Matlab tutorial course Exercises 1:

Exercises Go back to my webpage, download the file ‘startup.m’ and save it in your MATLAB home folder Must be directly in ‘Documents/MATLAB’ (not in the TutorialSlides you created earlier) In Matlab->Preferences->Current Folder, click view initial working folder preferences, set your In your Matlab home folder, create a folder ‘code’ Inside this, create two folders: ‘scripts’ and ‘functions’ Close Matlab, then reopen it You should see a welcome message this time (and every time you open Matlab from now on) You can edit ‘startup.m’ to change the welcome message if you like Type ‘path’ in the command window, your folder should have been added Copy ‘my_first_script’ and ‘my_fun’ into the suitable folders Check both script and functions work as before

Exercises Use Matlab to work out how many seconds there are in a year Hint, create variables, num_days, num_hours, etc first… How many seconds are there in 2 years? Or 31 years? Can you write this as a function to compute the number of seconds for any given number of years? Hint your function should have one input (the number of years) and one output – the answer Remember to use expressive function and variable names!

Exercises Lookup ‘Newton's law of universal gravitation’ (yes, you can use wikipedia) Use the command prompt to compute the force of attraction between the moon and the earth You can assume Earth’s mass: 5.97x1024 kg Moon’s mass: 7.35x1022 kg Distance from earth to moon: 380,000km Gravitational constant: 6.674×10−11 N m2 kg−2 Rewrite this as a function that takes as input, M1, M2 and r When you have tried both exercises, go back to my website, in the folder ‘code’ then ‘functions’ you can see my sample answers How did you do?