MATLAB: Multiple graphs in one script

MATLABmultiple graphsplot

I am runny a loop over set of function and in the end I want some graphs of different data. there are three variables let say a, b and c.I have generated a graph using:

plot(iteration,a,iteration,b,iteration,c)
plot(a,b)

bt it is giving the 2nd one only. I want another graph of A on x axis and C on y axis likewise C on x axis and b on y axis. I cant figure out how to get multiple plots because it is generating plot of last command only. I tried

Best Answer

Do not use figure() as a variable name.

fig1 = figure(1);
ax1 = axes('Parent', fig1);
h = plot(ax1, Iteration, total_util*100, 'b', Iteration, DD, 'r', Iteration, PP, 'g');
legend(h, 'total_util','d_quantity','Price');
fig2 = figure(2);
ax2 = axes('Parent', fig2);
h = plot(ax2, total_util);

The simple version of that is

figure(1);
plot(Iteration, total_util*100, 'b', Iteration, DD, 'r', Iteration, PP, 'g');
legend('total_util','d_quantity','Price');
figure(2);
plot(total_util);

but I recommend using the longer version: with the shorter version, graphics can end up going places you do not want in some cases. See https://www.mathworks.com/matlabcentral/answers/?term=tag%3Aalways-parent

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MATLAB: Unknown axes in GUI

When calling plot or axes you can optionally specify a "parent" or "container", where the axes or plot object gets created in. The container is the handle object to the object where the new object will be created in. If you don't specify the container, it will be created in the "current figure" or "current axes". This can be literally anything you created or selected with your mouse before.

If you call plot and no current axes or figure exists, it will create the missing figure window, create an axes object inside it and then creates the plot into the axes.

See this example which creates some figures and uses a button in one window to plot something in another window (also attached):

function example_436887
% Create thee new figure windows
h_fig1 = figure;
h_fig2 = figure;
h_fig3 = figure;
% Create axes manually
h_ax2 = axes(h_fig2); % axes(container,...)
h_ax3 = axes(h_fig3);
% Plot something in h_ax2 which is in h_fig2
plot(h_ax2,1:10,rand(1,10))
% Modify Size of h_fig1 and disable menu bar and toolbar
h_fig1.Position(3) = 350;
h_fig1.Position(4) = 100;
set(h_fig1,'MenuBar','none',...
    'ToolBar','none');
% Create a Button in h_fig1
button_plot  = uicontrol(h_fig1, ... % use h_fig1 as parent container
    'Style','pushbutton',...
    'String','Call Plot in Figure specified as h_fig3', ...
    'Position',[20,20,300,25],...
    'Callback',@button_plot_Callback);
function button_plot_Callback(source,eventdata) 
% Plot something in h_ax3:


    plot(h_ax3,1:10,rand(1,10)); % plot into parent container h_ax3

end % function button_plot_Callback


end % function example_436887

When pushing the button to plot inside h_fig1, the target container needs to be specified. If you change the Callback-Function from this:

function button_plot_Callback(source,eventdata) 
% Plot something in h_ax3:
    plot(h_ax3,1:10,rand(1,10)); % plot into parent container h_ax3
end % function button_plot_Callback

to this:

function button_plot_Callback(source,eventdata) 
% Plot something in h_ax3:
    plot(1:10,rand(1,10)); % plot into current axes/figure
end % function button_plot_Callback

The error you described occurs, as the plot command creates an axes in the current figure (which is the figure with the button) because there is no axes to plot into.

MATLAB: How to overlay two plots upon the same axes

Use the hold function:

a = [1, 2, 3]
b = [1, 3, 2]
compPlot = figure('Name', 'Comparison of stuff');
ax1 = axes('Parent', compPlot);
plot(ax1, a, 'Color', 'blue');
hold on
plot(ax1, b, 'Color', 'red');
hold off
title(ax1, 'Figure 3: Plot of stuff');

Best Answer

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MATLAB: Unknown axes in GUI

MATLAB: How to overlay two plots upon the same axes

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