Figure 9
From: Soft computing models for prediction of bentonite plastic concrete strength
Expression tree representation of GEP equation. The variables \({\text{d}}_{0},{\text{d}}_{1},{\text{d}}_{2},\dots\) etc. in the expression trees correspond to \({\text{x}}_{0},{\text{x}}_{1},{\text{x}}_{2},\dots\) in the equation.
