里面的公式是用于拟合颗粒粒径分布的，根据情况可以换成别的公式拟合。我不太懂得怎么优化MATLAB的算法，现在运算一次大约要2分钟吧。-The formula is used to fit inside the particle size distribution can be replaced by other formulas depending on the circumstances fit. I do not know how MATLAB optimization algorithm,