如何在 MATLAB 中为函数参数设置默认值? [英] How do I set default values for functions parameters in MATLAB?

问题描述

是否可以在 MATLAB 中使用默认参数?

Is it possible to have default arguments in MATLAB?

例如，这里:

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

我希望真正的解决方案是波函数的可选参数.如果可能，这样做的正确方法是什么?

I would like to have the true solution be an optional argument to the wave function. If it is possible, what is the proper way to do this?

目前，我正在尝试上面发布的内容，我得到了:

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

没有像您尝试过的那样直接的方法.

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

通常的方法是使用varargs"并检查参数的数量.类似的东西:

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 等来做一些更有趣的事情，并且您可能需要查看 MATLAB central 中的一些捆绑这些类型的东西的包.

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.

您可能会查看varargin、nargchk 等.它们是处理此类事情的有用函数.varargs 允许您保留可变数量的最终参数，但这并不能解决某些/所有参数的默认值问题.

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.

这篇关于如何在 MATLAB 中为函数参数设置默认值?的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！