xtable {xtable}R Documentation

Create Export Tables

Description

Function converting an R object to an xtable object, which can then be printed as a LaTeX or HTML table.

Usage

xtable(x, caption=NULL, label=NULL, align=NULL, vsep=NULL, digits=NULL,
       display=NULL, ...)

Arguments

x An R object of class found among methods(xtable). See below on how to write additional method functions for xtable.
caption Character vector of length 1 containing the table's caption or title. Set to NULL to suppress the caption. Default value is NULL.
label Character vector of length 1 containing the LaTeX label or HTML anchor. Set to NULL to suppress the label. Default value is NULL.
align Character vector of length equal to the number of columns of the resulting table indicating the alignment of the corresponding columns. Also, "|" maybe used to produce vertical lines between columns in LaTeX tables, but these are effectively ignored when considering the required length of the supplied vector. If a character vector of length one can be supplied, it is split as strsplit(align,"")[[1]] before processing. Since the row names are printed in the first column, the length of align is one greater than ncol(x) if x is a data.frame. Use "l", "r", and "c" to denote left, right, and center alignment, respectively. Default depends on the class of x.
vsep Character vector with length equal to one or the number of columns in the resulting table + 2 (one for left and one for right margin). These may be any column separators acceptable to LaTeX. Default depends on the class of argument. Ignored in HTML mode.
digits Numeric vector of length equal to the number of columns of the resulting table or matrix of the same size as the resulting table indicating the number of digits to display in the corresponding columns. Since the row names are printed in the first column, the length of the vector digits or the number of columns of the matrix digits is one greater than ncol(x) if x is a data.frame. Default depends of class of x. If values of digits are negative, the corresponding values of x are displayed in scientific format with abs(digits) digits.
display Character vector of length equal to the number of columns of the resulting table indicating the format for the corresponding columns. Since the row names are printed in the first column, the length of display is one greater than ncol(x) if x is a data.frame. These values are passed to the formatC function. Use "d" (for integers), "f", "e", "E", "g", "G", "fg" (for reals), or "s" (for strings). "f" gives numbers in the usual xxx.xxx format; "e" and "E" give n.ddde+nn or n.dddE+nn (scientific format); "g" and "G" put x[i] into scientific format only if it saves space to do so. "fg" uses fixed format as "f", but digits as number of significant digits. Note that this can lead to quite long result strings. Default depends on the class of x.
... Additional arguments. (Currently ignored.)

Details

This function extracts tabular information from x and returns an object of class "xtable". The nature of the table generated depends on the class of x. For example, aov objects produce ANOVA tables while data.frame objects produce a table of the entire data.frame. One can optionally provide a caption (called a title in HTML) or label (called an anchor in HTML), as well as formatting specifications. Default values for align, vsep, digits, and display are class dependent.

The available method functions for xtable are given by methods(xtable). Users can extend the list of available classes by writing methods for the generic function xtable. These methods functions should have x as their first argument with additional arguments to specify caption, label, align, vsep, digits, and display. Optionally, other arguments may be present to specify how the object x should be manipulated. All method functions should return an object whose class if given by c("xtable","data.frame"). The resulting object can have attributes caption and label, but must have attributes align, digits, and display. It is strongly recommened that you set these attributes through the provided replacement functions as they perform validity checks.

Value

An object of class "xtable" which inherits the data.frame class and contains several additional attributes specifying the table formatting options.

Author(s)

David Dahl dahl@stat.tamu.edu with contributions and suggestions from many others (see source code).

See Also

print.xtable, caption, label, align, digits, display, formatC, methods

Examples


## Load example dataset
data(tli)

## Demonstrate data.frame
tli.table <- xtable(tli[1:20,])
digits(tli.table)[c(2,6)] <- 0
print(tli.table)
print(tli.table,type="html")

## Demonstrate data.frame with different digits in cells
tli.table <- xtable(tli[1:20,])
digits(tli.table) <- matrix( 0:4, nrow = 20, ncol = ncol(tli)+1 )
print(tli.table)
print(tli.table,type="html")

## Demonstrate matrix
design.matrix <- model.matrix(~ sex*grade, data=tli[1:20,])
design.table <- xtable(design.matrix)
print(design.table)
print(design.table,type="html")

## Demonstrate aov
fm1 <- aov(tlimth ~ sex + ethnicty + grade + disadvg, data=tli)
fm1.table <- xtable(fm1)
print(fm1.table)
print(fm1.table,type="html")

