\input texinfo @c -*-texinfo-*-
@comment %**start of header (This is for running Texinfo on a region.)
@c smallbook
-@setfilename ../../info/calc
+@setfilename ../../info/calc.info
@c [title]
@settitle GNU Emacs Calc Manual
+@documentencoding UTF-8
@setchapternewpage odd
@comment %**end of header (This is for running Texinfo on a region.)
GNU Emacs @value{EMACSVER}.
@end ifnotinfo
-Copyright @copyright{} 1990--1991, 2001--2013 Free Software Foundation, Inc.
+Copyright @copyright{} 1990--1991, 2001--2014 Free Software Foundation, Inc.
@quotation
Permission is granted to copy, distribute and/or modify this document
under the terms of the GNU Free Documentation License, Version 1.3 or
any later version published by the Free Software Foundation; with the
Invariant Sections being just ``GNU GENERAL PUBLIC LICENSE'', with the
-Front-Cover texts being ``A GNU Manual,'' and with the Back-Cover
+Front-Cover Texts being ``A GNU Manual,'' and with the Back-Cover
Texts as in (a) below. A copy of the license is included in the section
entitled ``GNU Free Documentation License.''
@c [begin]
@ifnottex
@node Top, Getting Started, (dir), (dir)
-@chapter The GNU Emacs Calculator
+@top The GNU Emacs Calculator
@noindent
@dfn{Calc} is an advanced desk calculator and mathematical tool
@ifinfo
(If you are reading this tutorial on-line while running Calc, typing
@kbd{g a} may cause the tutorial to disappear from its window and be
-replaced by a buffer named @samp{*Gnuplot Commands*}. The tutorial
+replaced by a buffer named @file{*Gnuplot Commands*}. The tutorial
will reappear when you terminate GNUPLOT by typing @kbd{g q}.)
@end ifinfo
@cindex Starting the Calculator
@cindex Running the Calculator
To start the Calculator in its standard interface, type @kbd{M-x calc}.
-By default this creates a pair of small windows, @samp{*Calculator*}
-and @samp{*Calc Trail*}. The former displays the contents of the
+By default this creates a pair of small windows, @file{*Calculator*}
+and @file{*Calc Trail*}. The former displays the contents of the
Calculator stack and is manipulated exclusively through Calc commands.
It is possible (though not usually necessary) to create several Calc
mode buffers each of which has an independent stack, undo list, and
list of the results of all calculations that have been done. The
Calc Trail buffer uses a variant of Calc mode, so Calculator commands
still work when the trail buffer's window is selected. It is possible
-to turn the trail window off, but the @samp{*Calc Trail*} buffer itself
+to turn the trail window off, but the @file{*Calc Trail*} buffer itself
still exists and is updated silently. @xref{Trail Commands}.
@kindex C-x * c
@samp{$} as the formula.
If this is the first time you have used the Calculator in this Emacs
-session, the @kbd{C-x * q} command will create the @code{*Calculator*}
+session, the @kbd{C-x * q} command will create the @file{*Calculator*}
buffer and perform all the usual initializations; it simply will
refrain from putting that buffer up in a new window. The Quick
-Calculator refers to the @code{*Calculator*} buffer for all mode
+Calculator refers to the @file{*Calculator*} buffer for all mode
settings. Thus, for example, to set the precision that the Quick
Calculator uses, simply run the full Calculator momentarily and use
the regular @kbd{p} command.
@pindex another-calc
It is possible to have any number of Calc mode buffers at once.
Usually this is done by executing @kbd{M-x another-calc}, which
-is similar to @kbd{C-x * c} except that if a @samp{*Calculator*}
+is similar to @kbd{C-x * c} except that if a @file{*Calculator*}
buffer already exists, a new, independent one with a name of the
-form @samp{*Calculator*<@var{n}>} is created. You can also use the
+form @file{*Calculator*<@var{n}>} is created. You can also use the
command @code{calc-mode} to put any buffer into Calculator mode, but
this would ordinarily never be done.
