在Matlab默认参数 [英] Default Arguments in Matlab

问题描述

时有可能有默认参数在Matlab？举例来说，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'))

我想有真正的解决方案是一个可选的参数波函数。如果可能的话，任何人都可以证明正确的方式做到这一点？目前，我想我上面张贴，我得到：

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.

谢谢！

推荐答案

据我所知，没有一个直接的方式来做到这一点，就像你尝试。

As far as I know, there isn't a direct way to do this like you've attempted.

通常的方法是使用可变参数和对证args来数。是这样的：

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

function f(arg1,arg2,arg3)

  if nargin < 3
    arg3 =   'some default'
  end

end

有几个票友东西，你可以用的isEmpty等做的，你可能想看看MATLAB中心为一些软件包捆绑这些事情。

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.

[更新]
高兴的是帮助。

[update] glad that helped.

您可以看看varargin，nargchk等，他们对这种事有用的功能。可变参数让你离开可变数量的最终参数，但是，这并不让你周围的一些/所有这些默认值的问题。

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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