## Demonstrate lm
fm2 <- lm(tlimth ~ sex*ethnicty, data=tli)
fm2.table <- xtable(fm2)
print(fm2.table)
print(fm2.table,type="html")
print(xtable(anova(fm2)))
print(xtable(anova(fm2)),type="html")
fm2b <- lm(tlimth ~ ethnicty, data=tli)
print(xtable(anova(fm2b,fm2)))
print(xtable(anova(fm2b,fm2)),type="html")

## Demonstrate glm
fm3 <- glm(disadvg ~ ethnicty*grade, data=tli, family=binomial())
fm3.table <- xtable(fm3)
print(fm3.table)
print(fm3.table,type="html")
print(xtable(anova(fm3)))
print(xtable(anova(fm3)),type="html")

## Demonstrate aov
## Taken from help(aov) in R 1.1.1
## From Venables and Ripley (1997) p.210.
N <- c(0,1,0,1,1,1,0,0,0,1,1,0,1,1,0,0,1,0,1,0,1,1,0,0)
P <- c(1,1,0,0,0,1,0,1,1,1,0,0,0,1,0,1,1,0,0,1,0,1,1,0)
K <- c(1,0,0,1,0,1,1,0,0,1,0,1,0,1,1,0,0,0,1,1,1,0,1,0)
yield <- c(49.5,62.8,46.8,57.0,59.8,58.5,55.5,56.0,62.8,55.8,69.5,55.0,
           62.0,48.8,45.5,44.2,52.0,51.5,49.8,48.8,57.2,59.0,53.2,56.0)
npk <- data.frame(block=gl(6,4), N=factor(N), P=factor(P), K=factor(K), yield=yield)
npk.aov <- aov(yield ~ block + N*P*K, npk)
op <- options(contrasts=c("contr.helmert", "contr.treatment"))
npk.aovE <- aov(yield ~  N*P*K + Error(block), npk)
options(op)

summary(npk.aov)
print(xtable(npk.aov))
print(xtable(anova(npk.aov)))
print(xtable(summary(npk.aov)))

summary(npk.aovE)
print(xtable(npk.aovE),type="html")
print(xtable(summary(npk.aovE)),type="html")

## Demonstrate lm
## Taken from help(lm) in R 1.1.1
## Annette Dobson (1990) "An Introduction to Generalized Linear Models".
## Page 9: Plant Weight Data.
ctl <- c(4.17,5.58,5.18,6.11,4.50,4.61,5.17,4.53,5.33,5.14)
trt <- c(4.81,4.17,4.41,3.59,5.87,3.83,6.03,4.89,4.32,4.69)
group <- gl(2,10,20, labels=c("Ctl","Trt"))
weight <- c(ctl, trt)
lm.D9 <- lm(weight ~ group)
print(xtable(lm.D9))
print(xtable(anova(lm.D9)))

## Demonstrate glm
## Taken from help(glm) in R 1.1.1
## Annette Dobson (1990) "An Introduction to Generalized Linear Models".
## Page 93: Randomized Controlled Trial :
counts <- c(18,17,15,20,10,20,25,13,12)
outcome <- gl(3,1,9)
treatment <- gl(3,3)
d.AD <- data.frame(treatment, outcome, counts)
glm.D93 <- glm(counts ~ outcome + treatment, family=poisson())
print(xtable(glm.D93,align="r|llrc"))
print(xtable(anova(glm.D93)),hline.after=c(1),size="small")

## Demonstration of longtable support.
## Remember to insert \usepackage{longtable} on your LaTeX preamble
x <- matrix(rnorm(1000), ncol = 10)
x.big <- xtable(x,label='tabbig',caption='Example of longtable spanning several pages')
print(x.big,tabular.environment='longtable',floating=FALSE) 
x <- x[1:30,]
x.small <- xtable(x,label='tabsmall',caption='regular table env')
print(x.small)  # default, no longtable 

if(require(stats,quietly=TRUE)) {
  ## Demonstrate prcomp
  ## Taken from help(prcomp) in mva package of R 1.1.1
  data(USArrests)
  pr1 <- prcomp(USArrests)
  print(xtable(pr1))
  print(xtable(summary(pr1)))

#  ## Demonstrate princomp
#  ## Taken from help(princomp) in mva package of R 1.1.1
#  pr2 <- princomp(USArrests)
#  print(xtable(pr2))
}

 


[Package xtable version 1.3-0 Index]