Calculator buffer is created. The @code{calc-quit} command saves
the stack and mode settings of the buffer being quit as the new defaults.
-There is only one trail buffer, @samp{*Calc Trail*}, used by all
+There is only one trail buffer, @file{*Calc Trail*}, used by all
Calculator buffers.
@node Troubleshooting Commands, , Multiple Calculators, Introduction
leaving the first, third, fourth, and so on; @kbd{M-3 M-@key{DEL}} deletes
the third stack element.
+The above commands do not depend on the location of the cursor.
+If the customizable variable @code{calc-context-sensitive-enter} is
+non-@code{nil} (@pxref{Customizing Calc}), these commands will become
+context sensitive. For example, instead of duplicating the top of the stack,
+@key{RET} will copy the element at the cursor to the top of the
+stack. With a positive numeric prefix, a copy of the element at the
+cursor and the appropriate number of preceding elements will be placed
+at the top of the stack. A negative prefix will still duplicate the
+specified element of the stack regardless of the cursor position.
+Similarly, @key{DEL} will remove the corresponding elements from the
+stack.
+
@kindex @key{TAB}
@pindex calc-roll-down
To exchange the top two elements of the stack, press @key{TAB}
@pindex calc-edit-finish
@cindex Editing the stack with Emacs
The @kbd{`} (@code{calc-edit}) command creates a temporary buffer
-(@samp{*Calc Edit*}) for editing the top-of-stack value using regular
+(@file{*Calc Edit*}) for editing the top-of-stack value using regular
Emacs commands. Note that @kbd{`} is a backquote, not a quote. With a
numeric prefix argument, it edits the specified number of stack entries
at once. (An argument of zero edits the entire stack; a negative
might want to insert new lines into the editing buffer.
When you finish editing, the Calculator parses the lines of text in
-the @samp{*Calc Edit*} buffer as numbers or formulas, replaces the
+the @file{*Calc Edit*} buffer as numbers or formulas, replaces the
original stack elements in the original buffer with these new values,
-then kills the @samp{*Calc Edit*} buffer. The original Calculator buffer
+then kills the @file{*Calc Edit*} buffer. The original Calculator buffer
continues to exist during editing, but for best results you should be
careful not to change it until you have finished the edit. You can
also cancel the edit by killing the buffer with @kbd{C-x k}.
finish, Calc will put the result on the stack without evaluating it.
If you give a prefix argument to @kbd{C-c C-c},
-Calc will not kill the @samp{*Calc Edit*} buffer. You can switch
+Calc will not kill the @file{*Calc Edit*} buffer. You can switch
back to that buffer and continue editing if you wish. However, you
should understand that if you initiated the edit with @kbd{`}, the
@kbd{C-c C-c} operation will be programmed to replace the top of the
(@code{calc-edit-variable}; @pxref{Operations on Variables}).
If the @code{calc-edit} command involves more than one stack entry,
-each line of the @samp{*Calc Edit*} buffer is interpreted as a
+each line of the @file{*Calc Edit*} buffer is interpreted as a
separate formula. Otherwise, the entire buffer is interpreted as
one formula, with line breaks ignored. (You can use @kbd{C-o} or
@kbd{C-q C-j} to insert a newline in the buffer without pressing @key{RET}.)
The @kbd{`} key also works during numeric or algebraic entry. The
-text entered so far is moved to the @code{*Calc Edit*} buffer for
+text entered so far is moved to the @file{*Calc Edit*} buffer for
more extensive editing than is convenient in the minibuffer.
