MATLAB: How to write MATRIX

matrix array

When the programme run I must abtain below

matrix(1,2)=1; matrix(2,1)=1; matrix(1,3)=1; matrix(3,1)=1; matrix(2,3)=1; matrix(3,2)=1;

What can I write instead of question tag in the below matlab programme to obtain matrix(1,2)=1; matrix(2,1)=1; matrix(1,3)=1; matrix(3,1)=1; matrix(2,3)=1; matrix(3,2)=1; ?

%%%%%%%%%%%%%%%%%%%%%%%%%%% clc matrix=zeros(10,10); for i=1:? matrix(?,?) = 1; matrix(?,?) = 1; end

Best Answer

I am not sure to have understood your question but you should try:

M =1-eye(10);

By the way: avoid loops in Matlab ;-) Hope it helps,

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MATLAB: 3D-matrix

A "matrix" is 2D. In consequence a "3D matrix" cannot store anything.

As long, as you do not specify exactly, what you want, it is impossible to give a valuable answer. But of course I can guess, that you want a CELL matrix:

M_coord = {[1,1,1], [1,2,1], [1,3,1]; ...
           [2,1,1], [2,2,1], [2,3,1]; ...
           [3,1,1], [3,2,1], [3,3,1]}

Or perhaps a 3D array:

M_coord = cat(3, [1,1,1; 2,1,1; 3,1,1], ...
                 [1,2,1; 2,2,1; 3,2,1], ...
                 [1,3,1; 2,3,1; 3,3,1]);

MATLAB: How to generate the matrix [1 1; 1 2; 1 3 ; 2 1; 2 2; 2 3; 3 1 ; 3 2 ; 3 3] without loops

I have no idea what your data is, but to generate the matrix in the question try:

out = unique(nchoosek([1:3, 1:3], 2), 'rows');

Best Answer

Related Solutions

MATLAB: 3D-matrix

MATLAB: How to generate the matrix [1 1; 1 2; 1 3 ; 2 1; 2 2; 2 3; 3 1 ; 3 2 ; 3 3] without loops

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