int mom_eval_df ( const gsl_vector *  x,
void *  params,
gsl_matrix *  J 
)

Function that evaluates the gradient of function in Newton's method.

Parameters:
x: vquad pts/wts ector on which function is defined
params: Void pointer passing parameters to compute moments
J: Jacobian matrix for Newton's method

Used for the Newton's method of solving system of non-linear equations to get quadrature points and weights.

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