hydroTSM (version 0.6-0)

extract: Extract from Zoo

Description

Extracts from a zoo object all the values belonging to a given month, year or weather season.

Usage

extract(x, ...)
# S3 method for default
extract(x, trgt, ...)
     
# S3 method for zoo
extract(x, trgt, ...)

Arguments

x

zoo object

trgt

numeric or character indicating the elements to extract from x. Valid values are: 1) integer(s) from 1 to 12: trgt is considered as month(s) (1=JAN, 2=FEB,...., 12=DEC), and all the values in x belonging to the month(s) specified by trgt will be extracted. 2) integer(s) > 12: trgt is considered as year(s), and all the values in x belonging to the year(s) specified by trgt will be extracted 3) character: trgt is considered as a weather season, and all the values in x belonging to the season specified by trgt will be extracted. Valid values are: -) DJF : December, January, February -) MAM : March, April, May -) JJA : June, July, August -) SON : September, October, November -) DJFM: December, January, February, March -) AM : April, May -) JJAS: June, July, August, September -) ON : October, November

…

further arguments passed to or from other methods

Value

a zoo object with the extracted values.

See Also

time2season, seasonalfunction, daily2annual, daily2monthly

Examples

# NOT RUN {
### Loading temperature data ##
data(SanMartinoPPts)
x <- SanMartinoPPts

## Extracting all the values belonging to February (FEB=2)
extract(x, trgt=2)

## Extracting all the values belonging to February (FEB=2) and April (APR=4)
extract(x, trgt=c(2,4))

## Extracting all the values belonging to the year 1970
extract(x, trgt=1970)

## Extracting all the values belonging to the years 1970 and 1972
extract(x, trgt=c(1970,1972))

## Extracting all the values belonging to the autumn
extract(x, trgt="SON")
# }