Revised drosta2(a package could give drought-length, strngth, and start month/yeat based on giiven monthly mean precipitation). This is revised based on the package uploaded by Yuan Chenyang, and the source file could be accessed on http://www.pudn.com/Download/item/id/1543126.html. The original version lack p_m function, which was aded in this revised version. And file-save function was added in this version.

Filename	Size	Update
给出降水量计算干旱时长、烈度、开始年月\drosta2.m	2159	2018-05-29
给出降水量计算干旱时长、烈度、开始年月	0	2018-05-29

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