From: Emanuel Berg <incal@dataswamp.org>
To: help-gnu-emacs@gnu.org
Subject: Re: all-substance.el
Date: Thu, 11 Jul 2024 19:59:27 +0200 [thread overview]
Message-ID: <87zfqnizcw.fsf@dataswamp.org> (raw)
In-Reply-To: 87o776ko43.fsf@dataswamp.org
> Here is another interesting program, and very substantial
Added `wash-out', so now we have wash on but also wash of.
See results in particular with half time 6 hours in the below
examples for unexpected things, to most.
Also added docstrings and a bunch of stuff.
;;; -*- lexical-binding: t -*-
;;
;; this file:
;; https://dataswamp.org/~incal/emacs-init/all-substance.el
(require 'cl-lib)
(defun half-time-to-day-drop (ht)
(if (< ht 24)
(/ ht 24 2.0)
(- 1 (/ 24 ht 2.0)) ))
;; (half-time-to-day-drop 12) ; 0.25
;; (half-time-to-day-drop 48) ; 0.75
(defun all-substance (q d ht &optional verbose day-q)
"Q is the quantity, for example 10. This is a number; do not use a unit.
D is the number of days, for example 20.
HT is the half-time in hours, for example 6.
Set VERBOSE to return a string.
Set DAY-Q if Q instead is submitted the daily quantity, for example 0.5."
(cl-loop
with daily = (if day-q q (/ q d 1.0))
with day-drop = (half-time-to-day-drop ht)
for i downfrom (1- d) to 0
sum (* daily (expt day-drop i)) into total
finally return
(if verbose
(message "daily %.2f, days %d, total %.2f" daily d total)
total) ))
;; (all-substance 300 365 6) ; 0.94
;; (all-substance 0.5 30 6 nil t) ; 0.57
;; (all-substance 365 365 6 t) ; daily 1.00, days 365, total 1.14
(defun wash-out (q ht &optional days)
(or days (setq days 5))
(cl-loop
with day-drop = (half-time-to-day-drop ht)
for d from 1 to days
collect (* q (expt day-drop d)) into res
finally return res) )
;; (wash-out 1.14 6) ; 0.1 1 day w/o resupply
;; 0.02 2 ..
;; 0.002 3 ..
;; 0.0003 4 ..
;; 0.00003 5 ..
(provide 'all-substance)
--
underground experts united
https://dataswamp.org/~incal
prev parent reply other threads:[~2024-07-11 17:59 UTC|newest]
Thread overview: 2+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-07-10 1:54 all-substance.el Emanuel Berg
2024-07-11 17:59 ` Emanuel Berg [this message]
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