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| Hi! I've a very big eight dimensional nonlinear system and I want to transform it into a Matrix xdot = F(x)+B(x)*U On a little example: xdot1 = x^3+u^2*(x+3x^2)+ bx xdot2 = x^2+u*x^2 + b*x F1(x) = x^3; B1(x) = {x+3x^2 , x };... |
| Thanks for your reply! I already tried it with Collect[], unfortunatly I have two input variables **U** = {*F, p*} and I dont know how to collect only those results containing **U**. Collecting **F**(x) is no issue, I set *F* and *p* to zero,... |