The second command produces an error message which A2 is unknown. While the order has already been achieved

>> [A1,A2,A3,A4,A5,A6,A7,A8,A9,A10,A11,A12]=solve(a1,a2,a3,a4,a5,a6,a7,a8,a9,a10,a11,a12);

>> [B2,B3,B4,B5,B6,B7,B8,B9,B10,B11,B12]=solve(b1,b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12);

[Michael Haderlein]

Could you please add the error message? Just to be sure, the error is not at a later line saying that B1 is missing? Because you start with B2 as output.

[Reza]

Error using solve>assignOutputs (line 257)

12 variables does not match 11 outputs.

Error in solve (line 193)

varargout = assignOutputs(nargout,sol,sym(vars));

[Patrik Ek]

You forgot B1

[Reza]

thanks for help

change to

[B2,B3,B4,B5,B6,B7,B8,B9,B10,B11,B12]=solve(b2,b3,b4,b5,b6,b7,b8,b9,b10,b11,b12);

but , A2 is known in second solve