calc: Language Modes
7.8 Language Modes
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The commands in this section change Calc to use a different notation for
entry and display of formulas, corresponding to the conventions of some
other common language such as Pascal or LaTeX. Objects displayed on the
stack or yanked from the Calculator to an editing buffer will be
formatted in the current language; objects entered in algebraic entry or
yanked from another buffer will be interpreted according to the current
language.
The current language has no effect on things written to or read from
the trail buffer, nor does it affect numeric entry. Only algebraic
entry is affected. You can make even algebraic entry ignore the current
language and use the standard notation by giving a numeric prefix, e.g.,
‘C-u '’.
For example, suppose the formula ‘2*a[1] + atan(a[2])’ occurs in a C
program; elsewhere in the program you need the derivatives of this
formula with respect to ‘a[1]’ and ‘a[2]’. First, type ‘d C’ to switch
to C notation. Now use ‘C-u C-x * g’ to grab the formula into the
Calculator, ‘a d a[1] <RET>’ to differentiate with respect to the first
variable, and ‘C-x * y’ to yank the formula for the derivative back into
your C program. Press ‘U’ to undo the differentiation and repeat with
‘a d a[2] <RET>’ for the other derivative.
Without being switched into C mode first, Calc would have
misinterpreted the brackets in ‘a[1]’ and ‘a[2]’, would not have known
that ‘atan’ was equivalent to Calc’s built-in ‘arctan’ function, and
would have written the formula back with notations (like implicit
multiplication) which would not have been valid for a C program.
As another example, suppose you are maintaining a C program and a
LaTeX document, each of which needs a copy of the same formula. You can
grab the formula from the program in C mode, switch to LaTeX mode, and
yank the formula into the document in LaTeX math-mode format.
Language modes are selected by typing the letter ‘d’ followed by a
shifted letter key.
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calc: Display Modes
calc: Mode Settings
calc: Modes Variable