将varargs传递给plot()函数 [英] Passing varargs to plot() function

问题描述

我正在为 plot 写一个包装程序，该程序可以自动执行我发现自己经常执行的某些任务.

I am writing a wrapper for plot that automates some tasks that I find myself doing frequently.

示例代码段可能如下所示

An example code snippet might look like

function myplot(x,y,varargin)
    plot(x,y,varargin{:})
    xlabel('x axis')
    ylabel('y axis')
end

我正在使用Matlab的 varargin 将其他参数传递给 plot .但是，我发现我可能想在varargin中传递自己的可选参数.例如，我可能想写类似

I'm using Matlab's varargin to pass additional arguments to plot. However, I find that I might want to pass my own optional arguments in varargin. For example, I might want to write something like

>> myplot(1:10, 1:10, 'r', 'LineWidth', 2, 'legend', {'Series 1'})

使函数自动在图例中包含图例-也就是说，我希望能够将自己的关键字参数与可以提供给图例的参数相混合.除了没有为我的varargs编写完整的解析器之外，还有什么方法可以在Matlab中简单且可重复使用?

to have the function automatically include a legend in the plot - that is, I want to be able to mix my own keyword arguments with the ones that you can supply to plot. Short of writing a full parser for my varargs, is there a way to do this simply and reusably in Matlab?

我尝试使用 inputParser 对象，但这需要我手动将所有可能的附加参数添加到 plot(以及它的默认值)，这似乎并不理想.

I've tried to use the inputParser object, but that would require me to manually add every possible additional argument to plot (and a default for it) which doesn't seem ideal.

推荐答案

inputParser 可能仍然是最佳选择.您可以为其他参数构造对象，然后将要传递给 plot 的所有parameterName/parameterValue对合并为 Unmatched .

inputParser may still be the best choice. You can construct the object for your additional arguments, and lump all the parameterName/parameterValue pairs that you want to pass to plot into Unmatched.

function myplot(x,y,varargin)

    parserObj = inputParser;
    parserObj.KeepUnmatched = true;
    parserObj.AddParamValue('legend',false); 
    %# and some more of your special arguments

    parserObj.parse(varargin);

    %# your inputs are in Results
    myArguments = parserObj.Results;

    %# plot's arguments are unmatched
    tmp = [fieldnames(parserObj.Unmatched),struct2cell(parserObj.Unmatched)];
    plotArgs = reshape(tmp',[],1)'; 


    plot(x,y,plotArgs{:})
    xlabel('x axis')
    ylabel('y axis')

    if myArguments.legend
       %# add your legend
    end
end

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