solving equation returns 0x1 sym
42 views (last 30 days)
I want to solve this example from a book:
This is the code:
syms r11 r12 r13 r21 r22 r23 r31 r32 r33
r11=0.766; r12=0; r13=0.643; r22=0.5;
GRB=[r11 r12 r13; r21 r22 r23; r31 r32 r33]
Y=solve(BRGGRB==eye(3),[r21 r23 r31 r32 r33])
But when using the solver I keep getting empty fields. I've read some other answered questions with the same problem but couldn't figure the reason for mine.
Kumar Pallav on 2 Sep 2021
The equation is not valid for any values of [r21 r23 r31 r32 r33]. If you change r11=1, and r13=0, you could see an output, as then the equation becomes valid.
You could see that BRGGRB(1,1) value is approximately 1 but not exactly 1. Hence, when you solve it by equating to identity matrix, it does not equate. You could try writing equations separately (refer this) and solve the equation.