Cell Array and Matrix polynimial

How do I subtract matrix polynomials? I want to subtract D which is a cell array from Y a matrix polynomial

syms s
X=[1 2 3 4; 5 6 7 8];
Y=(s-2)*X;
D = {[1 2 ] , [1 3] ; [1 6] , [5 2]  };
M=Y-D

Currently i'm getting error for this code saying 'Error using mupadmex Cell input must have string contents.'

Answer 1

[Azzi Abdelmalek]

 syms s
X=[1 2 3 4; 5 6 7 8];
Y=(s-2)*X;
D = {[1 2 ] , [1 3] ; [1 6] , [5 2]  };
M=Y-cell2mat(D)

[RoboKid]

What if the size of matrix,cell2mat(D) doesn't match with Y. i.e for the same program what if D = {[1 2 7] , [1 3 8] ; [1 6 7] , [5 2 9] }

--Thanks

[Azzi Abdelmalek]

Then you have to explain what you want ?

[RoboKid]

I'm trying to solve generalized Bezout identity for MIMO system as mentioned in the following paper https://www.dropbox.com/sh/tokqmnjbs6m8nem/amHkp4MlVY. There I have to subtract Denominator matrix array D, from (s-2)*K (K is transpose of state feedback matrix). I need a generalized program , works for any D . Is there anyway other than cell2mat?

--Thanks

[RoboKid]

syms s X=[1 2 3 4; 5 6 7 8]; Y=(s-2)*X; D = {[1 2 ] , [1 3] ; [1 6] , [5 2] }; t=mat2cell(Y) M=gsubtract(t,D)

I modified the program as above so that both Y and D are cell. But the problem now is Y is of class 'sym' and D is of class 'Double' . Is there anyway to change the class of D to sym from Double.

--Thanks

[Azzi Abdelmalek]

Sorry, I'am not following you

[RoboKid]

Is there anyway to change the class of D to sym from Double.

[Azzi Abdelmalek]

cellfun(@(x) sym(x),D,'un',0)

In your case D is not double, it's cell