Nothing
spi <-
function(nargs,filename,id,fd,title,output,txlab,tylab)
{
options(max.print=9999999)
dados1=read.table(filename, header = TRUE)
ncolumn=nrow(dados1)
for(m in 2:ncol(dados1))
{
if(m==2)
dat_aux=dados1[,m]
else
{
dat_aux2=rbind(dat_aux,dados1[,m])
dat_aux=dat_aux2
}
}
dados=dat_aux
nlin=nrow(dados)
if (nargs<3){
return("Error: very small number of arguments")
} else {
if (nargs>7){
return("Error: very large number of arguments") }
else if (nargs==3){
tit=paste("Standard Precipitation Index", sep="")
output=2
}
else if (nargs==4){
output=2
}
else {
tit=paste(title,sep="") }
ndates= fd - id + 1
}
data=dados[,1:ncolumn]
dates=seq(id,fd,1)
quad=1:ncolumn
dates_ts=seq(id,fd,1)
for(i in 2:ncolumn)
{
if (i==2) {
data_aux1=rbind( t(data[i-1,]),t(data[i,])) }
else {
data_aux=rbind( data_aux1, t(data[i,]) )
}
}
data2=data_aux
#Routine for Calculating SPI
fit.cdf <- ecdf(data2)
cdfs <- sapply(data,fit.cdf)
SPI <- qnorm(cdfs)
#SPI graph
spi.breaks <- c(-2.4,-2,-1.6,-1.3,-0.8,-0.5,0.5,0.8,1.3,1.6,2,2.4)
spi.cols <- colorRampPalette(c("darkred","red","yellow","white","green","blue","darkblue"),space="rgb")
spi.plot <- matrix(unlist(SPI),nlin,ncolumn) #convert list to matrix for plotting
spi.plot[(spi.plot==Inf)] <- 2.2 #necessary to remove Infs because ecdf is being used
spi.plot[(spi.plot==-Inf)] <- -2.2 #necessary to remove Infs because ecdf is being used
##plot diagram
if (nargs>2){
if (output==1)
{
if (nargs==7)
{
filled.contour(dates_ts,quad,matrix(unlist(spi.plot[,1:ncolumn]),ndates,ncolumn),col=spi.cols(11),xlab=txlab,ylab=tylab,cex.lab=1.1,
font.lab=2,levels=spi.breaks,key.title=tit, las=2, cex.axis=.7,
plot.axes = { axis(1, dates)
axis(2, quad) } )
title(main=title,cex.main=1.1)
} else {
filled.contour(dates_ts,quad,matrix(unlist(spi.plot[,1:ncolumn]),ndates,ncolumn),col=spi.cols(11),xlab="dates",ylab="variables",cex.lab=1.1,
font.lab=2,levels=spi.breaks,key.title=tit, las=2, cex.axis=.7,
plot.axes = { axis(1, dates)
axis(2, quad) } )
title(main=title,cex.main=1.1)
}
} else {
m=data.frame(dates=dates,spi.plot[,1:ncolumn] )
#print(spi.plot)
print(m)
}
} else {
m=data.frame(dates=dates,spi.plot[,1:ncolumn] )
#print(spi.plot)
print(m)
}
} #End spi function
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