How can i change multiple 2d images into corresponding 1d vectors?

Hi,i am currently working on a project concerning,but i am pretty much a newbie at Matlab programming. Coming to the problem at hand,let me show you what I have done till now:

clear all; clc; for i=1:10 filename=dir('C:\MATLAB\Image Database\*.pgm'); end

imagename1=cell(length(filename),1);

for i=1:10

imagename1{i}=imresize(imread(strcat('C:\MATLAB\Image Database\',filename(i).name)),[50 50]);

end

I have attempted to read multiple images from a folder called Image Database.Having done that, I stored each of these images after resizing them, into a cell structure. I would like to convert each 50X50 uint8 image occupying a cell,into a 1D image vector.I am stuck here and would really appreciate some help. P.S. The 1D image vectors would then be stored in one structure. Thanks!