Can anyone please explain that what each command is showing in the following program? How to select the dimesions? As well as recommend something to study the loops.

Question

Heya :) 2020-2-28

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评论： Heya :) 2020-2-29

X=x(2:21); (what is the meaning of x(2:21))?
Y=y(2:21);
M=zeros([20,10]);
for i=1:20
    for j=1:10
        if j==1
           M(i,j)=1;
        elseif j==2
           M(i,j)=x(i);
        elseif j==3
           M(i,j)=y(i);
        elseif j==4
           M(i,j)=x(i)^2;
        elseif j==5
           M(i,j)=y(i)^2;
        elseif j==6
           M(i,j)=x(i)*y(i);
           elseif j==7
            M(i,j)=x(i)^2*y(i);
        elseif j==8
            M(i,j)=y(i)^2*x(i);
        elseif j==9
            M(i,j)=x(i)^3;
        else 
            M(i,j)=y(i)^3;  
 
        end    
    end
end
X=X';

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darova 2020-2-28

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X=x(2:21); (what is the meaning of x(2:21))?

Why don't just try?

x = 1:24           % create some data
x =
  Columns 1 through 9
     1     2     3     4     5     6     7     8     9
  Columns 10 through 18
    10    11    12    13    14    15    16    17    18
  Columns 19 through 24
    19    20    21    22    23    24
X = x(2:21)        % choose elements from 2 to 21
X =
  Columns 1 through 9
     2     3     4     5     6     7     8     9    10
  Columns 10 through 18
    11    12    13    14    15    16    17    18    19
  Columns 19 through 20
    20    21

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Answer 1

Guillaume 2020-2-28

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I recommend that you go through the free Matlab Onramp tutorial to learn the basics of matlab. The code you show is very basic (if very poorly written) and if you struggle to understand it, you will really struggle with matlab.