How to convert multiple images into row vector

I have converted using below code into column vector but i need to convert them into row vector

dirData = dir('C:\Users\Manjiri\Documents\MATLAB\*.tif'); 
fileNames = {dirData.name};
for k = 1:length(dirData) 
     filename = dirData(k).name;
     data1 = imread(filename);
     data_all{k}= data1(:);
end
save data_allEx data_all

Answer 1

[Andrei Bobrov]

...
data_all{k}= data1(:)';
...

Answer 2

[Jahnavi Mrudula Mudduluru]

I have a 1*784 matrix, I need to convert it to a 28*28 image, can anyone please tell me how to do it?I used reshage, imagesc for this, but the picture doesn't seem right, any suggestions would be a great help. I'm attaching a file which contains X_train which contains pixels of 12,000 images as row vectors, I'm supposed to study the 12,000th image, it is a 9, but I'm getting some weird shape.

Thank You

Answer 3

[Jahnavi Mrudula Mudduluru]

Sorry, I forgot to attach the file, I'm attaching it here.

[Azar Alizadeh]

load MNIST_train.mat;

X_tr=data(:,2:end);

Y=data(:,1);

"" X_img=reshape(X_tr,60000,28,28);""

you can either use the above line (60000 is the size of Mnist train set) which gives you a 60000x28x28 matrix.

or use a for loop and save each image separatelly , in this case :

for i=1:size(X_tr,1)

X_image{i}=reshape(X_tr,28,28)

end