Error in plot(app.UIAxes)

Question

Anupriya Bhardwaj 2021-12-4

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/1602770-error-in-plot-app-uiaxes

评论： Chunru 2021-12-11

f=app.SinefrequencySlider.Value;
a=app.SineAmplitudeSlider.Value;
w=2*pi*f;
na=app.NoiseAmplitudeSlider.Value;
t=0:0.01:100*pi;
x=a*sin(w*t);
n=numel(t);
y=na*rand(1,length(t));
sine=x+y;
for i=1:n
    plot(app.UIAxes,t(1:i),sine(1:i)); %showing error in this line
    drawnow;
end

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Anupriya Bhardwaj 2021-12-11

编辑：Walter Roberson 2021-12-11

在 MATLAB Online 中打开

classdef app_4 < matlab.apps.AppBase
    
    % Properties that correspond to app components
    properties (Access = public)
        UIFigure                   matlab.ui.Figure
        frequencydomainButton      matlab.ui.control.StateButton
        NoiseAmplitudeSlider       matlab.ui.control.Slider
        NoiseAmplitudeSliderLabel  matlab.ui.control.Label
        SinefrequencySlider        matlab.ui.control.Slider
        SinefrequencySliderLabel   matlab.ui.control.Label
        SineAmplitudeSlider        matlab.ui.control.Slider
        SineAmplitudeSliderLabel   matlab.ui.control.Label
        UIAxes2                    matlab.ui.control.UIAxes
        UIAxes                     matlab.ui.control.UIAxes
    end
    
    % Callbacks that handle component events
    methods (Access = private)
        
        % Value changed function: SineAmplitudeSlider
        function SineAmplitudeSliderValueChanged(app, event)
            value = app.SineAmplitudeSlider.Value;
            f=app.SinefrequencySlider.Value;
            a=app.SineAmplitudeSlider.Value;
            w=2*pi*f;
            na=app.NoiseAmplitudeSlider.Value;
            t=0:0.01:100*pi;
            x=a*sin(w*t);
            nfft=100;
            n=numel(t);
            y=na*rand(1,length(t));
            sine=x+y;
            for i=1:n
                plot(app.UIAxes,t(1:i),sine(1:i));
                drawnow;
            end
            
            nfft=1024;
            sine=fft(x,nfft);
            sine=sine(1:nfft/2);
            mx=abs(sine);
            fs=(0:nfft/2-1)*f/nfft;
            m=numel(fs);
            for j=1:m
                plot(app.UIAxes2,fs(1:j),mx(1:j));
                drawnow;
            end
            
        end
        
        % Value changed function: SinefrequencySlider
        function SinefrequencySliderValueChanged(app, event)
            value = app.SinefrequencySlider.Value;
            f=app.SinefrequencySlider.Value;
            a=app.SineAmplitudeSlider.Value;
            w=2*pi*f;
            na=app.NoiseAmplitudeSlider.Value;
            t=0:0.01:100*pi;
            x=a*sin(w*t);
            nfft=100;
            n=numel(t);
            y=na*rand(1,length(t));
            sine=x+y;
            for i=1:n
                plot(app.UIAxes,t(1:i),sine(1:i));
                drawnow;
            end
            
            nfft=1024;
            sine=fft(x,nfft);
            sine=sine(1:nfft/2);
            mx=abs(sine);
            fs=(0:nfft/2-1)*f/nfft;
            m=numel(fs);
            
            
            
        end
        
        % Value changed function: NoiseAmplitudeSlider
        function NoiseAmplitudeSliderValueChanged(app, event)
            value = app.NoiseAmplitudeSlider.Value;
            f=app.SinefrequencySlider.Value;
            a=app.SineAmplitudeSlider.Value;
            w=2*pi*f;
            na=app.NoiseAmplitudeSlider.Value;
            t=0:0.01:100*pi;
            x=a*sin(w*t);
            nfft=100;
            n=numel(t);
            y=na*rand(1,length(t));
            sine=x+y;
            for i=1:n
                plot(app.UIAxes,t(1:i),sine(1:i));
                drawnow;
            end
            
            nfft=1024;
            sine=fft(x,nfft);
            sine=sine(1:nfft/2);
            mx=abs(sine);
            fs=(0:nfft/2-1)*f/nfft;
            m=numel(fs);
            for j=1:m
                plot(app.UIAxes2,fs(1:j),mx(1:j));
                drawnow;
            end
            
        end
        
        % Value changed function: frequencydomainButton
        function frequencydomainButtonValueChanged(app, event)
            value = app.frequencydomainButton.Value;
            f=app.SinefrequencySlider.Value;
            a=app.SineAmplitudeSlider.Value;
            w=2*pi*f;
            na=app.NoiseAmplitudeSlider.Value;
            t=0:0.01:100*pi;
            x=a*sin(w*t);
            nfft=100;
            n=numel(t);
            y=na*rand(1,length(t));
            sine=x+y;
            
            nfft=1024;
            sine=fft(x,nfft);
            sine=sine(1:nfft/2);
            mx=abs(sine);
            fs=(0:nfft/2-1)*f/nfft;
            m=numel(fs);
            for j=1:m
                plot(app.UIAxes2,fs(1:j),mx(1:j));
                drawnow;
            end
        end
    end
    
    % Component initialization
    methods (Access = private)
        
        % Create UIFigure and components
        function createComponents(app)
            
            % Create UIFigure and hide until all components are created
            app.UIFigure = uifigure('Visible', 'off');
            app.UIFigure.Position = [100 100 790 489];
            app.UIFigure.Name = 'MATLAB App';
            
