From: Emanuel Berg <incal@dataswamp.org>
To: help-gnu-emacs@gnu.org
Subject: Re: macro that uses local variables
Date: Tue, 08 Aug 2023 03:27:22 +0200 [thread overview]
Message-ID: <871qgenx1h.fsf@dataswamp.org> (raw)
In-Reply-To: CTRcEs5TyCZ4Mr3zGFP_ALOdBI9eRrIgavhmOzTVcPCKA-Xg6a2L3-YDZsFiaX8E0QB0kGnnzbj59f_KsIucZIG9HjsCUeBnZMYZUpVeCd0=@protonmail.com
Heime wrote:
> I am using the rocket equation in this macro [...]
>
> (defmacro booster-velocity-change
> (specific-impulse standard-gravity initial-mass final-mass)
> "Compute change of velocity using rocket equation."
> `(* (* ,specific-impulse ,standard-gravity)
> (log (mass-ratio ,initial-mass ,final-mass))) )
There is no reason to write a macro for this
simple computation.
> I want to change it such that the arguments are set as local
> variables
Lexical scope, defun, arguments, if need be `let'. It is
super easy.
If you start thinking "how do I solve my problem?" instead of
"how do I do <something> in Emacs", everything will be much
easier for you ...
--
underground experts united
https://dataswamp.org/~incal
next prev parent reply other threads:[~2023-08-08 1:27 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-08-08 0:32 macro that uses local variables Heime
2023-08-08 1:27 ` Emanuel Berg [this message]
2023-08-09 3:09 ` Heime
2023-08-09 21:02 ` Emanuel Berg
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