'syms' requires Symbolic Math Toolbox. Error in Solve_ergodic_ctmc (line 1) syms p1 p2 p3 p4 p5 p6 I am using trial version Help?

'syms" requires Symbolic Math Toolbox

How do I link Symbolic Math Tool box in trial Matlab version in my script below

syms p1 p2 p3 p4 p5 p6
eqn1 = - p1*0.00074 + p2*30+ p5*2+ p6*0.2 == 0
 eqn2 =  p1*0.00062 - p2*30.00077 == 0;
 eqn3 = p1*0.00012  +0.00031*p2 - p3*0.00012 == 0;
 eqn4 = p2*0.00046 +p3*0.00012- p4*0.00063 == 0;
eqn5 = p4*0.0004 - p5*2 == 0;
eqn6 = p4*0.00023 - p5*0.2 == 0;

 eqn7 = p1+p2+p3+p4+p5+p6==1;
 eqns = [eqn1, eqn2, eqn3, eqn4, eqn5, eqn7]
 sol = solve([eqns],[p1,p2,p3,p4,p5,p6]);
 p1sol = sol.p1
 p2sol = sol.p2

Answer 1

[KSSV]

You need to have symbolic toolbox downloaded. Check

which syms 

This should show the toolbox. I am not sure symbolic tool box is given in trial version or not.

[Vijaya Kumar Kondagunta]

Any alternative to syms

[KSSV]

Write the equations in the form

Ax = b 

Where A is all the coefficients of unknowns and b is your RHS of the equations and solve for unknownx x using:

x = A\b 

Like shown below:

A = [-0.00074 30 0 0 2 0.2 ; 
     0.00062 -30.00077 0 0 0 0 ; 
     0.00012 0.00031 -0.00012 0 0 0 ;
     0 0.00046 0.00012 -0.00063 0 0 ;
     0 0 0 0.0004 -2 0 ;
     0 0 0 0.00023 -0.2 0 ;
     1 1 1 1 1 1 ] ;
 
 b = [0;0;0;0;0;0;1] ;
 
 x = A\b 
 

[Vijaya Kumar Kondagunta]

x=A\b in above is returning Unrecognised function or variable x

Some library of function need to be included in script to execute the above ?