R: Icing Days

climdex.id {climdex.pcic} | R Documentation

## Icing Days

### Description

This function computes the climdex index ID.

### Usage

    climdex.id(ci)

### Arguments

`ci` | Object of type climdexInput.

### Details

This function takes a climdexInput object as input and computes the ID (icing days) climdex index: that is, the annual count of days where daily maximum temperature is below 0 degrees Celsius.

### Value

A vector containing the number of icing days for each year.

### References

http://etccdi.pacificclimate.org/list_27_indices.shtml

### See Also

`climdexInput.raw`, `climdexInput.csv`.

### Examples

    library(PCICt)

    ## Create a climdexInput object from some data already loaded in and
    ## ready to go.

    ## Parse the dates into PCICt.
    tmax.dates <- as.PCICt(do.call(paste, ec.1018935.tmax[,c("year",
    "jday")]), format="%Y %j", cal="gregorian")
    tmin.dates <- as.PCICt(do.call(paste, ec.1018935.tmin[,c("year",
    "jday")]), format="%Y %j", cal="gregorian")
    prec.dates <- as.PCICt(do.call(paste, ec.1018935.prec[,c("year",
    "jday")]), format="%Y %j", cal="gregorian")

    ## Load the data in.
    ci <- climdexInput.raw(ec.1018935.tmax$MAX_TEMP,
    ec.1018935.tmin$MIN_TEMP, ec.1018935.prec$ONE_DAY_PRECIPITATION,
    tmax.dates, tmin.dates, prec.dates, base.range=c(1971, 2000))

    ## Create an annual timeseries of the number of icing days.
    id <- climdex.id(ci)

[Package climdex.pcic version 1.1-11 Index]