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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
calc-eval
.
The difference from plain eval
is that calc-eval
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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