# plot.zoo

##### Plotting zoo Objects

Plotting method for objects of class `"zoo"`

.

- Keywords
- ts

##### Usage

```
## S3 method for class 'zoo':
plot(x, y = NULL, screens, plot.type,
panel = lines, xlab = "Index", ylab = NULL, main = NULL,
xlim = NULL, ylim = NULL, xy.labels = FALSE, xy.lines = NULL,
oma = c(6, 0, 5, 0), mar = c(0, 5.1, 0, 2.1),
col = 1, lty = 1, pch = 1, type = "l", nc, widths = 1, heights = 1, ...)
## S3 method for class 'zoo':
lines(x, y = NULL, type = "l", \dots)
## S3 method for class 'zoo':
points(x, y = NULL, type = "p", \dots)
```

##### Arguments

- x
- an object of class
`"zoo"`

. - y
- an object of class
`"zoo"`

. If`y`

is`NULL`

(the default) a time series plot of`x`

is produced, otherwise if both`x`

and`y`

are univariate`"zoo"`

series, a scatt - screens
- factor (or coerced to factor) whose levels specify which
graph each series is to be plotted in.
`screens=c(1,2,1)`

would plot series 1, 2 and 3 in graphs 1, 2 and 1. If not specified then 1 is used if`plot.type="single"`

- plot.type
- for multivariate zoo objects, "multiple" plots the
series on multiple plots and "single" superimposes them on a single
plot. Default is "single" if
`screens`

has only one level and`"multiple"`

otherwise. If neither - panel
- a
`function(x, y, col, lty, ...)`

which gives the action to be carried out in each panel of the display for`plot.type = "multiple"`

. - ylim
- if
`plot.type = "multiple"`

then it can be a list of y axis limits. If not a list each graph has the same limits. If any list element is not a pair then its range is used instead. If`plot.type = "single"`

then it is as - xy.labels
- logical, indicating if
`text`

labels should be used in the scatter plot, or character, supplying a vector of labels to be used. - xy.lines
- logical, indicating if
`lines`

should be drawn in the scatter plot. Defaults to the value of`xy.labels`

if that is logical, otherwise to`FALSE`

. - xlab, ylab, main, xlim, oma, mar
- graphical arguments, see
`par`

. - col, lty, pch, type
- graphical arguments that can be vectors or (named) lists. See the details for more information.
- nc
- the number of columns to use when
`plot.type = "multiple"`

. Defaults to`1`

for up to`4`

series, otherwise to`2`

. - widths, heights
- widths and heights for individual graphs, see
`layout`

. - ...
- additional graphical arguments.

##### Details

The methods for `plot`

and `lines`

are very similar
to the corresponding `ts`

methods. However, the handling of
several graphical parameters is more flexible for multivariate series.
These parameters can be vectors of the same length as the number of
series plotted or are recycled if shorter. They can also be (partially)
named list, e.g., `list(A = c(1,2), c(3,4))`

in which `c(3, 4)`

is the default value and `c(1, 2)`

the value only for series `A`

.
The `screens`

argument can be specified in a similar way.
If `plot.type`

and `screens`

conflict then multiple plots
will be assumed. Also see the examples.

In the case of a custom panel the panel can reference
`parent.frame$panel.number`

in order to determine which
frame the panel is being called from. See examples.

`par(mfrow=...)`

and `Axis`

can be used in conjunction with
single panel plots in the same way as with other classic graphics.

For multipanel graphics, `plot.zoo`

takes over the layout so
`par(mfrow=...)`

cannot be used. `Axis`

can be used within
the panels themselves but not outside the panel. See examples.

In addition to classical time series line plots, there is also a
simple `barplot`

method for `"zoo"`

series.

