How to use images in drop down menu

Question

Noor Solangi 2019-9-10

0
链接

此问题的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/479765-how-to-use-images-in-drop-down-menu

回答： Bhargavi Maganuru 2019-9-13

I'm using a drop down menu which includes 5 different options for different calculations, My objective is whenever I touch option 1, specific image should appear. this goes for the rest of the options as well. I'm using this code, but there seems to be some problem with it. My first option is called "Inverting"

It shows error Matrix dimensions must agree.

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value = app.drop.Value;

global image1

if value == 'Inverting'

[filename, pathname] =uigetfile({'*.jpg'},'File Selector');

fullpathname=strcat(pathname,filename);

image1= imread(fullpathname);

imshow(image1,'Parent',app.UIAxes);

end

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Answer 1

Bhargavi Maganuru 2019-9-13

0
链接

此回答的直接链接

https://ww2.mathworks.cn/matlabcentral/answers/479765-how-to-use-images-in-drop-down-menu#answer_391671

在 MATLAB Online 中打开

Matrix dimensional error is because, value and options are compared using ‘==’ operator, it gives error when the length of the value differs from option length. Use strcmp instead of ‘==’ operator, which compare strings of different length.

The line

value = app.drop.Value;

in your code also gives error as there is no method or property named drop, use DropDown instead.

You can use following code to display image after your select first option “Inverting” from DropDown menu.

function DropDownValueChanged(app, event) 
            value = app.DropDown.Value; 
            global a 
            if strcmp(value,'Inverting') 
                [filename, pathname] =uigetfile({'*.jpg'},'File Selector'); 
                fullpathname=strcat(pathname,filename); 
                a=imread(fullpathname);                 
                imshow(a,'parent',app.UIAxes); 
            end 
        end 