Initialize GUI plot area

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Zhenjia
Zhenjia 2015-4-28
评论： Image Analyst 2015-4-29
Hi, I created a GUI with a "Run" button and a "Plot" area using GUIDE. I want the plot area to be blank when the GUI is open. After clicking "Run", the curves show in the plot area. However, there is always an existing plot in the plot area when I open GUI. If I don't click "Run" button, there are no variables to plot curves. I am confused how GUI save my previous plot there, and how I can clear them. Thanks.(Matlab R2015a)
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Joseph Cheng
Joseph Cheng 2015-4-28
stupid question here but are you sure that you closed the GUI before you execute the GUI again? That is the only way i can think of data still remaining to be plotted.
Zhenjia
Zhenjia 2015-4-28
Yes, I am pretty sure I close it. I totally operate from the beginning. Open Matlab, type in guide, then click run. The curves are in the plot area before I click the "Run" button on my GUI.

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回答（1 个）

Image Analyst
Image Analyst 2015-4-28
Before you plot the stuff you want to plot and see, issue this command:
cla reset;
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Joseph Cheng
Joseph Cheng 2015-4-28
编辑：Joseph Cheng 2015-4-28
if that is the case you would put what Image Analyst suggested in the
(yourGUIname)__OpeningFcn(hObject, eventdata, handles, varargin)
portion. This is where you can initialize items before the figure is made visible.
I would go through using the debug mode and step through and see where the plotting occurs to understand where it is coming from. Is there code left over from a createfcn that wasn't deleted.
Image Analyst
Image Analyst 2015-4-29
They're not just going to show up on their own after you've just created the axes or just cleared them. You have code to make them do the plot. Find every place where you call plot() and set a breakpoint there. Find out where you're doing the plotting that you don't want to do and delete those lines or prevent it somehow (like put into an "if" block or something).

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