##### See Also

##### Examples

```
## example dates
x.Date <- as.Date(paste(2003, 02, c(1, 3, 7, 9, 14), sep = "-"))
## univariate plotting
x <- zoo(rnorm(5), x.Date)
x2 <- zoo(rnorm(5, sd = 0.2), x.Date)
plot(x)
lines(x2, col = 2)
## multivariate plotting
z <- cbind(x, x2, zoo(rnorm(5, sd = 0.5), x.Date))
plot(z, type = "b", pch = 1:3, col = 1:3, ylab = list(expression(mu), "b", "c"))
colnames(z) <- LETTERS[1:3]
plot(z, screens = 1, col = list(B = 2))
plot(z, type = "b", pch = 1:3, col = 1:3)
plot(z, type = "b", pch = list(A = 1:5, B = 3), col = list(C = 4, 2))
plot(z, type = "b", screen = c(1,2,1), col = 1:3)
# right axis is for broken lines
plot(x)
opar <- par(usr = c(par("usr")[1:2], range(x2)))
lines(x2, lty = 2)
# axis(4)
Axis(side = 4)
par(opar)
## Custom x axis labelling using a custom panel.
# 1. test data
z <- zoo(c(21, 34, 33, 41, 39, 38, 37, 28, 33, 40),
as.Date(c("1992-01-10", "1992-01-17", "1992-01-24", "1992-01-31",
"1992-02-07", "1992-02-14", "1992-02-21", "1992-02-28", "1992-03-06",
"1992-03-13")))
zz <- merge(a = z, b = z+10)
# 2. axis tick for every point. Also every 3rd point labelled.
my.panel <- function(x, y, ..., pf = parent.frame()) {
fmt <- "%b-%d" # format for axis labels
lines(x, y, ...)
# if bottom panel
if (with(pf, length(panel.number) == 0 ||
panel.number %% nr == 0 || panel.number == nser)) {
# create ticks at x values and then label every third tick
Axis(side = 1, at = x, labels = FALSE)
ix <- seq(1, length(x), 3)
labs <- format(x, fmt)
Axis(side = 1, at = x[ix], labels = labs[ix], tcl = -0.7, cex.axis = 0.7)
}
}
# 3. plot
plot(zz, panel = my.panel, xaxt = "n")
# with a single panel plot a fancy x-axis is just the same
# procedure as for the ordinary plot command
plot(zz, screen = 1, col = 1:2, xaxt = "n")
# axis(1, at = time(zz), labels = FALSE)
tt <- time(zz)
Axis(side = 1, at = tt, labels = FALSE)
ix <- seq(1, length(tt), 3)
fmt <- "%b-%d" # format for axis labels
labs <- format(tt, fmt)
# axis(1, at = time(zz)[ix], labels = labs[ix], tcl = -0.7, cex.axis = 0.7)
Axis(side = 1, at = tt[ix], labels = labs[ix], tcl = -0.7, cex.axis = 0.7)
legend("bottomright", colnames(zz), lty = 1, col = 1:2)
## plot a mulitple ts series with nice x-axis using panel function
tab <- ts(cbind(A = 1:24, B = 24:1), start = c(2006, 1), freq = 12)
pnl.xaxis <- function(...) {
lines(...)
panel.number <- parent.frame()$panel.number
nser <- parent.frame()$nser
# if bottom panel
if (!length(panel.number) || panel.number == nser) {
tt <- list(...)[[1]]
ym <- as.yearmon(tt)
mon <- as.numeric(format(ym, "%m"))
yy <- format(ym, "%y")
mm <- substring(month.abb[mon], 1, 1)
# axis(1, tt[mon == 1], yy[mon == 1], cex.axis = 0.7)
Axis(side = 1, at = tt[mon == 1], labels = yy[mon == 1], cex.axis = 0.7)
# axis(1, tt[mon > 1], mm[mon > 1], cex.axis = 0.5, tcl = -0.3)
Axis(side = 1, at = tt[mon > 1], labels = mm[mon > 1], cex.axis = 0.5, tcl = -0.3)
}
}
plot(as.zoo(tab), panel = pnl.xaxis, xaxt = "n", main = "Fancy X Axis")
## Another example with a custom axis
# test data
z <- zoo(matrix(1:25, 5), c(10,11,20,21))
colnames(z) <- letters[1:5]
plot(zoo(coredata(z)), xaxt = "n", panel = function(x, y, ..., Time = time(z)) {
lines(x, y, ...)
# if bottom panel
pf <- parent.frame()
if (with(pf, panel.number %% nr == 0 || panel.number == nser)) {
Axis(side = 1, at = x, labels = Time)
}
})
## plot with left and right axes
## modified from http://www.mayin.org/ajayshah/KB/R/html/g6.html
set.seed(1)
z <- zoo(cbind(A = cumsum(rnorm(100)), B = cumsum(rnorm(100, mean = 0.2))))
opar <- par(mai = c(.8, .8, .2, .8))
plot(z[,1], type = "l",
xlab = "x-axis label", ylab = colnames(z)[1])
par(new = TRUE)
plot(z[,2], type = "l", ann = FALSE, yaxt = "n", col = "blue")
# axis(4)
Axis(side = 4)
legend(x = "topleft", bty = "n", lty = c(1,1), col = c("black", "blue"),
legend = paste(colnames(z), c("(left scale)", "(right scale)")))
usr <- par("usr")
# if you don't care about srt= in text then mtext is shorter:
# mtext(colnames(z)[2], 4, 2, col = "blue")
text(usr[2] + .1 * diff(usr[1:2]), mean(usr[3:4]), colnames(z)[2],
srt = -90, xpd = TRUE, col = "blue")
par(opar)
# automatically placed point labels
library("maptools")
pointLabel(time(z), coredata(z[,2]), labels = format(time(z)), cex = 0.5)
## plot one zoo series against the other.
plot(x, x2)
plot(x, x2, xy.labels = TRUE)
plot(x, x2, xy.labels = 1:5, xy.lines = FALSE)
## barplot
x <- zoo(cbind(rpois(5, 2), rpois(5, 3)), x.Date)
barplot(x, beside = TRUE)
# interactive plotting
library("TeachingDemos")
tke.test1 <- list(Parameters = list(
pch = list("spinbox", init = 1, from = 0, to = 255, width = 5),
cex = list("slider", init = 1.5, from = 0.1, to = 5, resolution = 0.1),
type = list("combobox", init = "b",
values = c("p", "l", "b", "o", "c", "h", "s", "S", "n"), width = 5),
lwd = list("spinbox", init = 1, from = 0, to = 5, increment = 1, width = 5),
lty = list("spinbox", init = 1, from = 0, to = 6, increment = 1, width = 5)
))
z <- zoo(rnorm(25))
tkexamp(plot(z), tke.test1, plotloc = "top")
```

*Documentation reproduced from package zoo, version 1.5-4, License: GPL-2*