isempty, etc., and you might want to look at Matlab central for some packages that bundle these sorts of things.

您可能会看到varargin，nargchk等.它们对于这类事情很有用. varargs允许您保留可变数量的最终参数，但这并不能解决某些/全部默认值的问题.

You might have a look at varargin, nargchk, etc. They're useful functions for this sort of thing. varargs allow you to leave a variable number of final arguments, but this doesn't get you around the problem of default values for some/all of them.

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