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Re: Evaluation of "standard" style math expresssions.
From: |
Marco Parrone |
Subject: |
Re: Evaluation of "standard" style math expresssions. |
Date: |
Tue, 21 Sep 2004 12:07:56 GMT |
User-agent: |
Gnus/5.1006 (Gnus v5.10.6) Emacs/21.3 (gnu/linux) |
Alex Polite on 21 Sep 2004 11:48:13 GMT writes:
> I know how to evaluate mathematical expressions expressed in lisp in
> any emacs buffer. (eg (+ 17 42))
>
> But I'd like to be able to eval expression where the notation is the
> kind you learn in school (eg (17 + 42))
>
> How do I do it?
you can pipe the expression to bc.
for example on a line you have
1 + 2 * 3
you can set the mark `C-SPC' at the beginning of the line, then move
the point in the next line `C-n', then pipe the line to bc `M-| bc RET'
try with
9 / 2
you get 4, you may want to do this instead
scale=1
9 / 2
(set the mark at the beginning of the first line and move the point
after the second), so to get `4.5'.
for more informations about bc syntax, do `M-x man RET bc RET'.
--
Marco Parrone <marc0@autistici.org>
fingerprint: F7D4 527B DE97 4090 657B 6E4E 8B63 1167 (4507 0AD6)