@node Trail Commands, Keep Arguments, Editing Stack Entries, Stack and Trail
a different table of operators. Hexadecimal numbers are entered and
displayed with a preceding dollar sign. (Thus the regular meaning of
@kbd{$2} during algebraic entry does not work in Pascal mode, though
-@kbd{$} (and @kbd{$$}, etc.) not followed by digits works the same as
+@kbd{$} (and @kbd{$$}, etc.)@: not followed by digits works the same as
always.) No special provisions are made for other non-decimal numbers,
vectors, and so on, since there is no universally accepted standard way
of handling these in Pascal.
$$ a_{i+1} = { a_i + b_i \over 2 } , \qquad b_{i+1} = \sqrt{a_i b_i} $$
@end tex
-@cindex Root-mean-square
-Another commonly used mean, the RMS (root-mean-square), can be computed
-for a vector of numbers simply by using the @kbd{A} command.
+@c @cindex Root-mean-square
+@c Another commonly used mean, the RMS (root-mean-square), can be computed
+@c for a vector of numbers simply by using the @kbd{A} command.
@kindex u S
@pindex calc-vector-sdev
@noindent
Every character not part of the sub-formula @samp{b} has been changed
to a dot. (If the customizable variable
-@code{calc-highlight-selections-with-faces} is non-nil, then the characters
+@code{calc-highlight-selections-with-faces} is non-@code{nil}, then the characters
not part of the sub-formula are de-emphasized by using a less
noticeable face instead of using dots. @pxref{Displaying Selections}.)
The @samp{*} next to the line number is to remind you that
@end group
@end smallexample
If the customizable variable
-@code{calc-highlight-selections-with-faces} is non-nil, then the
+@code{calc-highlight-selections-with-faces} is non-@code{nil}, then the
non-selected portion of the formula will be de-emphasized by using a
less noticeable face (@code{calc-nonselected-face}) instead of dots
and the selected sub-formula will be highlighted by using a more
will be unable to integrate a function it could otherwise handle. Raising
this limit allows the Calculator to solve more integrals, though the time
it takes may grow exponentially. You can monitor the integrator's actions
-by creating an Emacs buffer called @code{*Trace*}. If such a buffer
+by creating an Emacs buffer called @file{*Trace*}. If such a buffer
exists, the @kbd{a i} command will write a log of its actions there.
If you want to manipulate integrals in a purely symbolic way, you can
@subsection Debugging Rewrites
@noindent
-If a buffer named @samp{*Trace*} exists, the rewrite mechanism will
+If a buffer named @file{*Trace*} exists, the rewrite mechanism will
record some useful information there as it operates. The original
formula is written there, as is the result of each successful rewrite,
and the final result of the rewriting. All phase changes are also
noted.
-Calc always appends to @samp{*Trace*}. You must empty this buffer
+Calc always appends to @file{*Trace*}. You must empty this buffer
yourself periodically if it is in danger of growing unwieldy.
Note that the rewriting mechanism is substantially slower when the
-@samp{*Trace*} buffer exists, even if the buffer is not visible on
+@file{*Trace*} buffer exists, even if the buffer is not visible on
the screen. Once you are done, you will probably want to kill this
buffer (with @kbd{C-x k *Trace* @key{RET}}). If you leave it in
existence and forget about it, all your future rewrite commands will
If the units you request are inconsistent with the original units, the
number will be converted into your units times whatever ``remainder''
-units are left over. For example, converting @samp{55 mph} into acres
+units are left over. (This can be disabled; @pxref{Customizing Calc}.)
+For example, converting @samp{55 mph} into acres
produces @samp{6.08e-3 acre / m s}. (Recall that multiplication binds
more strongly than division in Calc formulas, so the units here are
acres per meter-second.) Remainder units are expressed in terms of
``fundamental'' units like @samp{m} and @samp{s}, regardless of the
input units.
-If you want to disallow using inconsistent units, you can set the customizable variable
-@code{calc-ensure-consistent-units} to @code{t} (@pxref{Customizing Calc}). In this case,
-if you request units which are inconsistent with the original units, you will be warned about
-it and no conversion will occur.
