带双步的QR分解方法求所有特征值，以及反幂法求解对应特征向量-two-steps-qr-descomposure to solve all eigenvalues of a matrix. and antipower method to solve a engenvector correspongding to the eigenvalue

通过经纬度数据，直接计算2点之间的距离，包含VC、VB源代码，以及Excel发式求解的方法。-By latitude and longitude data, direct calculation of the distance between 2 points, including VC, VB source code, as well as Excel hair solution approach.