New to matlab, trying to understand basic functions still

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Kayla
Kayla 2023-11-2
回答： John D'Errico 2023-11-2
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.

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采纳的回答

Sulaymon Eshkabilov
编辑：Sulaymon Eshkabilov 2023-11-2
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

更多回答（2 个）

the cyclist
the cyclist 2023-11-2
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.
John D'Errico
John D'Errico 2023-11-2
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.

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