-
One special exception is that if you specify a single unit name, and
a compatible unit appears somewhere in the units expression, then
that compatible unit will be converted to the new unit and the
If the value on the stack does not contain any units, @kbd{u c} will
prompt first for the old units which this value should be considered
-to have, then for the new units. Assuming the old and new units you
-give are consistent with each other, the result also will not contain
-any units. For example, @kbd{@w{u c} cm @key{RET} in @key{RET}}
-converts the number 2 on the stack to 5.08.
+to have, then for the new units. (If the value on the stack can be
+simplified so that it doesn't contain any units, like @samp{ft/in} can
+be simplified to 12, then @kbd{u c} will still prompt for both old
+units and new units. Assuming the old and new units you give are
+consistent with each other, the result also will not contain any
+units. For example, @kbd{@w{u c} cm @key{RET} in @key{RET}} converts
+the number 2 on the stack to 5.08.
@kindex u b
@pindex calc-base-units
@kindex u v
@pindex calc-enter-units-table
The @kbd{u v} (@code{calc-enter-units-table}) command displays the units table
-in another buffer called @code{*Units Table*}. Each entry in this table
+in another buffer called @file{*Units Table*}. Each entry in this table
gives the unit name as it would appear in an expression, the definition
of the unit in terms of simpler units, and a full name or description of
the unit. Fundamental units are defined as themselves; these are the
based on a fundamental physical process (although there are efforts to
change this) is the kilogram, which was originally defined as the mass
of one liter of water, but is now defined as the mass of the
-International Prototype Kilogram (IPK), a cylinder of platinum-iridium
-kept at the Bureau International des Poids et Mesures in S@`evres,
+international prototype of the kilogram (IPK), a cylinder of platinum-iridium
+kept at the Bureau international des poids et mesures in S@`evres,
France. (There are several copies of the IPK throughout the world.)
The British imperial units, once defined in terms of physical objects,
were redefined in 1963 in terms of SI units. The US customary units,
is the height of the point
at coordinate @expr{(x_i, y_j)} on the surface. The 3D graph will
be displayed from a certain default viewpoint; you can change this
-viewpoint by adding a @samp{set view} to the @samp{*Gnuplot Commands*}
+viewpoint by adding a @samp{set view} to the @file{*Gnuplot Commands*}
buffer as described later. See the GNUPLOT documentation for a
description of the @samp{set view} command.
on the same axes.
The @kbd{g a} command (and many others that affect the current graph)
-will cause a special buffer, @samp{*Gnuplot Commands*}, to be displayed
+will cause a special buffer, @file{*Gnuplot Commands*}, to be displayed
in another window. This buffer is a template of the commands that will
be sent to GNUPLOT when it is time to draw the graph. The first
@kbd{g a} command adds a @code{plot} command to this buffer. Succeeding
must be only one @code{plot} command, and it must be the last command
in the buffer. If you want to save and later restore a complete graph
configuration, you can use regular Emacs commands to save and restore
-the contents of the @samp{*Gnuplot Commands*} buffer.
+the contents of the @file{*Gnuplot Commands*} buffer.
@vindex PlotData1
@vindex PlotData2
but the ``z'' entry is a vector of curve values. With a negative
prefix @expr{-n}, it takes @expr{n} vectors of the form @expr{[x, y, z]}.
The @kbd{g A} command works by adding a @code{splot} (surface-plot)
-command to the @samp{*Gnuplot Commands*} buffer.
+command to the @file{*Gnuplot Commands*} buffer.
