Making a nested function in within a script for a call back function

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Amanda 2022-11-11

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评论： Mohsin Zubair 2022-11-14

I am learning how to program a GUI programatically. I have a script called plotburst that i need to write a nested function called randomize within. I want to set randomizr as the callback function for my button. I also need to set the postion and apperance of a plotted data point to random values. I'm not sure on how to even start this problem if you could help that would be great.

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Amanda 2022-11-11

编辑：Jan 2022-11-11

在 MATLAB Online 中打开

f= figure;
ax= axes('Parent',f,'Position',[0.05, 0.25, 0.9, 0.7]);
xlim = [0 1];
ylim = [0 1];
x = 0.25;
y = 0.55;
point_plot_handle = plot(x,y,'d','MarkerFaceColor','m','MarkerSize',75);
hold on;
my_button = uicontrol('style','pushbutton');
set(my_button, 'units', 'normalized', 'position', [0.05,0.05,0.3,0.15])
set(my_button, 'string','Add Point')
my_second_button = uicontrol('style','pushbutton');
set(my_second_button, 'units', 'normalized', 'position', [0.35,0.05,0.3,0.15])
set(my_second_button, 'string', 'Clear')
my_third_button = uicontrol('style', 'pushbutton');
set(my_third_button, 'units', 'normalized','position', [0.65,0.05,0.3,0.15])
set(my_third_button, 'string', 'Randomize')
set(my_third_button, 'callback', @sayrandomize)

This is what I have so far. I am aware that app designer would be easier but it for an assingment and this is how my professor has asked us to do it. I would just like some help not saracasm, thanks in advance

Walter Roberson 2022-11-12

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@Jan

Nested functions are permitted within scripts, as long as they are nested within a function.

try_experiment()
ans = 62
function result = try_experiment
   shared_variable = 0;
   for K = 1 : 5; try_nested(); end
   result = shared_variable;
   
    function try_nested
        shared_variable = (shared_variable + 1) * 2;
    end
end

Jan 2022-11-12

在 MATLAB Online 中打开

@Walter Roberson: Thanks for the clarification.

@Amanda: "It is suppose to be a nested function 'randomize' within 'plotBurst'" - So start to write 'plotBurst' t first.

"I need to set the position and appearance of the plotted data point to random values with a reasonable range" - I cannoit guess, what you calle "the plotted data point".

The explanations are too abstract to suggest some specific code. So just a general hint: I think it is easier to read, if the parameters of a uicontrol are set directly. Compare:

my_third_button = uicontrol('style', 'pushbutton');
set(my_third_button, 'units', 'normalized','position', [0.65,0.05,0.3,0.15])
set(my_third_button, 'string', 'Randomize')
set(my_third_button, 'callback', @sayrandomize)

with

my_third_button = uicontrol('style', 'pushbutton', 'string', 'Randomize', ...
              'units', 'normalized','position', [0.65, 0.05, 0.3, 0.15], ...
              'callback', @sayrandomize);

Simpler code reduces the chance to insert typos and increases the chance to find them.

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Answer 1

Mohsin Zubair 2022-11-11

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1848763-making-a-nested-function-in-within-a-script-for-a-call-back-function#answer_1097353

编辑：Mohsin Zubair 2022-11-11

在 MATLAB Online 中打开

Not sure about the content of your code so can't answer the later part but for 1st part about to create a button and assign a userdefined function as its call back you can do it like this:

f=uifigure;
uibutton(f,"ButtonPushedFcn",@randamize);

You can set position of button using "Position" property in above line.

But for working with GUI I woud suggest use App Designer instead.

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Amanda 2022-11-11

I have posted my code above if that helps

Mohsin Zubair 2022-11-14

@Amanda @Jan has explained it much better already

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