stackplot: Stacked Plotting

In wavelets: Functions for Computing Wavelet Filters, Wavelet Transforms and Multiresolution Analyses

Description

Plot an object as a stacked set of plots, plotting each column using the same x-axis and plotting the y-values at the same scale with an offset equal to the magnitude of each column vector.

Usage

stackplot(x, y = NULL, type = "h", axes.labels = FALSE,
xlab = "", ylab = "", y.llabs = NULL, y.rlabs = NULL, draw.divides =
TRUE, xtick.at = NULL, ytick.at = NULL, col = "black", main = "")

Arguments

x	Specifies the coordinates of the points to be plotted. Alternatively, x can be a list containing matrices representing the values to be plotted, or a time series object. The x-values will be specified by the rownames of each matrix. The y-values, or offsets of each level, will be represented by the values of the elements in the columns of each matrix.
y	If x specifies the coordinates of the points to be plotted, then y can be a list containing matrices that represent the values to be plotted. The y-values, or offsets of each level will be represented by the values of the elements in the columns of each matrix.
type	Type of plots to be drawn. Currently only h, or histogram, and l, or lines, are implemented.
axes.labels	Boolean representing whether or not to display the numeric labels of the horizontal and vertical axes.
xlab	String indicating the label for the horizontal x-axis.
ylab	String indicating the label for the vertical y-axis.
y.llabs	Vector or list of labels to be placed on left side of plot.
y.rlabs	Vector or list of labels to be placed on right side of plot.
draw.divides	Logical value indicating whether to draw lines to separate each subplot in the stackplot.
xtick.at	Vector specifying the tick mark locations on the horizontal axis of the plot. Defaulted to par("xaxp").
ytick.at	Vector specifying the tick mark locations on the vertical axis of the plot. Defaulted to par("yaxp").
col	String representing color of plot.
main	String representing the title of the plot.

Details

Each object specified by x or y will be coerced into a list, and each object of the list will be coerced into a matrix using the function as.matrix. Each column of a matrix will represent the vertical y-values for each individual plot in the stacked plot. Horizontal x-values are discussed below.

stackplot will plot a matrix of values as a series of stacked plots, where the individual columns are plotted using the same x and y scales, but offset by the magnitude (= abs(max-min)) of the column.

If the object to be plotted is a Time Series object, the start and end values of the object will represent the first and last horizontal x-values of the points to be plotted. The Time Series will be coerced into matrix.

The limits of the horizontal x-axis and vertical y-axis will be dictated by the data in the first object of the list.

If the object to be plotted is a list of matrices, and x is not specified, the horizontal x-values of the points to be plotted for a given matrix will default to the rownames of that matrix. The rownames can be either numeric or character. If the first matrix of the list does not have rownames, then the horizontal x-values for each matrix (and its corresponding plot) will default to range from 1 to the length of the columns of the respective matrix.

If the first matrix of the list does have specified rownames, then the horizontal x-values assume the values of the rownames of the respective matrix. However, if another matrix of the list does not have specified rownames, then its horizontal x-values will default to range from 1 to the length of the columns of that respective matrix.

The user can specify the type of plot (currently only "h" and "l") to be drawn for every element of the list in x or y using the vector type. If the Nth element (N>1) in type is NA and the Nth element of the list in x or y exists, then the type of plot for the Nth element of the list will be equal to the type of plot for the N-1th element of the list. Similarly for col, which specifies the colors for each element of the list in x or y.

The labels y.llabs and y.rlabs will be placed at the "zero" lines of each individual plot starting from the bottom working up to the top.

Author(s)

Kelvin Ma, [e-mail]

See Also

plot.dwt and plot.modwt

Examples

A <- array(c(1,2,3,4), c(3,4))

# Plotting the vectors c(1,2,3), c(4,1,2), c(3,4,1), and c(2,3,4) in a
# stacked plot with 4 separate plots).  The x-values will be 1:3.
stackplot(A)

#Plotting A with numeric labels on the axis and making the plot "red".
#Also labeling the x-axis with "X-Label", and the y-axis with "Y-Label".
stackplot(A, axes.labels = TRUE, xlab = "X-Label", ylab = "Y-Label")

timeSeries <- ts(A)
# Plotting the Time Series created by coercing the array A into a Time
# Series.  Observe that this plot similar to the plot in the first example.
stackplot(timeSeries)

lfig <- 2:11
hfig <- 1:10
# Plotting a stacked plot of two types: histogram and lines.  Where the
# line joins the points (1,2) and (10,11), and the histogram is similar to
# the histogram formed by entering plot(1:10, type = "h").  The line will
# be red and the histogram will be yellow.
stackplot(list(lfig, hfig), type = c("l", "h"), col = c("red", "yellow"))

wavelets documentation built on March 26, 2020, 6:50 p.m.