matplot: Plot Columns of Matrices

Description

Plot the columns of one matrix against the columns of another.

Usage

matplot(x, ...)
# S3 method for default
matplot(x, y, type = "p", lty = 1:5, lwd = 1,
    lend = par("lend"), pch = NULL, col = 1:6, cex = NULL, bg = NA,
    xlab = NULL, ylab = NULL, xlim = NULL, ylim = NULL, ..., add = FALSE,
    verbose = getOption("verbose"))
# S3 method for Date
matplot(x, y, type = "p", lty = 1:5, lwd = 1,
    lend = par("lend"), pch = NULL, col = 1:6, cex = NULL, bg = NA,
    xlab = NULL, ylab = NULL, xlim = NULL, ylim = NULL, ..., add = FALSE,
    verbose = getOption("verbose"))
# S3 method for POSIXct
matplot(x, y, type = "p", lty = 1:5, lwd = 1,
    lend = par("lend"), pch = NULL, col = 1:6, cex = NULL, bg = NA,
    xlab = NULL, ylab = NULL, xlim = NULL, ylim = NULL, ..., add = FALSE,
    verbose = getOption("verbose"))

Arguments

x, y

vectors or matrices of data for plotting. The number of rows should match. If one of them are missing, the other is taken as 'y' and an 'x' vector of '1:n' is used. Missing values ('NA's) are allowed.

type

character string (length 1 vector) or vector of 1-character strings indicating the type of plot for each column of 'y', see 'plot' for all possible 'type's. The first character of 'type' defines the first plot, the second character the second, etc. Characters in 'type' are cycled through; e.g., '"pl"' alternately plots points and lines.

lty, lwd, lend

vector of line types, widths, and end styles. The first element is for the first column, the second element for the second column, etc., even if lines are not plotted for all columns. Line types will be used cyclically until all plots are drawn.

pch

character string or vector of 1-characters or integers for plotting characters, see 'points'. The first character is the plotting-character for the first plot, the second for the second, etc. The default is the digits (1 through 9, 0) then the lowercase and uppercase letters.

col

vector of colors. Colors are used cyclically.

cex

vector of character expansion sizes, used cyclically. This works as a multiple of 'par("cex")'. 'NULL' is equivalent to '1.0'.

vector of background (fill) colors for the open plot symbols given by 'pch=21:25' as in 'points'. The default 'NA' corresponds to the one of the underlying function 'plot.xy'.

xlab, ylab

titles for x and y axes, as in 'plot'.

xlim, ylim

ranges of x and y axes, as in 'plot'.

…

Graphical parameters (see 'par') and any further arguments of 'plot', typically 'plot.default', may also be supplied as arguments to this function. Hence, the high-level graphics control arguments described under 'par' and the arguments to 'title' may be supplied to this function.

add

logical. If 'TRUE', plots are added to current one, using 'points' and 'lines'.

verbose

logical. If 'TRUE', write one line of what is done.

Side Effects

a plot of the functional observations

Details

Note that for multivariate data, a suitable array must first be defined using the par function.

matplot.default calls matplot. The other methods are needed, because the default methods ignore the Date or POSIXct character of x, labeling the horizontal axis as numbers, thereby placing it on the user to translate the numbers of days or seconds since the start of the epoch into dates (and possibly times for POSIXct x).

Examples

Run this code

# NOT RUN {
##
## matplot.Date, matplot.POSIXct
##
# Date
invasion1 <- as.Date('1775-09-04')
invasion2 <- as.Date('1812-07-12')
earlyUS.Canada <- c(invasion1, invasion2)
Y <- matrix(1:4, 2, 2)
matplot(earlyUS.Canada, Y)

# POSIXct
AmRev.ct <- as.POSIXct1970(c('1776-07-04', '1789-04-30'))
matplot(AmRev.ct, Y)

##
## matplot.default (copied from matplot{graphics})
##
matplot((-4:5)^2, main = "Quadratic") # almost identical to plot(*)
sines <- outer(1:20, 1:4, function(x, y) sin(x / 20 * pi * y))
matplot(sines, pch = 1:4, type = "o", col = rainbow(ncol(sines)))
matplot(sines, type = "b", pch = 21:23, col = 2:5, bg = 2:5,
             main = "matplot(...., pch = 21:23, bg = 2:5)")

x <- 0:50/50
matplot(x, outer(x, 1:8, function(x, k) sin(k*pi * x)),
             ylim = c(-2,2), type = "plobcsSh",
             main= "matplot(,type = \"plobcsSh\" )")
## pch & type =  vector of 1-chars :
matplot(x, outer(x, 1:4, function(x, k) sin(k*pi * x)),
             pch = letters[1:4], type = c("b","p","o"))

lends <- c("round","butt","square")
matplot(matrix(1:12, 4), type="c", lty=1, lwd=10, lend=lends)
text(cbind(2.5, 2*c(1,3,5)-.4), lends, col= 1:3, cex = 1.5)

table(iris$Species) # is data.frame with 'Species' factor
iS <- iris$Species == "setosa"
iV <- iris$Species == "versicolor"
op <- par(bg = "bisque")
matplot(c(1, 8), c(0, 4.5), type= "n", xlab = "Length", ylab = "Width",
             main = "Petal and Sepal Dimensions in Iris Blossoms")
matpoints(iris[iS,c(1,3)], iris[iS,c(2,4)], pch = "sS", col = c(2,4))
matpoints(iris[iV,c(1,3)], iris[iV,c(2,4)], pch = "vV", col = c(2,4))
legend(1, 4, c("    Setosa Petals", "    Setosa Sepals",
                    "Versicolor Petals", "Versicolor Sepals"),
            pch = "sSvV", col = rep(c(2,4), 2))

nam.var <- colnames(iris)[-5]
nam.spec <- as.character(iris[1+50*0:2, "Species"])
iris.S <- array(NA, dim = c(50,4,3),
                     dimnames = list(NULL, nam.var, nam.spec))
for(i in 1:3) iris.S[,,i] <- data.matrix(iris[1:50+50*(i-1), -5])

matplot(iris.S[,"Petal.Length",], iris.S[,"Petal.Width",], pch="SCV",
             col = rainbow(3, start = .8, end = .1),
             sub = paste(c("S", "C", "V"), dimnames(iris.S)[[3]],
                         sep = "=", collapse= ",  "),
             main = "Fisher's Iris Data")
par(op)

# }

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