source: sasview/sansmodels/src/sans/models/c_extensions/HayterMSA.c @ d734a3b1

/**
 * SquareWell Structure factor
 * @author: Jae Hie Cho / UTK
 */

#include "HayterMSA.h"
#include "libStructureFactor.h"
#include <math.h>


/**
 * Function to evaluate 1D scattering function
 * @param pars: parameters of the HayterPenfoldMSA
 * @param q: q-value
 * @return: function value
 */

double HayterMSA_analytical_1D(HayterMSAParameters *pars, double q) {
        double dp[6];
        //Hayer takes diameter.
        dp[0] = 2.0 * pars->effect_radius;
        dp[1] = fabs(pars->charge);
        dp[2] = pars->volfraction;
        dp[3] = pars->temperature;
        dp[4] = pars->saltconc;
        dp[5] = pars->dielectconst;

        return HayterPenfoldMSA(dp, q);
}

/**
 * Function to evaluate 2D scattering function
 * @param pars: parameters of the HayterPenfoldMSA
 * @param q: q-value
 * @return: function value
 */
double HayterMSA_analytical_2D(HayterMSAParameters *pars, double q, double phi) {
        return HayterMSA_analytical_1D(pars,q);
}

double HayterMSA_analytical_2DXY(HayterMSAParameters *pars, double qx, double qy){
        return HayterMSA_analytical_1D(pars,sqrt(qx*qx+qy*qy));
}