Writing a user-defined function.

Can some one please help me with this. I don't know where to start. Write a user-defined function named topBottomDifference that takes a single input, a matrix, and returns a vector of the difference between the first row of the matrix and the last row of the matrix.

[David Fletcher]

The best place to start might be to invest a few hours in Matlab Onramp. It will cover everything you need to know to complete your task.

https://uk.mathworks.com/learn/tutorials/matlab-onramp.html

Answer 1

[DGM]

Well,

row1=mymatrix(1,:); 

is the first row of a matrix, and

row2=mymatrix(end,:);

is the last row.

And you can write a function like so:

https://www.mathworks.com/help/matlab/ref/function.html

There's also more info in the Topic section at the end of that page.