place matrix in array part 2

2016 10 15
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更新时间：2016 10 15
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Hello, I have these points:
x1 = (1,0), x2 = (0.5,1), x3 = (0.5,1.5), x4 = (0, -1), x5 = (-1,1), x6 = (0.5, -1)
y1 = y2 = y3 = 1 and y4 = y5 = y6 = -1.
How do I go about generating a 6 x 6 matrix with entries
y1y1x1'x1 y1y2x1'x2 y1y3x1'x3 y1y4x1'x4 y1y5x1'x5 y1y6x1'x6
y2y1x1'x1 y2y2x2'x2 y2y3x2'x3 y2y4x2'x4 y2y5x2'x5 y2y6x2'x6
y3y1x3'x1 y3y2x3'x2 y3y3x3'x3 y3y4x3'x4 y3y5x3'x5 y3y6x3'x6
y4y1x4'x1 y4y2x4'x2 y4y3x4'x3 y4y4x4'x4 y4y5x4'x5 y4y6x4'x6
y5y1x5'x1 y5y2x5'x2 y5y3x5'x3 y5y4x5'x4 y5y5x5'x5 y5y6x5'x6
y6y1x6'x1 y6y2x6'x2 y6y3x6'x3 y6y4x6'x4 y6y5x6'x5 y6y6x6'x6

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Marc Jakobi
Marc Jakobi 2016-10-15

1 个投票

Well if
y = [ones(3,1); -ones(3,1)]
% or
y = [1;
1;
1;
-1;
-1;
-1];
and x is taken from your previous question, then your result would be.
res = y * y' .* x * x';
This is very basic matrix multiplication. I suggest you read through some tutorials

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