(Although @kbd{g a} adds a 2D @code{plot} command to the
-@samp{*Gnuplot Commands*} buffer, Calc changes this to @code{splot}
+@file{*Gnuplot Commands*} buffer, Calc changes this to @code{splot}
before sending it to GNUPLOT if it notices that the data points are
evaluating to @code{xyz} calls. It will not work to mix 2D and 3D
@kbd{g a} curves in a single graph, although Calc does not currently
@kindex g p
@pindex calc-graph-plot
The @kbd{g p} (@code{calc-graph-plot}) command uses GNUPLOT to draw
-the graph described in the @samp{*Gnuplot Commands*} buffer. Any
+the graph described in the @file{*Gnuplot Commands*} buffer. Any
GNUPLOT parameters which are not defined by commands in this buffer
are reset to their default values. The variables named in the @code{plot}
command are written to a temporary data file and the variable names
The @kbd{g P} (@code{calc-graph-print}) command is like @kbd{g p},
except that it sends the output to a printer instead of to the
screen. More precisely, @kbd{g p} looks for @samp{set terminal}
-or @samp{set output} commands in the @samp{*Gnuplot Commands*} buffer;
+or @samp{set output} commands in the @file{*Gnuplot Commands*} buffer;
lacking these it uses the default settings. However, @kbd{g P}
ignores @samp{set terminal} and @samp{set output} commands and
uses a different set of default values. All of these values are
on and off. It is off by default; tick marks appear only at the
edges of the graph. With the grid turned on, dotted lines appear
across the graph at each tick mark. Note that this command only
-changes the setting in @samp{*Gnuplot Commands*}; to see the effects
+changes the setting in @file{*Gnuplot Commands*}; to see the effects
of the change you must give another @kbd{g p} command.
@kindex g b
it will not be. For example, plotting @expr{1 + x} with @expr{x} in the
interval @samp{[0 ..@: 1e-6]} will round all the data points down
to 1.0! Putting the command @samp{set precision @var{n}} in the
-@samp{*Gnuplot Commands*} buffer will cause the data to be computed
+@file{*Gnuplot Commands*} buffer will cause the data to be computed
at precision @var{n} instead of 5. Since this is such a rare case,
there is no keystroke-based command to set the precision.
The @kbd{g n} (@code{calc-graph-name}) command sets the title of an
individual curve. Like the other curve-manipulating commands, it
affects the most recently added curve, i.e., the last curve on the
-list in the @samp{*Gnuplot Commands*} buffer. To set the title of
+list in the @file{*Gnuplot Commands*} buffer. To set the title of
the other curves you must first juggle them to the end of the list
-with @kbd{g j}, or edit the @samp{*Gnuplot Commands*} buffer by hand.
+with @kbd{g j}, or edit the @file{*Gnuplot Commands*} buffer by hand.
Curve titles appear in the key; if the key is turned off they are
not used.
and ``y'' axes, respectively. These titles appear next to the
tick marks on the left and bottom edges of the graph, respectively.
Calc does not have commands to control the tick marks themselves,
-but you can edit them into the @samp{*Gnuplot Commands*} buffer if
+but you can edit them into the @file{*Gnuplot Commands*} buffer if
you wish. See the GNUPLOT documentation for details.
@kindex g r
The @code{dumb} device is an interface to ``dumb terminals,'' i.e.,
terminals with no special graphics facilities. It writes a crude
picture of the graph composed of characters like @code{-} and @code{|}
-to a buffer called @samp{*Gnuplot Trail*}, which Calc then displays.
+to a buffer called @file{*Gnuplot Trail*}, which Calc then displays.
The graph is made the same size as the Emacs screen, which on most
dumb terminals will be
@texline @math{80\times24}
characters. Also, the device name @code{big} is like @code{dumb}
but creates a graph four times the width and height of the Emacs
screen. You will then have to scroll around to view the entire
-graph. In the @samp{*Gnuplot Trail*} buffer, @key{SPC}, @key{DEL},
+graph. In the @file{*Gnuplot Trail*} buffer, @key{SPC}, @key{DEL},
@kbd{<}, and @kbd{>} are defined to scroll by one screenful in each
of the four directions.
@code{postscript}; in these cases the output in the desired format
goes into the file you name with @kbd{g O}. Type @kbd{g O stdout
@key{RET}} to set GNUPLOT to write to its standard output stream,
-i.e., to @samp{*Gnuplot Trail*}. This is the default setting.
