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<TITLE>ESS -- Emacs Speaks Statistics - Other features of ESS</TITLE>
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<H1><A NAME="SEC62" HREF="ess_toc.html#TOC62">Other features of ESS</A></H1>
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ESS has a few miscellaneous features, which didn't fit anywhere else.
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<LI><A HREF="ess_10.html#SEC63">Highlighting</A>: Syntactic highlighting of buffers
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<LI><A HREF="ess_10.html#SEC64">Graphics</A>: Using graphics with ESS
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<LI><A HREF="ess_10.html#SEC67">Object Completion</A>
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<H2><A NAME="SEC63" HREF="ess_toc.html#TOC63">Syntactic highlighting of buffers</A></H2>
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ESS provides Font-Lock (see section `Using Multiple Typefaces' in <CITE>The Gnu Emacs Reference Manual</CITE>) patterns for Inferior <B>S</B> Mode, S
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Mode, and <B>S</B> Transcript Mode buffers.
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To activate the highlighting, you need to turn on Font Lock mode in the
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appropriate buffers. This can be done on a per-buffer basis with
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<KBD>M-x font-lock-mode</KBD>, or may be done by adding
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<CODE>turn-on-font-lock</CODE> to <CODE>inferior-ess-mode-hook</CODE>,
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<CODE>ess-mode-hook</CODE> and <CODE>ess-transcript-mode-hook</CODE>
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(see section <A HREF="ess_12.html#SEC78">Customizing ESS with hooks</A>). Your systems administrator may have done this for you
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in <TT>`ess-site.el'</TT> (see section <A HREF="ess_12.html#SEC72">Customizing ESS</A>).
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The font-lock patterns are defined in three variables, which you may
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<DT><U>Variable:</U> <B>ess-inf-font-lock-keywords</B>
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<DD><A NAME="IDX213"></A>
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Font-lock patterns for Inferior <B>ESS</B> Mode. The default value
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highlights prompts, inputs, assignments, output messages, vector and
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matrix labels, and literals such as <SAMP>`NA'</SAMP> and <CODE>TRUE</CODE>.
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<DT><U>Variable:</U> <B>ESS-font-lock-keywords</B>
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<DD><A NAME="IDX214"></A>
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Font-lock patterns for <B>ESS</B> programming mode. The default value
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highlights function names, literals, assignments, source functions and
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<DT><U>Variable:</U> <B>ess-trans-font-lock-keywords</B>
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<DD><A NAME="IDX215"></A>
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Font-lock patterns for <B>ESS</B> Transcript Mode. The default value
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highlights the same stuff as in Inferior <B>ESS</B> Mode.
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<H2><A NAME="SEC64" HREF="ess_toc.html#TOC64">Using graphics with ESS</A></H2>
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One of the main features of the <CODE>S</CODE> package is its ability to
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generate high-resolution graphics plots, and ESS provides a number of
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features for dealing with such plots.
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<LI><A HREF="ess_10.html#SEC65">printer</A>: The printer() graphics driver
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<LI><A HREF="ess_10.html#SEC66">X11</A>: The X11() (and other X-windows based) driver
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<H3><A NAME="SEC65" HREF="ess_toc.html#TOC65">Using ESS with the <CODE>printer()</CODE> driver</A></H3>
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This is the simplest (and least desirable) method of using graphics
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within ESS. S's <CODE>printer()</CODE> device driver produces crude character
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based plots which can be contained within the <B>ESS</B> process buffer
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itself. To start using character graphics, issue the <B>S</B> command
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<A NAME="IDX217"></A>
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(the <CODE>width=79</CODE> argument prevents Emacs line-wrapping at column
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80 on an 80-column terminal. Use a different value for a terminal with
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a different number of columns.) Plotting commands do not generate
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graphics immediately, but are stored until the <CODE>show()</CODE> command
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is issued, which displays the current figure.
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<H3><A NAME="SEC66" HREF="ess_toc.html#TOC66">Using ESS with windowing devices</A></H3>
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<A NAME="IDX218"></A>
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Of course, the ideal way to use graphics with ESS is to use a windowing
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system. Under X windows, this requires that the DISPLAY environment
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variable be appropriately set, which may not always be the case within
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your Emacs process. ESS provides a facility for setting the value of
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DISPLAY before the <B>ESS</B> process is started if the variable
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<CODE>ess-ask-about-display</CODE>
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<A NAME="IDX219"></A>
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is non-<CODE>nil</CODE>. See section <A HREF="ess_12.html#SEC72">Customizing ESS</A>, for details of this variable,
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and see section <A HREF="ess_3.html#SEC12">Starting the <B>ESS</B> process</A> for information on how to set the value of
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DISPLAY when beginning an <B>S</B> session.
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<H2><A NAME="SEC67" HREF="ess_toc.html#TOC67">Object Completion</A></H2>
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If you are running S-PLUS or R, you might consider installing the
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database files. From within (X)Emacs, "C-x d" to the directory
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(get S-PLUS running. once you have reached the SPLUS 3.x prompt, do:)
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<CODE>M-x ess-create-object-name-db</CODE>
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(this will create the file: ess-s+3-namedb.el; if it isn't in the ESS
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directory, move it there).
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Then, completions will be autoloaded and will not be regenerated for
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(get R running. once you have reached the R prompt, do:)
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<CODE>M-x ess-create-object-name-db</CODE>
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(this will create the file: ess-r-namedb.el; if it isn't in the ESS
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directory, move it there).
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