MATLAB: I want to create a array structure using one,zero,eye

eyematrix arrayoneszeroes

use the ones, zeroes, eye and addressing commands as appropriate to construct the matrix D, by using upto three lines of command.

3 0 0 2 2

0 3 0 2 2

0 0 3 0 0

Thanks in advance

Best Answer

D=[3*eye(3),[2*ones(2);zeros(1,2)]]

You can do it in one line as seen here.

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MATLAB: Help Creating the following matrix

Very easy, really.

A = zeros(3,4);
A(1,1) = 3*eye;
A(1,3) = 2*ones;
A(1,4) = 2*ones;
A(2,2) = 3*eye;
A(2,3) = 2*ones;
A(2,4) = 2*eye;
A(3,3) = 3*ones;
A =
     3     0     2     2
     0     3     2     2
     0     0     3     0

Oh, darn. This is actually your homework, and I just did it for you. (Did you notice I use eye there sometimes, and ones other times, but for absolutely no good reason for that choice?)

Anyways ... maybe, just maybe, there is a shorter way to solve it.

I got it now! This should work, in only one line:

A = [3 0 2 2;0 3 2 2;0 0 3 0]*ones + zeros;

As you can see, it uses both ones and zeros. I could even have included a use of eye in there too.

A = eye(3)*[3 0 2 2;0 3 2 2;0 0 3 0]*ones + zeros;

MATLAB: Using only “eye” and “zeros” …

Definitely possible.

Since this is a homework exercise, I'll just give you one small hint, which might get you unstuck.

To access a portion of a matrix (for example just the upper left part), you can use this syntax:

A = zeros(5,5);
A(1:3,1:3) = magic(3);

Best Answer

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MATLAB: Help Creating the following matrix

MATLAB: Using only “eye” and “zeros” …

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