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The m g (calcgetmodes
) command pushes onto the stack
a vector of numbers that describes the various mode settings that
are in effect. With a numeric prefix argument, it pushes only the
nth mode, i.e., the nth element of this vector. Keyboard
macros can use the m g command to modify their behavior based
on the current mode settings.
The modes vector is also available in the special variable
Modes
. In other words, m g is like s r Modes RET.
It will not work to store into this variable; in fact, if you do,
Modes
will cease to track the current modes. (The m g
command will continue to work, however.)
In general, each number in this vector is suitable as a numeric
prefix argument to the associated modesetting command. (Recall
that the ~ key takes a number from the stack and gives it as
a numeric prefix to the next command.)
The elements of the modes vector are as follows:

Current precision. Default is 12; associated command is p.

Binary word size. Default is 32; associated command is b w.

Stack size (not counting the value about to be pushed by m g).
This is zero if m g is executed with an empty stack.

Number radix. Default is 10; command is d r.

Floatingpoint format. This is the number of digits, plus the
constant 0 for normal notation, 10000 for scientific notation,
20000 for engineering notation, or 30000 for fixedpoint notation.
These codes are acceptable as prefix arguments to the d n
command, but note that this may lose information: For example,
d s and Cu 12 d s have similar (but not quite
identical) effects if the current precision is 12, but they both
produce a code of 10012, which will be treated by d n as
Cu 12 d s. If the precision then changes, the float format
will still be frozen at 12 significant figures.

Angular mode. Default is 1 (degrees). Other values are 2 (radians)
and 3 (HMS). The m d command accepts these prefixes.

Symbolic mode. Value is 0 or 1; default is 0. Command is m s.

Fraction mode. Value is 0 or 1; default is 0. Command is m f.

Polar mode. Value is 0 (rectangular) or 1 (polar); default is 0.
Command is m p.

Matrix/scalar mode. Default value is 1. Value is 0 for scalar
mode, 2 for matrix mode, or N for @c{$N\times N$}
NxN matrix mode. Command is m v.

Simplification mode. Default is 1. Value is 1 for off (m O),
0 for m N, 2 for m B, 3 for m A, 4 for m E,
or 5 for m U. The m D command accepts these prefixes.

Infinite mode. Default is 1 (off). Value is 1 if the mode is on,
or 0 if the mode is on with positive zeros. Command is m i.
For example, the sequence M1 m g RET 2 + ~ p increases the
precision by two, leaving a copy of the old precision on the stack.
Later, ~ p will restore the original precision using that
stack value. (This sequence might be especially useful inside a
keyboard macro.)
As another example, M3 m g 1  ~ DEL deletes all but the
oldest (bottommost) stack entry.
Yet another example: The HP48 "round" command rounds a number
to the current displayed precision. You could roughly emulate this
in Calc with the sequence M5 m g 10000 % ~ c c. (This
would not work for fixedpoint mode, but it wouldn't be hard to
do a full emulation with the help of the Z [ and Z ]
programming commands. See section Conditionals in Keyboard Macros.)
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