How to write a function that returns a graph?

Question

Larry 2014-2-20

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/116996-how-to-write-a-function-that-returns-a-graph

评论： Emir Dönmez 2023-2-27

If I write a function like

 function A = myplot(x,y)
 A = plot(x,y);
 set(A，etc....)
 end

When I call this function, a lot of numbers instead of a plot are shown. If modify the code as follows,

 function A = myplot(x,y)
 plot(x,y)
 end

then an error occurs as output argument "A" is not assigned during the call to the function.

How may I correct this?

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Answer 1

Dishant Arora 2014-2-20

1
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https://ww2.mathworks.cn/matlabcentral/answers/116996-how-to-write-a-function-that-returns-a-graph#answer_125102

在 MATLAB Online 中打开

your 2nd syntex shouldn't give any error, you need to not specify output argument while calling the function from command prompt:

 a = myplot(x,y) % will result in error as a isn't defined
 myplot(x,y)   % will give you desired result

Moreover you also don't need to have any output arguments while defining the function:

 function myplot(x,y)
     %function body
 end

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Emir Dönmez 2023-2-27

在 MATLAB Online 中打开

On my project i wrote code and it works fine but i want to add a function to plot so ı'm trying to call my plot funciton without defining any output arguements. How can ı call it? I'm newbie, i basical expressions.

This is the function ı'm trying to call:

Main_path = "C:\Users\emird\AppData\Local\Programs\MatLab"
function plotter(files, Main_path)
Exceldir = Main_path + "\ExcelFiles";
cd(Exceldir); % Change current directory
for i=1:length(files)
    % Get sheet names being in the excel file.
    sheets = sheetnames(files(i).name); % Sheets array.
    
    % Get whole datas inside the excel files month by month.
    for j=1:length(sheets) 
        data = readtable(files(i).name, "Sheet", sheets(j));
        days = 1:1:size(data.Date); % Days array.
        hold on;
        plot(data.number_sold, days, "b.", "LineWidth", 2) % xAxis = sold_number
                                                           % yAxis = days
    
    end
end
hold off;
end