中文说明：水文分析中干旱指标spi的计算代码，可计算多时间尺度的指标，黏贴成m文件即可，文件内有注释描述。
English Description：
The calculation code of drought index SPI in hydrological analysis can calculate indexes of multiple time scales, which can be pasted into m file with annotation description.
Calculation of drought index SPI in hydrological analysis
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中文说明：水文分析中干旱指标spi的计算代码，可计算多时间尺度的指标，黏贴成m文件即可，文件内有注释描述。
English Description：
The calculation code of drought index SPI in hydrological analysis can calculate indexes of multiple time scales, which can be pasted into m file with annotation description.license.txt
SPI.m