Unrecognized function or variable 'classify' in APP DESIGNER

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%This is how I load my .mat file
app.Lettuce_Net = load ('Lettuce_Net.mat');
app.Lettuce_Net = app.Lettuce_Net.Lettuce_Net;
handles.Lettuce_Net = app.Lettuce_Net;
handles.output = hObject;
% Update handles structure
guidata(hObject, handles);
%This is how I classify the uploaded Image
function classify_1_Callback(app, event)
% Create GUIDE-style callback args - Added by Migration Tool
[hObject, eventdata, handles] = convertToGUIDECallbackArguments(app, event); %#ok<ASGLU>
% hObject handle to classify_1 (see GCBO)
% eventdata reserved - to be defined in a future version of MATLAB
% handles structure with handles and user data (see GUIDATA)
app.Lettuce_Net = handles.Lettuce_Net;
handles = guidata(hObject);
b = handles.b;
b = imresize(b, [227, 227], 'nearest');
[YPred,scores] = classify(app.Lettuce_Net, b);
scores = max(double(scores*100));
set(handles.result,'string',join([string(YPred),'' ,scores ,'%']));
end

Accepted Answer

Image Analyst
Image Analyst on 25 May 2022
It seems you do not have the Deep Learning Toolbox or Statistics and Machine Learning Toolbox. What does this say:
>> ver
(erase your license number before posting your toolboxes). What do you see if you do this:
>> which -all classify
C:\Program Files\MATLAB\R2022a\toolbox\stats\stats\classify.m
C:\Program Files\MATLAB\R2022a\toolbox\nnet\cnn\@DAGNetwork\classify.m % DAGNetwork method
C:\Program Files\MATLAB\R2022a\toolbox\matlab\depfun\+matlab\+depfun\+internal\FileClassifier.m % matlab.depfun.internal.FileClassifier method
  9 Comments
Image Analyst
Image Analyst on 15 Jun 2022
@Fatin Nasuha Bt Asrol what is the exact error message. Tell us all the red text you see in the command window, including the lines of code, and line numbers, and the error message itself.

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