calc: General Mode Commands
7.1 General Mode Commands
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You can save all of the current mode settings in your Calc init file
(the file given by the variable ‘calc-settings-file’, typically
‘~/.emacs.d/calc.el’) with the ‘m m’ (‘calc-save-modes’) command. This
will cause Emacs to reestablish these modes each time it starts up. The
modes saved in the file include everything controlled by the ‘m’ and ‘d’
prefix keys, the current precision and binary word size, whether or not
the trail is displayed, the current height of the Calc window, and more.
The current interface (used when you type ‘C-x * *’) is also saved. If
there were already saved mode settings in the file, they are replaced.
Otherwise, the new mode information is appended to the end of the file.
The ‘m R’ (‘calc-mode-record-mode’) command tells Calc to record all
the mode settings (as if by pressing ‘m m’) every time a mode setting
changes. If the modes are saved this way, then this “automatic mode
recording” mode is also saved. Type ‘m R’ again to disable this method
of recording the mode settings. To turn it off permanently, the ‘m m’
command will also be necessary. (If Embedded mode is enabled, other
options for recording the modes are available; 
Mode Settings in
Embedded Mode.)
The ‘m F’ (‘calc-settings-file-name’) command allows you to choose a
different file than the current value of ‘calc-settings-file’ for ‘m m’,
‘Z P’, and similar commands to save permanent information. You are
prompted for a file name. All Calc modes are then reset to their
default values, then settings from the file you named are loaded if this
file exists, and this file becomes the one that Calc will use in the
future for commands like ‘m m’. The default settings file name is
‘~/.emacs.d/calc.el’. You can see the current file name by giving a
blank response to the ‘m F’ prompt. See also the discussion of the
‘calc-settings-file’ variable; Customizing Calc.
If the file name you give is your user init file (typically
‘~/.emacs’), ‘m F’ will not automatically load the new file. This is
because your user init file may contain other things you don’t want to
reread. You can give a numeric prefix argument of 1 to ‘m F’ to force
it to read the file no matter what. Conversely, an argument of -1 tells
‘m F’ _not_ to read the new file. An argument of 2 or -2 tells ‘m F’
not to reset the modes to their defaults beforehand, which is useful if
you intend your new file to have a variant of the modes present in the
file you were using before.
The ‘m x’ (‘calc-always-load-extensions’) command enables a mode in
which the first use of Calc loads the entire program, including all
extensions modules. Otherwise, the extensions modules will not be
loaded until the various advanced Calc features are used. Since this
mode only has effect when Calc is first loaded, ‘m x’ is usually
followed by ‘m m’ to make the mode-setting permanent. To load all of
Calc just once, rather than always in the future, you can press ‘C-x *
L’.
The ‘m S’ (‘calc-shift-prefix’) command enables a mode in which all
of Calc’s letter prefix keys may be typed shifted as well as unshifted.
If you are typing, say, ‘a S’ (‘calc-solve-for’) quite often you might
find it easier to turn this mode on so that you can type ‘A S’ instead.
When this mode is enabled, the commands that used to be on those single
shifted letters (e.g., ‘A’ (‘calc-abs’)) can now be invoked by pressing
the shifted letter twice: ‘A A’. Note that the ‘v’ prefix key always
works both shifted and unshifted, and the ‘z’ and ‘Z’ prefix keys are
always distinct. Also, the ‘h’ prefix is not affected by this mode.
Press ‘m S’ again to disable shifted-prefix mode.
Info Catalog
calc: Mode Settings
calc: Mode Settings
calc: Precision