How can I explain below matlab code to someone each line?

handles.output=hObject;
[a b]=uigetfile({'*.*'});
img=imread({b a})
gravy=rgb2gray(img);
gr=graythresh(grayy);
handles.bw=im2bw(grayy,gr);
imshow(img,'parent',handles.axes1);
guidata(hObject,handles);

[Saktheeswaran Mohan]

If anyone know please explain me

[Rik]

That depends on whom you would like to explain this code and their proficiency in Matlab.

I would suggest starting with the documentation of each function.

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[Saktheeswaran Mohan]

I have viva for my project. My supervisor asked me explain that code one by one line for how it will be work for car parking slot identification that time I am struggle to explain because I m the beginner for Matlab . Then I got fail mark as well. I feel very sad. How can I do that please help me

[Walter Roberson]

I could probably write at least two textbooks to explain the meaning of that code line by line. Maybe more, as you cannot really understand the lines without studying the nature of reality, so you pretty much have to refer to "Plato's Cave", and to Peano's studies on the meaning of arithmetic and Proof, and to Goëdel's Incompleteness Theorem, and Turing's Finite Automata and The Halting Problem... and of course the problem of Quantum Mechanics and The Many Worlds Hypothesis.

Because of this, I refuse to even start explaining anything line by line. If someone wants something explained, they can ask specific questions.