place matrix in array part 2

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monkey_matlab
monkey_matlab 2016-10-15
回答： Marc Jakobi 2016-10-15
This post is building from the post found here.
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
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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