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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

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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 comentario
Jan
Jan el 13 de En. de 2023
Editada: Jan el 13 de En. de 2023
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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Respuestas (1)

Kevin Holly
Kevin Holly el 13 de En. de 2023
Based on the red squiggly line under Methods in your screenshot, you may have an extra "end" in your code.
  2 comentarios
Kevin Holly
Kevin Holly el 13 de En. de 2023
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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