# Methods for Irregular Time-Series Objects Methods for irregular time-series objects. ```r ## S3 method for class 'irts' lines(x, type = "l", ...) ## S3 method for class 'irts' plot(x, type = "l", plot.type = c("multiple", "single"), xlab = "Time", ylab = NULL, main = NULL, ylim = NULL, oma = c(6, 0, 5, 0), ...) ## S3 method for class 'irts' points(x, type = "p", ...) ## S3 method for class 'irts' print(x, format = "%Y-%m-%d %H:%M:%S", tz = "GMT", usetz = TRUE, format.value = NULL, ...) ## S3 method for class 'irts' time(x, ...) ## S3 method for class 'irts' value(x, ...) ## S3 method for class 'irts' x[i, j, ...] ``` ## Arguments - `x`: an object of class `"irts"`; usually, a result of a call to `irts`. - `type, plot.type, xlab, ylab, main, ylim, oma`: graphical arguments, see `plot`, `points`, `lines`, `par`, and `plot.ts`. - `format, tz, usetz`: formatting related arguments, see `format.POSIXct`. - `format.value`: a string which specifies the formatting of the values when printing an irregular time-series object. `format.value` is passed unchanged as argument `format` to the function `formatC`. - `i, j`: indices specifying the parts to extract from an irregular time-series object. - ``...``: further arguments passed to or from other methods: for `lines` passed to `lines`; for `plot` passed to `plot`, `plot.default`, and `mtext`; for `points` passed to `points`; for `print` passed to `formatC`; for `time`, `value`, and `[.irts` unused. ## Details `plot` is the method for plotting irregular time-series objects. `points` and `lines` are the methods for drawing a sequence of points as given by an irregular time-series object and joining the corresponding points with line segments, respectively. `print` is the method for printing irregular time-series objects. `time` and `value` are the methods for extracting the sequence of times and the sequence of values of an irregular time-series object. `[.irts` is the method for extracting parts of irregular time-series objects. ## Returns For `time` an object of class `"POSIXct"` representing the sequence of times. For `value` a vector or matrix representing the sequence of values. For `[.irts` an object of class `"irts"` representing the extracted part. For `plot`, `points`, `lines`, and `print` the irregular time-series object. ## Author(s) A. Trapletti ## See Also `irts`, `irts-functions` ## Examples ```r n <- 10 t <- cumsum(rexp(n, rate = 0.1)) v <- rnorm(n) x <- irts(t, v) x time(x) value(x) plot(x) points(x) t <- cumsum(c(t[1], rexp(n-1, rate = 0.2))) v <- rnorm(n, sd = 0.1) x <- irts(t, v) lines(x, col = "red") points(x, col = "red") # Multivariate t <- cumsum(rexp(n, rate = 0.1)) u <- rnorm(n) v <- rnorm(n) x <- irts(t, cbind(u, v)) x x[,1] x[1:3,] x[1:3,1] plot(x) ```

irts-methods function