If I have 512 matrices (entries of each matrix is looping modulo 2), how the multiplication syntax for those 512*512 matrices ?

this is syntax for define the 512 matrices

clc,clear;

i=0;

modulo=2;

for A=1:modulo

for B=1:modulo

for C=1:modulo

for D=1:modulo

for E=1:modulo

for F=1:modulo

for G=1:modulo

for H=1:modulo

for I=1:modulo

M=[A-1 B-1 C-1 ; D-1 E-1 F-1 ; G-1 H-1 I-1];

i=i+1;

end

end

end

end

end

end

end

end

end

i

[Torsten]

If I have 512 matrices (entries of each matrix is looping modulo 2), how the multiplication syntax for those 512*512 matrices ?

Why 512x512 matrices ? You only have 512 of them.

If you multiply the 512 matrices in arbitrary order, you get the 3x3 zero matrix because one of the 512 matrices is the 3x3 zero matrix.

[Regita Agustin Wahyu F]

i wanna know how the result will be if 512 matrices are multiplied by each itself. next i'll get 262.144 matrices

[Torsten]

You mean

m = 9;
justRows = dec2bin(0:2^m-1)-'0';
n = size(justRows,1);
for i = 1:n
    A = reshape(justRows(i,:),[3,3]);
    M{i} = A;
end
for i=1:n
    for j=1:n
        MM{(i-1)*n+j} = M{i}*M{j};
    end
end

?

[Regita Agustin Wahyu F]

i got error for that syntax

[Torsten]

On my PC, it works fine.

Maybe you changed "m" ?

Then you also have to change the size of the reshaped matrix accordingly:

A = reshape(justRows(i,:),[sqrt(m),sqrt(m)]);

If the error persists, include the code you are using together with the exact error message you receive.

Answer 1

[Torsten]

m = 9;
justRows = dec2bin(0:2^m-1)-'0';
for i = 1:size(justRows,1)
    A = reshape(justRows(i,:),[3,3]);
    M{i} = A;
end