中心点垂直磁场，使用matlab已有的erf误差函数，图形已绘制，绘制偏b比偏t的曲线-The center point of the vertical magnetic field using matlab existing erf error function, the graphics have been drawn, draw partial b than partial t curve

first the pointer of c is a field "zurueckgerueckt" (in the first run so it shows on the last position!) This position is assigned the value of a and b, where also in these the pointer is first a "zurueckgerueckt". This is has repeatedly un