what happened to the folowing code?

Question

romasha 2014-1-26

0
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此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/113790-what-happened-to-the-folowing-code

评论： romasha 2014-1-27

Code

% Choose default command line output for test2
handles.output = hObject;
% create an axes that spans the whole gui
ah = axes('unit', 'normalized', 'position', [0 0 1 1]);
% import the background image and show it on the axes
bg = imread('C:\Users\Romesha\Desktop\eye.jpg'); imagesc(bg);
% prevent plotting over the background and turn the axis off
 set(ah,'handlevisibility','off','visible','off')
set(bg,'alphadata',.1);
% making sure the background is behind all the other uicontrols uistack(ah, 'bottom');
% Update handles structure
guidata(hObject, handles);
 *Error*
>> test2
Error using set
Invalid handle
Error in test2>test2_OpeningFcn (line 63)
set(bg,'alphadata',.1);
Error in gui_mainfcn (line 221)
    feval(gui_State.gui_OpeningFcn, gui_hFigure, [], guidata(gui_hFigure),
    varargin{:});
Error in test2 (line 42)
    gui_mainfcn(gui_State, varargin{:});

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Answer 1

Walter Roberson 2014-1-26

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此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/113790-what-happened-to-the-folowing-code#answer_122259

Nothing happened to it. bg is the result of imread(), which does not plot. The result of imread() is the data matrix of the image, which is not a handle. What you want to set() against is not bg but rather the result of the imagesc(bg)