View source: R/print.data.table.R
print.data.table | R Documentation |
print.data.table
extends the functionalities of print.data.frame
.
Key enhancements include automatic output compression of many observations and concise column-wise class
summary.
## S3 method for class 'data.table' print(x, topn=getOption("datatable.print.topn"), # default: 5 nrows=getOption("datatable.print.nrows"), # default: 100 class=getOption("datatable.print.class"), # default: FALSE row.names=getOption("datatable.print.rownames"), # default: TRUE col.names=getOption("datatable.print.colnames"), # default: "auto" print.keys=getOption("datatable.print.keys"), # default: FALSE trunc.cols=getOption("datatable.print.trunc.cols"), # default: FALSE quote=FALSE, timezone=FALSE, ...)
x |
A |
topn |
The number of rows to be printed from the beginning and end of tables with more than |
nrows |
The number of rows which will be printed before truncation is enforced. |
class |
If |
row.names |
If |
col.names |
One of three flavours for controlling the display of column names in output. |
print.keys |
If |
trunc.cols |
If |
quote |
If |
timezone |
If |
... |
Other arguments ultimately passed to |
By default, with an eye to the typically large number of observations in a data.table
, only the beginning and end of the object are displayed (specifically, head(x, topn)
and tail(x, topn)
are displayed unless nrow(x) < nrows
, in which case all rows will print).
print.default
#output compression DT <- data.table(a = 1:1000) print(DT, nrows = 100, topn = 4) #`quote` can be used to identify whitespace DT <- data.table(blanks = c(" 12", " 34"), noblanks = c("12", "34")) print(DT, quote = TRUE) #`class` provides handy column type summaries at a glance DT <- data.table(a = vector("integer", 3), b = vector("complex", 3), c = as.IDate(paste0("2016-02-0", 1:3))) print(DT, class = TRUE) #`row.names` can be eliminated to save space DT <- data.table(a = 1:3) print(DT, row.names = FALSE) #`print.keys` can alert which columns are currently keys DT <- data.table(a=1:3, b=4:6, c=7:9, key="b,a") setindexv(DT, c("a", "b")) setindexv(DT, "a") print(DT, print.keys=TRUE) # `trunc.cols` will make it so only columns that fit in console will be printed # with a message that states the variables not shown old_width = options("width" = 40) DT <- data.table(thing_11 = vector("integer", 3), thing_21 = vector("complex", 3), thing_31 = as.IDate(paste0("2016-02-0", 1:3)), thing_41 = "aasdfasdfasdfasdfasdfasdfasdfasdfasdfasdf", thing_51 = vector("integer", 3), thing_61 = vector("complex", 3)) print(DT, trunc.cols=TRUE) options(old_width)
Add the following code to your website.
For more information on customizing the embed code, read Embedding Snippets.