Matlab self programming series (1) -- angular distribution function

Self programming calculation of angular distribution function

      Bond angle distribution function is an important structural characterization method , It has become an important means to determine the evolution law of material structure and the state of topological structure in microscopic research methods . Although most of the existing molecular dynamics post-processing software and packages have the function of calculating the bond angle distribution function , but ADF There are still some problems in the calculation of , Mainly in ：（1） The software with simple operation has limited functions , Can't meet the demand ;（2） Some software ADF The calculation is very inaccurate ;（3） The program package that can realize characteristic structure calculation is complex to use , Mostly needed pyth