Callback Function for update plot with multiple functions

Question

Maxsam Donta 2017-9-23

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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358067-callback-function-for-update-plot-with-multiple-functions

编辑： Jan 2017-9-24

Hi, I need the slider bar to adjust all three of the functions on the plot, but I don't know how to make a callback to update it. Plot picture is attached and c

ode is here:

% 3.131
k = 180; %W/m K
L = 10e-3; %m
t = 1e-3; %m
Tb = 100 + 273; %K
Tinf = 25 + 273; %K
h = linspace(10,1000,20);
m = sqrt(2 .* h ./ (k * t));
M = sqrt(2 .* h .* t .* k) .* (Tb-Tinf);
qfa = M .* (sinh(m .* L)+(h ./ (m .* k)) .* cosh(m .* L)) ./ (cosh(m .*L) + (h ./ (m .*k)).*sinh(m.*L));
qfb = M .* tanh(m.*L);
qfd = M;
f = figure;
plot(h,qfa,'k','DisplayName','qfa'); hold on;
plot(h,qfb,'b','DisplayName','qfb');
plot(h,qfd,'r','DisplayName','qfd');
xlabel('Convection coefficient, h(W/m^2 * K)'); ylabel('Heat rate,qf(W/m)'); title('Heat rate vs h for different boundary conditions');
legend('show')
b = uicontrol('Parent',f,'Style','slider','Position',[81,54,419,50],...
    'value',k,'min',15,'max',180);
bgcolor = f.Color;
bl1 = uicontrol('Parent',f,'Style','text','Position',[50,54,23,50],...
    'String','15','BackgroundColor',bgcolor);
bl2 = uicontrol('Parent',f,'Style','text','Position',[500,54,23,50],...
    'String','180','BackgroundColor',bgcolor);
bl3 = uicontrol('Parent',f,'Style','text','Position',[240,50,100,40],...
    'String','Conduction Coefficient, k(W/m K)','backgroundColor',bgcolor);

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Walter Roberson 2017-9-23

You have not defined what the slider should do .

Maxsam Donta 2017-9-24

编辑：Maxsam Donta 2017-9-24

The slider should change the value of k and should adjust the plot accordingly

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Answer 1

Rik 2017-9-24

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https://ww2.mathworks.cn/matlabcentral/answers/358067-callback-function-for-update-plot-with-multiple-functions#answer_282902

If that k should contain the value of the slider, make sure the slider exist before the first plot and the use k=get(b,'Value').

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Maxsam Donta 2017-9-24

Thank you for your response. There are no longer errors when I do this, but the graph doesn't change when I move the slider.

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Answer 2

Jan 2017-9-24

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/358067-callback-function-for-update-plot-with-multiple-functions#answer_282910

编辑：Jan 2017-9-24

在 MATLAB Online 中打开

See https://www.mathworks.com/matlabcentral/answers/292993-continuous-slider-callback-not-updated-handles-in-callback-function and https://www.mathworks.com/matlabcentral/answers/264979-continuous-slider-callback-how-to-get-value-from-addlistener for defining a callback, which is triggered during moving the slider, not only when releasing it.

[EDITED] Try this:

function YourGUI
k = 180; %W/m K
FigH = figure;
handles.gfaPlot = plot(h,qfa,'k','DisplayName','qfa');
hold on;
handles.gfbPlot = plot(h,qfb,'b','DisplayName','qfb');
handles.gfdPlot = plot(h,qfd,'r','DisplayName','qfd');
xlabel('Convection coefficient, h(W/m^2 * K)');
ylabel('Heat rate,qf(W/m)');
title('Heat rate vs h for different boundary conditions');
legend('show')
handles.Slider = uicontrol('Parent',f,'Style','slider', ...
          'Position',[81,54,419,50],...
          'value',k,'min',15,'max',180, ...
          'Callback', {@yourSliderCallback, handles});
bgcolor = f.Color;
uicontrol('Parent',f,'Style','text','Position',[50,54,23,50],...
  'String','15','BackgroundColor',bgcolor);
uicontrol('Parent',f,'Style','text','Position',[500,54,23,50],...
  'String','180','BackgroundColor',bgcolor);
uicontrol('Parent',f,'Style','text','Position',[240,50,100,40],...
  'String','Conduction Coefficient, k(W/m K)', ...
          'backgroundColor',bgcolor);
end
function [h, gfa, gfb, gfd] = YourCalculation(k)
L = 10e-3; %m
t = 1e-3; %m
Tb = 100 + 273; %K
Tinf = 25 + 273; %K
h = linspace(10,1000,20);
m = sqrt(2 .* h ./ (k * t));
M = sqrt(2 .* h .* t .* k) .* (Tb-Tinf);
qfa = M .* (sinh(m .* L)+(h ./ (m .* k)) .* cosh(m .* L)) ./ ...
           (cosh(m .*L) + (h ./ (m .*k)).*sinh(m.*L));
qfb = M .* tanh(m.*L);
qfd = M;
end
function yourSliderCallback(SliderH, EventData, handles)
k = get(SliderH, 'Value');
[h, gfa, gfb, gfd] = YourCalculation(k);
set(handles.gfaPlot, 'YData', gfa);
set(handles.gfbPlot, 'YData', gfb);
set(handles.gfdPlot, 'YData', gfd);
end

Now the callback of the slider calculates the new values and updates the Y-positions of the lines. The callback is triggered, when the mouse is released. Using the "continuous slider callback" as explained at first in my message would change the value wile the slider is moved already.

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Maxsam Donta 2017-9-24

Thank you for your response. I am very new to Matlab and programming in general, so I unfortunately I'm lost with these references as for what they mean and what to do.

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Callback Function for update plot with multiple functions

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