spei objects.Generic methods for extracting information and plotting spei objects.
# S3 method for spei
print(x, ...)# S3 method for spei
summary(object, ...)
# S3 method for spei
plot(x, ...)
an object of class spei.
an object of class spei.
additional parameters, not used at present.
This functions allow extracting information and plotting spei objects. print yields the fitted values, i.e. a time series of SPEI or SPI values. summary reports the function call, the parameters of the PDF used, and the time series of SPEI or SPI values. plot produces a plot of the time series of SPEI or SPI values, with blue and red colors for positive and negative values, respectively. If a reference period was used in the function call it is shown by a shaded area. In the unlikely case that NA or Inf values were produced, these are shown by circles.
S.M. Vicente-Serrano, S. Beguer<U+00ED>a, J.I. L<U+00F3>pez-Moreno. 2010. A Multi-scalar drought index sensitive to global warming: The Standardized Precipitation Evapotranspiration Index <U+2013> SPEI. Journal of Climate 23: 1696, DOI: 10.1175/2009JCLI2909.1.