The ? key (
calc-help) displays a series of brief help messages.
Some keys (such as b and d) are prefix keys, like Emacs’s
ESC and C-x prefixes. You can type
? after a prefix to see a list of commands beginning with that
prefix. (If the message includes ‘[MORE]’, press ? again
to see additional commands for that prefix.)
The h h (
calc-full-help) command displays all the ?
responses at once. When printed, this makes a nice, compact (three pages)
summary of Calc keystrokes.
In general, the h key prefix introduces various commands that provide help within Calc. Many of the h key functions are Calc-specific analogues to the C-h functions for Emacs help.
The h i (
calc-info) command runs the Emacs Info system
to read this manual on-line. This is basically the same as typing
C-h i (the regular way to run the Info system), then, if Info
is not already in the Calc manual, selecting the beginning of the
manual. The C-x * i command is another way to read the Calc
manual; it is different from h i in that it works any time,
not just inside Calc. The plain i key is also equivalent to
h i, though this key is obsolete and may be replaced with a
different command in a future version of Calc.
The h t (
calc-tutorial) command runs the Info system on
the Tutorial section of the Calc manual. It is like h i,
except that it selects the starting node of the tutorial rather
than the beginning of the whole manual. (It actually selects the
node “Interactive Tutorial” which tells a few things about
using the Info system before going on to the actual tutorial.)
The C-x * t key is equivalent to h t (but it works at
The h s (
calc-info-summary) command runs the Info system
on the Summary node of the Calc manual. See Summary. The C-x * s
key is equivalent to h s.
The h k (
calc-describe-key) command looks up a key
sequence in the Calc manual. For example, h k H a S looks
up the documentation on the H a S (
command. This works by looking up the textual description of
the key(s) in the Key Index of the manual, then jumping to the
node indicated by the index.
Most Calc commands do not have traditional Emacs documentation
strings, since the h k command is both more convenient and
more instructive. This means the regular Emacs C-h k
describe-key) command will not be useful for Calc keystrokes.
The h c (
calc-describe-key-briefly) command reads a
key sequence and displays a brief one-line description of it at
the bottom of the screen. It looks for the key sequence in the
Summary node of the Calc manual; if it doesn’t find the sequence
there, it acts just like its regular Emacs counterpart C-h c
describe-key-briefly). For example, h c H a S
gives the description:
H a S runs calc-solve-for: a `H a S' v => fsolve(a,v) (?=notes)
which means the command H a S or H M-x calc-solve-for
takes a value ‘a’ from the stack, prompts for a value ‘v’,
then applies the algebraic function
fsolve to these values.
The ‘?=notes’ message means you can now type ? to see
additional notes from the summary that apply to this command.
The h f (
calc-describe-function) command looks up an
algebraic function or a command name in the Calc manual. Enter an
algebraic function name to look up that function in the Function
Index or enter a command name beginning with ‘calc-’ to look it
up in the Command Index. This command will also look up operator
symbols that can appear in algebraic formulas, like ‘%’ and
The h v (
calc-describe-variable) command looks up a
variable in the Calc manual. Enter a variable name like
The h b (
calc-describe-bindings) command is just like
C-h b, except that only local (Calc-related) key bindings are
The h n or h C-n (
calc-view-news) command displays
the “news” or change history of Emacs, and jumps to the most recent
portion concerning Calc (if present). For older history, see the file
etc/CALC-NEWS in the Emacs distribution.
The h C-c, h C-d, and h C-w keys display copying, distribution, and warranty information about Calc. These work by pulling up the appropriate parts of the “Copying” or “Reporting Bugs” sections of the manual.