Not understand function/command

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Hello everyone i am a new learner of matlab and trying to read and understand code line by line. For that i use matlab help to understand the command. But in many cases, when i enter any command in matlab help it shows not found. I am attaching a code here below. In the last line there is a command 'frames' which i didn't understand and could not find in matlab help as well. Please help me..

Frames = zeros(540, 960, 40);
c = 0;
%for t=470:519
for t=1:100
      c = c + 1;
%   name=sprintf('lightswicth/%d.bmp', t);
%   name = strcat('foregroundaperture/b00',num2str(t),'.bmp');
      name = strcat('vid/Image',num2str(t),'.jpg');
  display(name)
  img=imread(name);
  imggray=rgb2gray(img);
  Frames(:, :, c)=imggray;
 end

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Torsten 2018-10-22

A three-dimensional matrix named "Frames" of dimension 540x960x40 is created in the very first line of the code. So this is no command, but a data structure created by the person who wrote the code.