so in appdesigner im building a list box to turn the image to (red ,blue ,green) this is my code for it bout it wont run

3 次查看（过去 30 天）
jana
jana 2023-1-13
编辑： Jan 2023-1-13
value = app.ListBox.Value;
if value== 'Red'
a=(app.Image);
red=a;
red(:,:,2:3)=0
setappdata(0,'filename',red);
setappdata(0,'imrotation',red);
I=imshow(red,'parent',app.UIAxes2,...
'XData',[1 app.UIAxes2.Position(3)],...
'YData',[1 app.UIAxes2.Position(4)]);
app.UIAxes2.XLim=[0 I.XData(2)];
app.UIAxes2.YLim=[0 I.YData(2)];
else if value== 'Blue'
Agray=im2gray(app.Image);
zerochan = zeros(size(Agray),class(Agray));
blue = cat(3,zerochan,zerochan,Agray);
setappdata(0,'filename', blue);
setappdata(0,'imrotation', blue);
I=imshow(blue,'parent',app.UIAxes2,...
'XData',[1 app.UIAxes2.Position(3)],...
'YData',[1 app.UIAxes2.Position(4)]);
app.UIAxes2.XLim=[0 I.XData(2)];
app.UIAxes2.YLim=[0 I.YData(2)];
else
Agray=im2gray(app.Image);
zerochan = zeros(size(Agray),class(Agray));
green = cat(3,zerochan,Agray,zerochan);
setappdata(0,'filename',green);
setappdata(0,'imrotation',green);
I=imshow(green,'parent',app.UIAxes2,...
'XData',[1 app.UIAxes2.Position(3)],...
'YData',[1 app.UIAxes2.Position(4)]);
app.UIAxes2.XLim=[0 I.XData(2)];
app.UIAxes2.YLim=[0 I.YData(2)];
end
end
end
  1 个评论
Jan
Jan 2023-1-13
编辑：Jan 2023-1-13
Please do not post code as screenshots, but as text. Then it can be used to create an answer with copy&paste.
This is not twitter: No # before the tags. Thanks.

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回答（1 个）

Kevin Holly
Kevin Holly 2023-1-13
Based on the red squiggly line under Methods in your screenshot, you may have an extra "end" in your code.
  2 个评论
Kevin Holly
Kevin Holly 2023-1-13
Ran in:
Use strings instead of character arrays for your if conditions
if value == "Red"
The size was causing issues. See difference of size between character and string arrays below.
Character array:
size('Red')
ans = 1×2
1 3
String array:
size("Red")
ans = 1×2
1 1

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