How to update plot data manually?
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Is there a way to manipulate plot data without showing the updated plot information and then manually update the information all at once?
What I would like to do:
I have four plots and for each plot I manipulate the data and axes. The updates can be seen in the order they are perfromed. I would like to update the each individual axes and "draw" the updates all at once.
Clarification: I am working within a GUI designed in GUIDE. All plots are on the same figure.
回答（1 个）
% Create your 4 axes and their initial lines
x = -pi :.1: pi;
fh = figure();
subplot(2,2,1)
h1 = plot(x,sin(x));
subplot(2,2,2)
h2 = plot(x,2*sin(x));
subplot(2,2,3)
h3 = plot(x,cos(x));
subplot(2,2,4)
h4 = plot(x,2*cos(x));
% Setup data source
% Set up which variables will be used to define
% the (x,y) coordinates for each line object
set(h1, 'XDataSource', 'x', 'YDataSource', 'y1')
set(h2, 'XDataSource', 'x', 'YDataSource', 'y2')
set(h3, 'XDataSource', 'x', 'YDataSource', 'y3')
set(h4, 'XDataSource', 'x', 'YDataSource', 'y4')
% Change the plot data (axes won't update yet)
x = pi : 0.1 : 2*pi;
y1 = sin(x);
y2 = 2*sin(x);
y3 = cos(x);
y4 = 2*cos(x);
% Update all axes
refreshdata(fh, 'caller')
In my example I supplied the figure handle in refreshdata() but you can supply a vector of line objects ([h1,h2,h3,h4]) or axis handles.
Alternatively, you could use drawnow() at the end of the updating loop where you update the XData and YData properties.
7 个评论
James Thompson
2019-5-22
James Thompson
2019-5-22
"Unfortunatley I'm working within a GUI so I don't have access to the matlab workspace"
Any change you make will have to be done to the GUI code itself. The solution I proposed would be implemented within the GUI code in the same way as if it were implemented outside of a GUI. You'd just need to specify the the caller workspace (I updated my answer to reflect that).
"So these plots don't update because you use the XDataSource property rather than manipulating XData directly?"
The advantage of using refreshdata() rather than updating the XData and YData is that all of your plots will be updated simultaneously. The X/YData would have to be updated for each plot one at a time.
James Thompson
2019-5-22
Do you need to update the axis limits on each iteration? Would it work if they were on 'auto'?
xlim auto
ylim auto
Unfortunately imagesc() handle doesn't have the X/YDataSource property (but it will have X/Ydata).
I appended my answer again to suggest the use of drawnow() after updating x/ydata.
James Thompson
2019-5-22
The descriptions in the links to the documentation I provided will answer that. drawnow() merely updates all plots if they haven't been updated already. This is sometimes necessary when creating a plot within a loop where you want the axes to update every iteration rather than at the end of the loop.
The refreshdata() command just updates the line objects that were setup using the X/YDatdaSource properties.
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2019-5-22
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