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## How to update plot data manually?

James Thompson

### James Thompson (view profile)

さんによって質問されました 2019 年 5 月 22 日

さんによって 編集されました 2019 年 5 月 30 日 12:51
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.

#### 0 件のコメント

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## 1 件の回答

2019 年 5 月 22 日

2019 年 5 月 30 日 12:51

What about giving refreshdata() a shot? Here's how it would work with your description.
% 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 件のコメント

2019 年 5 月 22 日
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

### James Thompson (view profile)

2019 年 5 月 22 日
So in this GUI I have a "page" data structure which fills the plots with data and you can switch through multiple pages. So when switching pages I want to save the current zoom for that page. Setting to auto will work but it loses the capability to keep track of what the current zoom was for a given page.
What is the difference between drawnow and refreshdata?