德国数学家 David Hilbert 发现了这样一种可以填满整个单位正方形的分形曲线，称它为 Hilbert 曲线。-German mathematician David Hilbert found such a can fill the entire unit square fractal curve, called it Hilbert curve.

画出每个IMF分量及最后一个剩余分量residual的图形 画出每个IMF分量及剩余分量residual的幅频曲线 用Hilbert变换直接求该信号的瞬时频率 计算HHT时频谱和边际谱-Draw each IMF component and the last one remaining residual component graphics draw each IMF component and the amplitude of the remaining component of the r

填充曲线 即希尔伯特曲线，利用matlab实现(The filling curve is the Hilbert curve, which is implemented by MATLAB.)