* Re: Can you loop in math mode?
[not found] <CAKc7PVDnSqZMpQz=8L5b+SijziN1aUYkm0C-Pv3FMSVy-mg_0Q__8285.33232431568$1566173873$gmane$org@mail.gmail.com>
@ 2019-08-19 6:20 ` Stephane Chazelas
2019-08-19 6:41 ` Sebastian Gniazdowski
0 siblings, 1 reply; 4+ messages in thread
From: Stephane Chazelas @ 2019-08-19 6:20 UTC (permalink / raw)
To: Sebastian Gniazdowski; +Cc: Zsh Users
2019-08-19 02:16:20 +0200, Sebastian Gniazdowski:
[...]
> is some kind of a looping possible in math mode?
[...]
Can you maybe be more specific as to what you're trying to do?
You can use recursion:
$ n=6 a='(n-->1 ? a*(n+1) : 1)' zsh -c 'echo $((a))'
720
(6!)
Including via math functions, but within limits.
$ n=0 a='(++n <= 255 ? a+2 : 1)' zsh -c 'echo $((a))'
zsh:1: math recursion limit exceeded: (++n <= 255 ? a+2 : 1)
And you can of course have command substitutions inside an
arithmetic expression:
$ echo $(( 1 $(for i ({2..6}) print "*$i") ))
720
--
Stephane
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Can you loop in math mode?
2019-08-19 6:20 ` Can you loop in math mode? Stephane Chazelas
@ 2019-08-19 6:41 ` Sebastian Gniazdowski
2019-08-19 6:43 ` Sebastian Gniazdowski
0 siblings, 1 reply; 4+ messages in thread
From: Sebastian Gniazdowski @ 2019-08-19 6:41 UTC (permalink / raw)
To: Sebastian Gniazdowski, Zsh Users
I'm writing a function that computes lengths of the lines in BUFFER
and builds up an array, where each element is a sum of the previous
and the current line / element.
So I have:
integer idx sum
lines_lengths=( ${lines_lengths[@]/(#m)*/$(( sum += ${#MATCH}+1 ))} )
However, I would also like to take into account screen lines, so i.e.
gradually decline ${#MATCH} by COLUMNS bit by bit, assigning a new
element also for each screen-line. Like the following function does:
.zed-compute-llen() {
len=${#1}
while (( len > COLUMNS )) {
sum+=COLUMNS
lines_lengths[++idx]=( $sum )
len=len-COLUMNS
}
sum+=len+1
lines_lengths[++idx]=( $sum )
}
So basically, I would want to do this in the // substitution, like so:
: ${lines_lengths[@]/(#m)*/$(( append(${#MATCH}) ))}
which now thus just resolved :] I don't even need the string-math
function, append should add multiple lines_lengths elements if len >
COLUMNS, that's all.
But thanks for the answer, I think I could use recursion for this too.
On Mon, 19 Aug 2019 at 08:20, Stephane Chazelas
<stephane.chazelas@gmail.com> wrote:
>
> 2019-08-19 02:16:20 +0200, Sebastian Gniazdowski:
> [...]
> > is some kind of a looping possible in math mode?
> [...]
>
> Can you maybe be more specific as to what you're trying to do?
>
> You can use recursion:
>
> $ n=6 a='(n-->1 ? a*(n+1) : 1)' zsh -c 'echo $((a))'
> 720
>
> (6!)
>
> Including via math functions, but within limits.
>
> $ n=0 a='(++n <= 255 ? a+2 : 1)' zsh -c 'echo $((a))'
> zsh:1: math recursion limit exceeded: (++n <= 255 ? a+2 : 1)
>
> And you can of course have command substitutions inside an
> arithmetic expression:
>
> $ echo $(( 1 $(for i ({2..6}) print "*$i") ))
> 720
>
> --
> Stephane
--
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Can you loop in math mode?
2019-08-19 6:41 ` Sebastian Gniazdowski
@ 2019-08-19 6:43 ` Sebastian Gniazdowski
0 siblings, 0 replies; 4+ messages in thread
From: Sebastian Gniazdowski @ 2019-08-19 6:43 UTC (permalink / raw)
To: Sebastian Gniazdowski, Zsh Users
On Mon, 19 Aug 2019 at 08:41, Sebastian Gniazdowski
<sgniazdowski@gmail.com> wrote:
> lines_lengths=( ${lines_lengths[@]/(#m)*/$(( sum += ${#MATCH}+1 ))} )
The line should say:
lines_lengths=( ${lines[@]/(#m)*/$(( sum += ${#MATCH}+1 ))} )
> : ${lines_lengths[@]/(#m)*/$(( append(${#MATCH}) ))}
The same – the line should say:
: ${lines[@]/(#m)*/$(( append(${#MATCH}) ))}
^ permalink raw reply [flat|nested] 4+ messages in thread
* Can you loop in math mode?
@ 2019-08-19 0:16 Sebastian Gniazdowski
0 siblings, 0 replies; 4+ messages in thread
From: Sebastian Gniazdowski @ 2019-08-19 0:16 UTC (permalink / raw)
To: Zsh Users
Hello,
is some kind of a looping possible in math mode?
--
Sebastian Gniazdowski
News: https://twitter.com/ZdharmaI
IRC: https://kiwiirc.com/client/chat.freenode.net:+6697/#zplugin
Blog: http://zdharma.org
^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2019-08-19 6:44 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
[not found] <CAKc7PVDnSqZMpQz=8L5b+SijziN1aUYkm0C-Pv3FMSVy-mg_0Q__8285.33232431568$1566173873$gmane$org@mail.gmail.com>
2019-08-19 6:20 ` Can you loop in math mode? Stephane Chazelas
2019-08-19 6:41 ` Sebastian Gniazdowski
2019-08-19 6:43 ` Sebastian Gniazdowski
2019-08-19 0:16 Sebastian Gniazdowski
Code repositories for project(s) associated with this public inbox
https://git.vuxu.org/mirror/zsh/
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).