* Improvements on constructing a string
@ 2022-11-10 5:38 Heime
2022-11-10 14:09 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-11-10 14:28 ` Jean Louis
0 siblings, 2 replies; 3+ messages in thread
From: Heime @ 2022-11-10 5:38 UTC (permalink / raw)
To: Heime via Users list for the GNU Emacs text editor
Can one improve on this implementation that makes a string "st".
(defun chart-row (list)
"Make row for Engine Parameters as string."
(let ( (st "") )
(while list
(setq st (concat st (chart-cell (pop list)))))
(setq st (concat st "\n"))
st))
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Improvements on constructing a string
2022-11-10 5:38 Improvements on constructing a string Heime
@ 2022-11-10 14:09 ` Stefan Monnier via Users list for the GNU Emacs text editor
2022-11-10 14:28 ` Jean Louis
1 sibling, 0 replies; 3+ messages in thread
From: Stefan Monnier via Users list for the GNU Emacs text editor @ 2022-11-10 14:09 UTC (permalink / raw)
To: help-gnu-emacs
> (let ( (st "") )
> (while list
> (setq st (concat st (chart-cell (pop list)))))
This has O(N²) complexity. Use `mapconcat` to avoid that.
> (setq st (concat st "\n"))
> st))
Aka
(concat st "\n"))
-- Stefan
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: Improvements on constructing a string
2022-11-10 5:38 Improvements on constructing a string Heime
2022-11-10 14:09 ` Stefan Monnier via Users list for the GNU Emacs text editor
@ 2022-11-10 14:28 ` Jean Louis
1 sibling, 0 replies; 3+ messages in thread
From: Jean Louis @ 2022-11-10 14:28 UTC (permalink / raw)
To: Heime; +Cc: Heime via Users list for the GNU Emacs text editor
* Heime <heimeborgia@protonmail.com> [2022-11-10 08:40]:
>
> Can one improve on this implementation that makes a string "st".
>
> (defun chart-row (list)
> "Make row for Engine Parameters as string."
>
> (let ( (st "") )
>
> (while list
> (setq st (concat st (chart-cell (pop list)))))
> (setq st (concat st "\n"))
>
> st))
Is your function `chart-cell' anyhow related to package chart? If it
is not related, I suggest renaming the function, use your own
prefixes.
And what in general are you trying to do?
M-x chart-emacs-storage
Emacs Runtime Storage Usage
221M|----------|
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B147M| | |-----------|
y | | | |
t | | | |
e | | | |
s | | | |
73M| | |-----------| | |
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| | | ||-----------| | | | |
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0----------------------------------------------------------------------------------------------------------------
symbols string-bytes vector-slots intervals
conses strings vectors floats buffers
Storage Items
--
Jean
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