R: Display text information in a graphics plot.

textplot {gplots} | R Documentation

## Display text information in a graphics plot.

### Description

This function displays text output in a graphics window. It is the equivalent of 'print' except that the output is displayed as a plot.

### Usage

    textplot(object, halign="center", valign="center", cex, ...)
    ## Default S3 method:
    textplot(object, halign=c("center","left","right"),
             valign=c("center", "top", "bottom"), cex, ... )
    ## S3 method for class 'character'
    textplot(object, halign = c("center", "left", "right"),
             valign = c("center", "top", "bottom"), cex, fixed.width=TRUE,
             cspace=1, lspace=1, mar=c(0, 0, 3, 0) + 0.1,
             tab.width = 8, ...)
    ## S3 method for class 'data.frame'
    textplot(object, halign = c("center", "left", "right"),
             valign = c("center", "top", "bottom"), cex, ...)
    ## S3 method for class 'matrix'
    textplot(object, halign = c("center", "left", "right"),
             valign = c("center", "top", "bottom"), cex, cmar = 2,
             rmar = 0.5, show.rownames = TRUE, show.colnames = TRUE,
             hadj = 1, vadj = 1, mar = c(1, 1, 4, 1) + 0.1,
             col.data = par("col"), col.rownames = par("col"),
             col.colnames = par("col"), ...)

### Arguments

`object` | Object to be displayed.
`halign` | Alignment in the x direction, one of "center", "left", or "right".
`valign` | Alignment in the y direction, one of "center", "top" , or "bottom"
`cex` | Character size, see `par` for details. If unset, the code will attempt to use the largest value which allows the entire object to be displayed.
`fixed.width` | Logical value indicating whether to emulate a fixed-width font by aligning characters in each row of text. This is usually necessary for text-formatted tables display properly. Defaults to 'TRUE'.
`cspace` | Space between characters as a multiple of the width of the letter 'W'. This only applies when `fixed.width==TRUE`.
`lspace` | Line spacing. This only applies when `fixed.width==TRUE`.
`mar` | Figure margins, see the documentation for `par`.
`rmar, cmar` | Space between rows or columns, in fractions of the size of the letter 'M'.
`show.rownames, show.colnames` | Logical value indicating whether row or column names will be displayed.
`hadj,vadj` | Vertical and horizontal location of elements within matrix cells. These have the same meaning as the `adj` graphics paramter (see `par`).
`col.data` | Colors for data elements. If a single value is provided, all data elements will be the same color. If a matrix matching the dimensions of the data is provided, each data element will receive the specified color.
`col.rownames, col.colnames` | Colors for row names and column names, respectively. Either may be specified as a scalar or a vector of appropriate length.
`tab.width` | Width of a single tab stop, in characters
`...` | Optional arguments passed to the text plotting command or specialied object methods

### Details

A new plot is created and the object is displayed using the largest font that will fit on in the plotting region. The `halign` and `valign` parameters can be used to control the location of the string within the plotting region.

For matrixes and vectors a specialized textplot function is available, which plots each of the cells individually, with column widths set according to the sizes of the column elements. If present, row and column labels will be displayed in a bold font.

### Value

The character scaling factor (`cex`) used.

### Author(s)

Gregory R. Warnes greg@warnes.net

### See Also

`plot`, `text`, `capture.output`

### Examples

    ## Not run:
    ### simple examples
    # show R version information
    textplot(version)

    # show the alphabet as a single string
    textplot( paste(letters[1:26], collapse=" ") )

    # show the alphabet as a matrix
    textplot( matrix(letters[1:26], ncol=2))

    ### Make a nice 4 way display with two plots and two text summaries

    data(iris)
    par(mfrow=c(2,2))
    plot( Sepal.Length ~ Species, data=iris, border="blue", col="cyan",
          main="Boxplot of Sepal Length by Species" )
    plotmeans( Sepal.Length ~ Species, data=iris, barwidth=2, connect=FALSE,
               main="Means and 95% Confidence Intervals\nof Sepal Length by Species")

    info <- sapply( split(iris$Sepal.Length, iris$Species),
                    function(x) round(c(Mean=mean(x), SD=sd(x), N=gdata::nobs(x)),2) )

    textplot( info, valign="top"  )
    title("Sepal Length by Species")

    reg <- lm( Sepal.Length ~ Species, data=iris )
    textplot( capture.output(summary(reg)), valign="top")
    title("Regression of Sepal Length by Species")

    par(mfrow=c(1,1))

    ### Show how to control text color
    cols <- c("red", "green", "magenta", "forestgreen")
    mat <- cbind(name=cols, t(col2rgb(cols)), hex=col2hex(cols))

    textplot(mat,
             col.data=matrix(cols, nrow=length(cols), byrow=FALSE, ncol=5),
             )

    ### Show how to manually tune the character size
    data(iris)
    reg <- lm( Sepal.Length ~ Species, data=iris )
    text <- capture.output(summary(reg))

    # do the plot and capture the character size used
    textplot(text, valign="top")

    # see what size was used
    cex

    # now redo the plot at 80% size
    textplot( text, valign="top", cex=cex*0.80)

    ## End(Not run)

[Package gplots version 3.0.1 Index]