how to create models in MATLAB?

sir, i am a student and wants to ask that how can in design a code in MATLAB to derive the atmospheric particulate backscattering and extinction coefficient

[Stephen23]

"i am a student and wants to ask that how can in design a code in MATLAB"

In a nutshell:

• Study the field related to that topic, do your assignments, work hard.
• Learn how to use MATLAB, start with the Introductory Tutorials.
• Practice creating algorithms to solve problems (read Pólya's excellent book How to Solve It).
• Learn good code practices (they make your life easier):

https://www.mathworks.com/matlabcentral/answers/228557-experts-of-matlab-how-did-you-learn-any-advice-for-beginner-intermediate-users