what is the meaning of the code?

last16 = 42*ones(16,1);

[per isakson]

Did you try read the help? See ones, Create array of all ones

Answer 1

[Image Analyst]

It first uses the ones() function to make a 16-by-1 column vector of 1's. Then since it multiplies that by 42, it ends up with a column vector where every element has the value of 42. Any time you see a function that you don't know what it does, look it up in the help.