MATLAB: What is this error “??? Index exceeds matrix dimensions.” mease in this code?

image processing

   Hi all
i tried to implement this code in matlab ,but i obtained this error"??? Index exceeds matrix dimensions."please help me in solving this error .
close all  
nr_classes = 40; 
nr_train = 4;
k = 1;
for i = 1:nr_classes 
for j = 1:nr_train 
if(i<10)
nume=
strcat('remove_smallobjects25\000',num2str(i),'hv',num2str(j),'.bmp'); 
else
nume = strcat('remove_smallobjects25\00',num2str(i),'hv',num2str(j),'.bmp');  
end
imag = double(imread(nume,'bmp'));
imag = imresize(imag,0.05); 
TrainingVectors(:,k) = imag(:);
k = k + 1;
end
end
 [features]=feature_extractoion_zoingmodification(TrainingVectors);
k = 1;
for i = 1:nr_classes 
for j = 1:nr_train 
      k=k+1;
  end
      mean_TrainingVectors(:,i) = mean(features(:,k-4:k-1),2);
  end
[KL, Dsorted, Vsorted] = Compute_PCA(features)
for dim = 1:length(eigen_values)
energy(dim) = (sum(eigen_values(1:dim)))/(sum(eigen_values(1:length(eigen_values))))*100;
end
nr_features = find(energy ==100);
nr_features = nr_features(1);
train_PCA = KL*mean_TrainingVectors;
train_PCA = train_PCA(1:nr_features,:);
clear TrainingVectors mean_TrainingVectors
k = 1;
for i = 1:nr_classes
for j = nr_train+1:nr_train+1
if(i<10)
nume = strcat('remove_smallobjects25\000',num2str(i),'hv',num2str(j),'.bmp');
else
nume = strcat('remove_smallobjects25\00',num2str(i),'hv',num2str(j),'.bmp');
end
imag = abs(double(imread(nume,'bmp')));
imag = imresize(imag,0.05);
TestVectors(:,k) = imag(:);
k = k + 1;
end
[features]=feature_extractoion_zoingmodification(TestVectors);
end
test_PCA = KL*TestVectors;
test_PCA = test_PCA(1:nr_features,:);
for i = 1:size(test_PCA,2)
for j = 1:size(train_PCA,2)
distance_measure(i,j) = sqrt(sum(abs(test_PCA(:,i)-train_PCA(:,j)).^2));
end
end
 [val, poz] = min(dist_City_block,[],2);
labels = [1:nr_classes]';
disp ('recognition score [%]')
score = length(find(poz==labels))/nr_classes * 100

Best Answer

In this line:
TrainingVectors(:,k) = imag(:);
you never declared TrainingVectors yet, so when you say ":" (meaning "all rows") it doesn't know how many "all" is because TrainingVectors has not been defined yet and doesn't have a set size. You need to preallocate it before either of the two for loops with the zeros() function.
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