From: pjb@informatimago.com (Pascal J. Bourguignon)
To: help-gnu-emacs@gnu.org
Subject: Re: How modify numbers in a region by a multiplier?
Date: Thu, 01 Jul 2010 20:54:02 +0200 [thread overview]
Message-ID: <87lj9vxcc5.fsf@kuiper.lan.informatimago.com> (raw)
In-Reply-To: mailman.1.1278003297.20718.help-gnu-emacs@gnu.org
Qiang Guo <mcknight0219@gmail.com> writes:
> At Thu, 1 Jul 2010 13:55:11 +0000 (UTC),
> Seweryn Kokot wrote:
>>
>> Hi,
>>
>> I would like to modify numbers in a region/buffer by a given multiplier.
>>
>> Imagine that I have some numbers
>>
>> 33.444 3333 4433.4443 3344 .34234
>>
>> and I want them multiplied for example by 0.1
>>
>> to receive
>>
>> 3.3444 333.3 443.34443 334.4 .034234
>>
>> I tried with this function I wrote, but it doesn't work properly.
>> Any idea why?
>>
>> (defun my-multiply-numbers-in-region-or-buffer (multiplier)
>> (interactive "nGive multiplier: ")
>> (let (beg end object)
>> (if (use-region-p)
>> (progn
>> (setq object "region")
>> (setq beg (region-beginning))
>> (setq end (region-end)))
>> (setq object "buffer")
>> (setq beg (point-min))
>> (setq end (point-max)))
>> (goto-char beg)
>> (while (re-search-forward "\\([0-9]*\\.?[0-9]*\\)" end t)
>> (replace-match (format "%.3f" (* (string-to-number (match-string 1))
>> multiplier))))
>> (message "Numbers in %s modified by multiplier %s." object
>> multiplier)))
>>
>>
>
>
>
> Hi,
>
> The problem is the re-search-forward. It should be
> dynamically changed according to the replace events, since
> the (point) would exceed the variable end after replacement.
Obviously NOT!
The point is a marker, not an integer.
(with-temp-buffer
(insert "aaa-bbb-ccc")
(goto-char 0)
(when (re-search-forward "\\(b+\\)")
(replace-match "xxxxxx")
(insert "|"))
(buffer-substring (point-min) (point-max)))
--> "aaa-xxxxxx|-ccc"
--
__Pascal Bourguignon__ http://www.informatimago.com/
next prev parent reply other threads:[~2010-07-01 18:54 UTC|newest]
Thread overview: 28+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-01 13:55 How modify numbers in a region by a multiplier? Seweryn Kokot
2010-07-01 14:16 ` Juanma Barranquero
2010-07-01 14:31 ` Seweryn Kokot
2010-07-01 15:56 ` Juanma Barranquero
2010-07-01 20:10 ` Seweryn Kokot
2010-07-01 20:16 ` Juanma Barranquero
2010-07-01 20:36 ` Seweryn Kokot
2010-07-01 22:38 ` Juanma Barranquero
2010-07-02 6:41 ` Seweryn Kokot
2010-07-02 9:33 ` Juanma Barranquero
2010-07-02 9:53 ` Seweryn Kokot
2010-07-02 10:05 ` Juanma Barranquero
2010-07-02 18:15 ` Štěpán Němec
2010-07-02 20:30 ` Juanma Barranquero
2010-07-05 9:49 ` Seweryn Kokot
2010-07-05 11:46 ` Juanma Barranquero
2010-07-05 13:40 ` Seweryn Kokot
[not found] ` <mailman.4.1278330410.9916.help-gnu-emacs@gnu.org>
2010-07-05 13:30 ` David Kastrup
[not found] ` <mailman.2.1278016589.8594.help-gnu-emacs@gnu.org>
2010-07-01 20:42 ` David Kastrup
2010-07-01 21:03 ` Andreas Politz
2010-07-01 15:01 ` Dan Davison
2010-07-01 20:16 ` Seweryn Kokot
[not found] ` <mailman.0.1277993821.20412.help-gnu-emacs@gnu.org>
2010-07-01 14:19 ` David Kastrup
2010-07-01 16:54 ` Qiang Guo
[not found] ` <mailman.1.1278003297.20718.help-gnu-emacs@gnu.org>
2010-07-01 18:54 ` Pascal J. Bourguignon [this message]
[not found] <mailman.0.1277992530.1006.help-gnu-emacs@gnu.org>
2010-07-01 14:19 ` Marc Mientki
2010-07-01 15:55 ` Andreas Politz
2010-07-01 16:45 ` Pascal J. Bourguignon
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