newField(n,d,varName)
This function defines homogeneous vector fields with generic scalar coefficients. By default, the affine coordinates will be x_0,...,x_n and the partial derivatives are denoted as ax_0,...,ax_n, respectively.
In this example we define a homogeneous vector field with linear polynomial coefficients in 3 variables. The scalar coefficients are chosen to be defined with the variable a. The index of the scalar coefficients will always start with 0.
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The object newField is a method function.