Solve bugs in penman() function and implement better argument checking.

sbegueria / SPEI

An R package for computing the Standardized Precipitation-Evapotranspiration Index (SPEI), Penman-Monteith and other reference evapotranspiration, SPI, etc.

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Solve bugs in penman() function and implement better argument checking. #31

Closed sbegueria closed 2 years ago

sbegueria commented 2 years ago

Correcting several bugs in the penman() function.