# place matrix in array part 2

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monkey_matlab on 15 Oct 2016
Answered: Marc Jakobi on 15 Oct 2016
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

Marc Jakobi on 15 Oct 2016
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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