public void ab(int i, double* x, double* a,double *b) { a[0] = this.k1.fV() * (this.theta1.fV() - x[0]); a[1] = this.k2.fV() * (this.theta2.fV() - x[1]); b[0] = AdjSqrt(x[0]) * this.sigma1.fV(); b[1] = AdjSqrt(x[1]) * this.sigma2.fV(); }