            % Create UIAxes
            app.UIAxes = uiaxes(app.UIFigure);
            title(app.UIAxes, 'TIME DOMAIN')
            xlabel(app.UIAxes, 'X')
            ylabel(app.UIAxes, 'Y')
            zlabel(app.UIAxes, 'Z')
            app.UIAxes.XLim = [0 10];
            app.UIAxes.YLim = [-10 10];
            app.UIAxes.XAxisLocation = 'origin';
            app.UIAxes.YAxisLocation = 'origin';
            app.UIAxes.Position = [297 260 475 208];
            
            % Create UIAxes2
            app.UIAxes2 = uiaxes(app.UIFigure);
            title(app.UIAxes2, 'Frequency Domain')
            xlabel(app.UIAxes2, 'X')
            ylabel(app.UIAxes2, 'Y')
            zlabel(app.UIAxes2, 'Z')
            app.UIAxes2.YLim = [0 100];
            app.UIAxes2.XAxisLocation = 'origin';
            app.UIAxes2.YAxisLocation = 'origin';
            app.UIAxes2.Position = [297 25 475 212];
            
            % Create SineAmplitudeSliderLabel
            app.SineAmplitudeSliderLabel = uilabel(app.UIFigure);
            app.SineAmplitudeSliderLabel.HorizontalAlignment = 'right';
            app.SineAmplitudeSliderLabel.Position = [1 429 86 22];
            app.SineAmplitudeSliderLabel.Text = 'Sine Amplitude';
            
            % Create SineAmplitudeSlider
            app.SineAmplitudeSlider = uislider(app.UIFigure);
            app.SineAmplitudeSlider.Limits = [0 10];
            app.SineAmplitudeSlider.ValueChangedFcn = createCallbackFcn(app, @SineAmplitudeSliderValueChanged, true);
            app.SineAmplitudeSlider.Position = [108 438 150 3];
            
            % Create SinefrequencySliderLabel
            app.SinefrequencySliderLabel = uilabel(app.UIFigure);
            app.SinefrequencySliderLabel.HorizontalAlignment = 'right';
            app.SinefrequencySliderLabel.Position = [1 352 86 22];
            app.SinefrequencySliderLabel.Text = 'Sine frequency';
            
            % Create SinefrequencySlider
            app.SinefrequencySlider = uislider(app.UIFigure);
            app.SinefrequencySlider.Limits = [0 10];
            app.SinefrequencySlider.ValueChangedFcn = createCallbackFcn(app, @SinefrequencySliderValueChanged, true);
            app.SinefrequencySlider.Position = [108 361 150 3];
            
            % Create NoiseAmplitudeSliderLabel
            app.NoiseAmplitudeSliderLabel = uilabel(app.UIFigure);
            app.NoiseAmplitudeSliderLabel.HorizontalAlignment = 'right';
            app.NoiseAmplitudeSliderLabel.Position = [1 289 126 22];
            app.NoiseAmplitudeSliderLabel.Text = 'Noise Amplitude Slider';
            
            % Create NoiseAmplitudeSlider
            app.NoiseAmplitudeSlider = uislider(app.UIFigure);
            app.NoiseAmplitudeSlider.Limits = [0 10];
            app.NoiseAmplitudeSlider.ValueChangedFcn = createCallbackFcn(app, @NoiseAmplitudeSliderValueChanged, true);
            app.NoiseAmplitudeSlider.Position = [148 298 150 3];
            
            % Create frequencydomainButton
            app.frequencydomainButton = uibutton(app.UIFigure, 'state');
            app.frequencydomainButton.ValueChangedFcn = createCallbackFcn(app, @frequencydomainButtonValueChanged, true);
            app.frequencydomainButton.Text = 'frequency domain';
            app.frequencydomainButton.Position = [22 136 111 22];
            
            % Show the figure after all components are created
            app.UIFigure.Visible = 'on';
        end
    end
    
    % App creation and deletion
    methods (Access = public)
        
        % Construct app
        function app = app_4
            
            % Create UIFigure and components
            createComponents(app)
            
            % Register the app with App Designer
            registerApp(app, app.UIFigure)
            
            if nargout == 0
                clear app
            end
        end
        
        % Code that executes before app deletion
        function delete(app)
            
            % Delete UIFigure when app is deleted
            delete(app.UIFigure)
        end
    end
end

Walter Roberson 2021-12-11

在 MATLAB Online 中打开

I predict that you need to turn the axes "hold" property on.

I also predict that you need to replace

            for j=1:m
                plot(app.UIAxes2,fs(1:j),mx(1:j));
                drawnow;
            end

with

            if ~exist('hsin', 'var') || ~isvalid(hsin)
                hsin = plot(app.UIAxes2, nan, nan);
            end
            for j=1:m
                hsin.XData = fs(1:j);
                hsin.YData = mx(1:j);
                pause(t(2));
            end

This will prevent you from continually generating new objects to draw into in your axes that has "hold" turned on.

The pause() is needed in order to get real-time. However, your data is sampled at 100 samples per second, and your graphics system might not be able to render at 100 frames per second, so it is not obvious what you want to do in this situation in order to maintain the real-time nature.

You would, generally speaking, want similar code structure in frequencydomainButton . However, you are plotting in the frequency domain, and it is not meaningful to talk about plotting in real-time in the frequency domain -- not unless you want to be doing spectrograms ??

Chunru 2021-12-11

在 MATLAB Online 中打开

classdef app_4 < matlab.apps.AppBase
%        app   instead of app_4?

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Error in plot(app.UIAxes)

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