Originally Posted by

**stnickola** Hi everybody. I've been trying to solve some really huge matrix equations in matlab. But, every time, Matlab shows me, besides number and symbols, capital letter "I" or "PI" in a solution.

I need those equations later in other function for ODE45 solver. Ofcourse, ODE doesn't recognise "I" or "PI".

Here it is some sequance from the result:

1.0*(Kp3*x3 + Kv3*x6 + x11*(cos(- 2*x2 - 2/3*PI*(exp(-2*t^3) - 1)

I define Kp3, x3, Kv3 etc. as symbols, but I didn't mention anywhere "PI" or "I".

Does sombody know what is a problem here? And what should to avoide thise.

Thank you for helping me.