solve command

Dear all, i have problem with solve command, this is my program:

H=[1 2 3; 4 5 6; 7 8 9]
S=[11 22 33; 44 55 66 ;77 88 99]
syms e11 e12 e13 e21 e22 e23 e31 e32 e33
E=[e11 e12 e13;e21 e22 e23;e31 e32 e33]
HMES=H-E*S
DE=solve('HMES(1,1)','HMES(1,2)','HMES(1,3)','HMES(2,1)','HMES(2,2)','HMES(2,3)','HMES(3,1)','HMES(3,2)','HMES(3,3)')
EI(1,1)=DE.e11;
EI(1,2)=DE.e12;
EI(1,3)=DE.e13;
EI(2,1)=DE.e21;
EI(2,2)=DE.e22;
EI(2,3)=DE.e23;
EI(3,1)=DE.e11;
EI(3,2)=DE.e12;
EI(3,3)=DE.e13;

this is Error:

??? Error using ==> subsref
Reference to non-existent field 'e11'.

Error in ==> sym.subsref at 16
  y = builtin('subsref',struct(x),a);

Error in ==> Un55555titled at 11
EI(1,1)=DE.e11;

????

Answer 1

[Taniadi]

Are you trying to solve a system of linear equations? I found difficulties in using solve. If you want to solve linear equations numerically (and using a number), why don't you try to solve using fsolve or using matrix operations? I think that is easier.

Answer 2

[Walter Roberson]

Remove the quotes.

DE = solve(HMES(1,1), HMES(1,2), HMES(1,3), HMES(2,1), HMES(2,2), HMES(2,3), HMES(3,1), HMES(3,2), HMES(3,3));