Specifying parameters for varargin

I have a function that plots data using varargin as an input. Varargin can contain at least one of the following but nothing else - 'tomatoes', 'carrots', 'lettuce', 'blueberries', 'strawberries'. I have data relating to each one of these options that will be plotted. I can't figure out how to get it so the function will only accept inputs with some kind of combination of these. It has to be case insensitive so I know I have to use strcmpi, but I don't really know how to work with varargin

Answer 1

[Matthew Eicholtz]

Here's an example...

function fruitsandveggies(varargin)
    validinputs = {'tomatoes', 'carrots', 'lettuce', 'blueberries', 'strawberries'};
    mask = ismember(lower(varargin),lower(validinputs));
    if ~all(mask)
        error('Valid inputs are: %s',sprintf('%s ',validinputs{:}));
    end

    % insert additional code here

end

In this case, if the user enters one or more invalid inputs, the function gives an error.

fruitsandveggies('carrots') %works
fruitsandveggies('Strawberries','TOMATOES') %works
fruitsandveggies('carrots','lettuce','peas') %gives an error!

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