How can I write the following matrix?

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Michelle Ashwini
Michelle Ashwini 2014-3-13
评论： Michelle Ashwini 2014-3-14
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.

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采纳的回答

Marta Salas
Marta Salas 2014-3-13
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
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Marta Salas
Marta Salas 2014-3-14
编辑：Marta Salas 2014-3-14
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.
Michelle Ashwini
Michelle Ashwini 2014-3-14
Right. It does not have the symbolic math toolbox installed. Is there another way to to the same thing?

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更多回答（1 个）

Azzi Abdelmalek
Azzi Abdelmalek 2014-3-13
编辑：Azzi Abdelmalek 2014-3-13
out=[x.^2 x.*y y.^2.*x ones(10,1)]
% x and y are column vextors

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