to define a matrix which is not a variable

[Rahul Radhakrishnan]

i need to define a matrix which is of the form A'=[A B 0 0 D], where A is of order 2x2, B of order 2x2 and D of order 2x1. all are system matrices and are available. i cant use blkvar right???? order of zero blocks are also 2x2.

[Johan Löfberg]

No, you cannot use blkvar here since the 0-blocks are not uniquely determined (they could be 2x1, 2x2,2x3,...)

Absolutely no reason to use blkvar though (I never use it). Simply define the matrix using standard code

A= sdpvar(2,2,'full')%Or symmetric?
B= sdpvar(2,2,'full')%Or symmetric?
D= sdpvar(2,1)
Aprime =[AB zeros(2,4) D];

[Rahul Radhakrishnan]

sir A,B & D are not variables, they are known matrices. zero blocks should be of order 2x2, so that dimensions are matched.
using standard code, i have checked, but error is there.
Aprime is a 1x5 matrix in appearance.
since A is 2x2, B is 2x2 & D is 2x1 and zeros(2x4), Aprime order should be 2x9.
how should i define it sir??

[Johan Löfberg]

So what is the problem? Just concatenate your data matrices and you are done, or show some code, with error messages which illustrates you issues