+i.e., to @file{*Gnuplot Trail*}. This is the default setting.
Another special output name is @code{tty}, which means that GNUPLOT
is going to write graphics commands directly to its standard output,
default number of data points (see @kbd{g N}) and the X geometry
(see @kbd{g X}) are also saved. Other graph information is @emph{not}
saved; you can save a graph's configuration simply by saving the contents
-of the @samp{*Gnuplot Commands*} buffer.
+of the @file{*Gnuplot Commands*} buffer.
@vindex calc-gnuplot-plot-command
@vindex calc-gnuplot-default-device
window in the upper-left corner of the screen. This command has no
effect if the current device is @code{windows}.
-The buffer called @samp{*Gnuplot Trail*} holds a transcript of the
+The buffer called @file{*Gnuplot Trail*} holds a transcript of the
session with GNUPLOT@. This shows the commands Calc has ``typed'' to
GNUPLOT and the responses it has received. Calc tries to notice when an
error message has appeared here and display the buffer for you when
@pindex calc-graph-command
The @kbd{g C} (@code{calc-graph-command}) command prompts you to
enter any line of text, then simply sends that line to the current
-GNUPLOT process. The @samp{*Gnuplot Trail*} buffer looks deceptively
+GNUPLOT process. The @file{*Gnuplot Trail*} buffer looks deceptively
like a Shell buffer but you can't type commands in it yourself.
Instead, you must use @kbd{g C} for this purpose.
@pindex calc-graph-view-commands
@pindex calc-graph-view-trail
The @kbd{g v} (@code{calc-graph-view-commands}) and @kbd{g V}
-(@code{calc-graph-view-trail}) commands display the @samp{*Gnuplot Commands*}
-and @samp{*Gnuplot Trail*} buffers, respectively, in another window.
+(@code{calc-graph-view-trail}) commands display the @file{*Gnuplot Commands*}
+and @file{*Gnuplot Trail*} buffers, respectively, in another window.
This happens automatically when Calc thinks there is something you
will want to see in either of these buffers. If you type @kbd{g v}
or @kbd{g V} when the relevant buffer is already displayed, the
-buffer is hidden again. (Note that on MS-Windows, the @samp{*Gnuplot
+buffer is hidden again. (Note that on MS-Windows, the @file{*Gnuplot
Trail*} buffer will usually show nothing of interest, because
GNUPLOT's responses are not communicated back to Calc.)
One reason to use @kbd{g v} is to add your own commands to the
-@samp{*Gnuplot Commands*} buffer. Press @kbd{g v}, then use
+@file{*Gnuplot Commands*} buffer. Press @kbd{g v}, then use
@kbd{C-x o} to switch into that window. For example, GNUPLOT has
@samp{set label} and @samp{set arrow} commands that allow you to
annotate your plots. Since Calc doesn't understand these commands,
-you have to add them to the @samp{*Gnuplot Commands*} buffer
+you have to add them to the @file{*Gnuplot Commands*} buffer
yourself, then use @w{@kbd{g p}} to replot using these new commands. Note
that your commands must appear @emph{before} the @code{plot} command.
To get help on any GNUPLOT feature, type, e.g., @kbd{g C help set label}.
@kindex g K
@pindex calc-graph-kill
The @kbd{g K} (@code{calc-graph-kill}) command is like @kbd{g q}
-except that it also views the @samp{*Gnuplot Trail*} buffer so that
+except that it also views the @file{*Gnuplot Trail*} buffer so that
you can see the process being killed. This is better if you are
killing GNUPLOT because you think it has gotten stuck.
Calc standalone (@pxref{Standalone Operation}).
If you aren't using the X window system, you must switch into
-the @samp{*Calc Keypad*} window, place the cursor on the desired
+the @file{*Calc Keypad*} window, place the cursor on the desired
``key,'' and type @key{SPC} or @key{RET}. If you think this
is easier than using Calc normally, go right ahead.
