MathExt.h

#include <math.h>
#include <QPointF>

#ifndef M_PI        /* sometimes defined in math.h */
#define M_PI        3.14159265358979323846
#endif
double fermi(double x, double max, double T, double x0);
float distance(double lat1, double lon1, double lat2, double lon2);
double** SymMatrixtoTriang(double** m, int dim, short returnlower);
double** CreateMatrix(int dimx, int dimy);
double** CopyMatrix(double** m, int dimx,int dimy);
void DeleteMatrix(double** m, int dimx);
void TranspondMatrix(double** m, int dim);
double** MatrixMatrix(double** m1, int dim1, double** m2, int dim2);
double* SymLGS(double** A, double* y, int dim);

double* FitPolynom(QPointF* p, int pointcount, int grad);
double fpln(double x, double* p, int grad);
double upperscale(float f);
double lattomercator(double lat);   
double mercatortolat(double mlat);