How can I write the following matrix?
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Michelle Ashwini
on 13 Mar 2014
Commented: Michelle Ashwini
on 14 Mar 2014
if true
A = [x(1)^2 x(1)*y(1) y(1)^2 x(1) 1;
x(2)^2 x(2)*y(2) y(2)^2 x(2) 1;
x(3)^2 x(3)*y(3) y(3)^2 x(3) 1;
x(4)^2 x(4)*y(4) y(4)^2 x(4) 1;
x(5)^2 x(5)*y(5) y(5)^2 x(5) 1;
x(6)^2 x(6)*y(6) y(6)^2 x(6) 1;
x(7)^2 x(7)*y(7) y(7)^2 x(7) 1;
x(8)^2 x(8)*y(8) y(8)^2 x(8) 1;
x(9)^2 x(9)*y(9) y(9)^2 x(9) 1;
x(10)^2 x(10)*y(10) y(10)^2 x(10) 1 ]
end
The integers 1-10 are meant to be subscripts. I've tried using the syms and repmat functions but have not gotten anywhere further.
Accepted Answer
Marta Salas
on 13 Mar 2014
x = sym('x', [10 1]);
y = sym('y', [10 1]);
if true
A = [x(1)^2 x(1)*y(1) y(1)^2 x(1) 1;
x(2)^2 x(2)*y(2) y(2)^2 x(2) 1;
x(3)^2 x(3)*y(3) y(3)^2 x(3) 1;
x(4)^2 x(4)*y(4) y(4)^2 x(4) 1;
x(5)^2 x(5)*y(5) y(5)^2 x(5) 1;
x(6)^2 x(6)*y(6) y(6)^2 x(6) 1;
x(7)^2 x(7)*y(7) y(7)^2 x(7) 1;
x(8)^2 x(8)*y(8) y(8)^2 x(8) 1;
x(9)^2 x(9)*y(9) y(9)^2 x(9) 1;
x(10)^2 x(10)*y(10) y(10)^2 x(10) 1 ]
end
11 Comments
Marta Salas
on 14 Mar 2014
Edited: Marta Salas
on 14 Mar 2014
Type "ver" on the command line. MATLAB lists all the installed toolboxes. Look for Symbolic Math Toolbox. If you don't have the toolbox, you can not use the symbolic functions.
More Answers (1)
Azzi Abdelmalek
on 13 Mar 2014
Edited: Azzi Abdelmalek
on 13 Mar 2014
out=[x.^2 x.*y y.^2.*x ones(10,1)]
% x and y are column vextors
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