The properties of @code{calc-define} are evaluated in the same order
that they were added. They can assume that the Calc modules @file{calc.el},
@file{calc-ext.el}, and @file{calc-macs.el} have been fully loaded, and
-that the @samp{*Calculator*} buffer will be the current buffer.
+that the @file{*Calculator*} buffer will be the current buffer.
If your @code{calc-define} property only defines algebraic functions,
you can be sure that it will have been evaluated before Calc tries to
@end smallexample
@findex calc-select-buffer
-The @code{calc-select-buffer} function selects the @samp{*Calculator*}
+The @code{calc-select-buffer} function selects the @file{*Calculator*}
buffer if necessary, say, because the command was invoked from inside
-the @samp{*Calc Trail*} window.
+the @file{*Calc Trail*} window.
@findex calc-set-command-flag
You can call, for example, @code{(calc-set-command-flag 'no-align)} to
and @code{calc-keep-args-flag} at the end of this command.
@item do-edit
-Switch to buffer @samp{*Calc Edit*} after this command.
+Switch to buffer @file{*Calc Edit*} after this command.
@item hold-trail
Do not move trail pointer to end of trail when something is recorded
found it when you are done, unless the user of your program is
actually expecting it to affect the stack.
-Note that you do not actually have to switch into the @samp{*Calculator*}
+Note that you do not actually have to switch into the @file{*Calculator*}
buffer in order to use @code{calc-eval}; it temporarily switches into
the stack buffer if necessary.
which is not a Lisp list.
Large integers are stored as lists of the form @samp{(bigpos @var{d0}
-@var{d1} @var{d2} @dots{})} for positive integers 1000000 or more, or
-@samp{(bigneg @var{d0} @var{d1} @var{d2} @dots{})} for negative integers
-@mathit{-1000000} or less. Each @var{d} is a base-1000 ``digit,'' a Lisp integer
-from 0 to 999. The least significant digit is @var{d0}; the last digit,
+@var{d1} @var{d2} @dots{})} for sufficiently large positive integers
+(where ``sufficiently large'' depends on the machine), or
+@samp{(bigneg @var{d0} @var{d1} @var{d2} @dots{})} for negative
+integers. Each @var{d} is a base-@expr{10^n} ``digit'' (where again,
+@expr{n} depends on the machine), a Lisp integer from 0 to
+99@dots{}9. The least significant digit is @var{d0}; the last digit,
@var{dn}, which is always nonzero, is the most significant digit. For
-example, the integer @mathit{-12345678} is stored as @samp{(bigneg 678 345 12)}.
+example, the integer @mathit{-12345678} might be stored as
+@samp{(bigneg 678 345 12)}.
The distinction between small and large integers is entirely hidden from
the user. In @code{defmath} definitions, the Lisp predicate @code{integerp}
@end defun
@defun calc-refresh
-Erase the @code{*Calculator*} buffer and reformat its contents from memory.
+Erase the @file{*Calculator*} buffer and reformat its contents from memory.
This must be called after changing any parameter, such as the current
display radix, which might change the appearance of existing stack
entries. (During a keyboard macro invoked by the @kbd{X} key, refreshing
is @code{nil}.
@end defvar
+@defvar calc-context-sensitive-enter
+The commands @code{calc-enter} and @code{calc-pop} will typically
+duplicate the top of the stack. If
+@code{calc-context-sensitive-enter} is non-@code{nil}, then the
+@code{calc-enter} will copy the element at the cursor to the
+top of the stack and @code{calc-pop} will delete the element at the
+cursor. The default value of @code{calc-context-sensitive-enter} is
+@code{nil}.
+@end defvar
+
@defvar calc-undo-length
The variable @code{calc-undo-length} determines the number of undo
steps that Calc will keep track of when @code{calc-quit} is called.
HCoop / bpt / emacs.git / blobdiff