How to pass Optional-Positional arguments to a function in matlab

Question

Rukmangadh Sai Myana 2019-1-8

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/438710-how-to-pass-optional-positional-arguments-to-a-function-in-matlab

回答： Vishal Chaudhary 2019-1-11

I am trying to understand the usage of positional arguments in MATLAB and I was referring to this page.

Let's say I have a MATLAB function defined as follows:

    function printPhoto(filename,varargin)
        p = inputParser;
        defaultFinish = 'glossy';
        validFinishes = {'glossy','matte', 'colorful'};
        checkFinish = @(x) any(validatestring(x,validFinishes));
        defaultColor = 'RGB';
        validColors = {'RGB','CMYK','colorful'};
        checkColor = @(x) any(validatestring(x,validColors));
        defaultWidth = 6;
        defaultHeight = 4;
        addRequired(p,'filename',@ischar);
        addOptional(p,'finish',defaultFinish,checkFinish);
        addOptional(p,'color',defaultColor,checkColor);
        addParameter(p,'width',defaultWidth,@isnumeric);
        addParameter(p,'height',defaultHeight,@isnumeric);
        parse(p,filename,varargin{:});
    end

When I call the above function as follows:

printphoto('myFile.img', 'colorful')

Is it possible to make this second argument to correspond to the second optional positional argument in the function definition i.e. color='colorful' and not finish='colorful' ?