New to matlab, trying to understand basic functions still

Hello! I am new to matlab and I am working with some data, however, I am trying to understand what it means with the following (hopefully this makes sense):

x= D0a(:,1); nf=length(x);
y=(1:9)'; ns= length(y);

D0a is the element.

Answer 1

[Sulaymon Eshkabilov]

The meaning of these entries are:

x= D0a(:,1);   % The existing variable D0a's column 1 is assigned to a new variable called x 
nf=length(x);  % Counting the length of x (vector) 
y=(1:9)';      % Creating y vector, transposing 1 to 9 (row vector) into 1:9 column vector    
ns= length(y); % Counting the length of y (vector)
% to get help on any of MATLAB functions use: help
help length
help transpose
% Advice: study MATLAB Onramp

Answer 2

[the cyclist]

Assuming that D0a is a matrix, then

• x is the 1st column of that matrix. (x is a column vector.)
• nf is the number of elements in that vector x.
• y is the vector [1 2 3 4 5 6 7 8 9], but then transposed to be a column vector, rather than a row vector.
• ns is the number of elements in that vector y.

You are right that these are very basic questions. I strongly suggest you invest a couple hours in viewing the free MATLAB Onramp online tutorial.

Answer 3

[John D'Errico]

If you are this new to MATLAB, then you seriously need to spend some tie reading the tutorials available.

The MATLAB Onramp is a good place to start. But there are also many other things you can read. Why not read the manual? Yes, I know, you don't need no steenkin' mauals. Spend a couple of hours. It will pay dividends.