Problem with using while

Hi Guys

have a problem with using while and give me an error when i run matlab for the code attached named Evaluationthedetector

Kindly looking for your assistance

Regards

load('gTruth.mat')
smokedetection = selectLabels(gTruth,'cat');
if ~isfolder(fullfile('EvaluationData'))
    
    mkdir EvaluationData
    addpath('EvaluationData');
    
    evaluationData = objectDetectorTrainingData(gTruth,...
    'SamplingFactor',10,'WriteLocation','EvaluationData');
end
imds = imageDatastore(fullfile('EvaluationData'));
numImages = height(evaluationData);
result(numImages,:) = struct('Boxes',[],'Scores',[]);
while i = 1:numImages
    
    % Read Image
    I = readimage(imds,numImages); 
    
    % Detect the object of interest
    [bboxes, scores] = detect(detector,I,'MiniBatchSize', 32);
    T = 0.54; % Define threshold here
    idx = scores >= T;
    
    % if there are 2 or more objects detected, show them
    if nnz(idx) >= 2
        % Retrieve those scores that surpassed the threshold
        s = scores(idx);

        % Do the same for the labels as well

        bboxes = bboxes(idx, :); % This logic doesn't change
    % Store result 
    result(i).Boxes = bboxes;
    result(i).Scores = scores;
    end
end
% Convert structure to table
results = struct2table(result);



Error: File: Evaluationthedetector.m Line: 14 Column: 9
Incorrect use of '=' operator. To assign a value to a variable, use '='. To compare values for equality, use
'=='.

Answer 1

[James Heselden]

You are using a while loop where you should be using a for loop.

% Swap out 
while i = 1:numImages
    ...
end

% to 
for i = 1:numImages
    ...
end

Regards

James

Answer 2

[Sulaymon Eshkabilov]

while .. end is not used correcly, use for ... end instead

for i = 1:numImages
    
    % Read Image
    I = readimage(imds,numImages); 
    
    % Detect the object of interest
    [bboxes, scores] = detect(detector,I,'MiniBatchSize', 32);
    T = 0.54; % Define threshold here
    idx = scores >= T;
    
    % if there are 2 or more objects detected, show them
    if nnz(idx) >= 2
        % Retrieve those scores that surpassed the threshold
        s = scores(idx);
        % Do the same for the labels as well
        bboxes = bboxes(idx, :); % This logic doesn't change
    % Store result 
    result(i).Boxes = bboxes;
    result(i).Scores = scores;
    end
end
% Convert structure to table