Hi Sam,
I understand that you are trying to solve equations using solution from previously solved equations. I am assuming that all variables except “t3”, “t4anti”, “l3” and “l4” are defined and used correctly.
Before solving for “l3” and “l4”, you need to check that “eqn1” and “eqn2” are independent and have unique solutions for “t3” and “t4anti”. If they do not have unique solutions or are dependent on each other, you will need to address that issue before solving for “l3” and “l4”.
If the result for “t3” and “t4anti” is correct, you can directly use them in “eqn3” and “eqn4” as symbol variables. Their value should automatically get substituted. Alternatively, you can use “subs” function to replace old occurrences of a symbolic variable with the new one.
Following is a reference code for usage of “subs” function in your code:
eqn3_sub = subs(eqn3, t3, t3_solution);
final_eqn3 = subs(eqn3_sub, t4anti, t4anti_solution);
eqn4_sub = subs(eqn4, t3, t3_solution);
final_eqn4 = subs(eqn4_sub, t4anti, t4anti_solution);
sol = solve([final_eqn3, final_eqn4], [l3, l4]);
You can refer to the following documentation to read more about the “subs” function:
Hope this helps!
Regards,
Jaynik
