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Finally, if the separator symbol is
eval, then the Lisp
eval function is called on the first argument, which must
be a Lisp expression rather than a Calc formula. Remember to
quote the expression so that it is not evaluated until inside
The difference from plain
eval is that
switches to the Calc buffer before evaluating the expression.
For example, `(calc-eval '(setq calc-internal-prec 17) 'eval)'
will correctly affect the buffer-local Calc precision variable.
An alternative would be `(calc-eval '(calc-precision 17) 'eval)'.
This is evaluating a call to the function that is normally invoked
by the p key, giving it 17 as its "numeric prefix argument."
Note that this function will leave a message in the echo area as
a side effect. Also, all Calc functions switch to the Calc buffer
automatically if not invoked from there, so the above call is
also equivalent to `(calc-precision 17)' by itself.
In all cases, Calc uses
save-excursion to switch back to
your original buffer when it is done.
As usual the first argument can be a list that begins with a Lisp expression to use default instead of current mode settings.
The result of
calc-eval in this usage is just the result
returned by the evaluated Lisp expression.
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