main

main@lists.alug.org.uk

10364 discussions

PHP rounding
by Mark Rogers 14 Oct '09

14 Oct '09

Can anyone explain this code's output? <?php $x = (15/100) * 10.7; $y = 1.605; var_dump($x, $y, round($x,2), round($y,2),round(1.605,2)); ?> Result: float(1.605) float(1.605) float(1.6) float(1.61) float(1.61) In other words there is a difference between the values of $x and $y where they should both be 1.605 (and var_dump shows them both to be 1.605). I assume this is because $x isn't really 1.605, but something very close to (and slightly below) 1.605 due to a rounding issue, so rounding to 2 decimal places causes it to round down not up. But I'm not sure how to change the code to give the correct results? (15/100 you may notice as VAT; this is a VAT calculation, therefore I'm kinda duty bound to get the right result!) -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450C Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

10 19

Hi
by steve-ALUG＠hst.me.uk 13 Oct '09

13 Oct '09

Hi, I'm Steve, I've been aware of ALUG for a while but never got round to signing up to the mailing lists. I've finally got round to it (obviously!) I've been using Linux for several years, I started with Fedora (FC3 I think), then swapped to Ubuntu. I used to be a programmer, but that was using Windows. I've not done any programming for Linux yet - I expect to try it one day, when I get some time! Regards Steve

7 18

Re: [ALUG] PHP rounding
by Mark Rogers 12 Oct '09

12 Oct '09

I initially replied to James direct, as his email came to me not the list. This was my reply to him. His email to me wasn't exactly the same as his mail to the list so the quotes below won't match his list mails, but they're close enough. James Taylor wrote: > The problem here I believe is the .7 part of the 10.7. Try looking > into http://us2.php.net/manual/en/ref.bc.php if you require better > precision. (http://us2.php.net/manual/en/language.types.float.php has > a big warning box on it). > I thought the BC libraries would be my saviour, but: bcdiv("160.5",100,2) gives "1.60", which surprised me, given that 160.5 is now a string. (160.5 is 15 * 10.7). Unless the scale isn't supposed to round (making it equivalent to floor) in which case I can't see how I can then perform the rounding later without resorting to floating point maths at some stage. > Just out of interest, why do you round, and not floor or ceil (where > required?). I thought for tax you always rounded up (this is just my > own jumbled memories and might not be relevant or apply). > My understanding (and I'm neither lawyer nor accountant, and just write the code to meet the spec I'm given) is that there are lots of ways you can do VAT, but one way is to round each line on the invoice to the nearest pence (which is what we do), and another is to calculate the VAT against the ex-VAT subtotal (in which case you round up). However, the direction of rounding is presumably not significant in itself; I am sure there are calculations that could leave me rounding something like 1.70 up to 1.71 because 1.70 was actually a floating point value ever-so-slightly over 1.70. > Another quick solution is to try and move away from floats as your > currency - instead of representing things in pounds, we represent our > values in pennies, meaning we avoid using the decimal part - the > decimal part is ignored for the raw values: > We always do this for code we write from scratch; not least because its more reliable to store the pence value in a database and uses less storage space. But this code is something I'm maintaining and it supports currencies where there are more than 2 decimal places that are relevant, and it stores things as floats throughout. My idea to do a 2-stage rounding is easily proved to be a bad idea, btw: 1.6449 should round to 1.64, but if I round to 3dp then to 2dp I get 1.645 then 1.65 -- Mark Rogers // More Solutions Ltd (Peterborough Office) // 0844 251 1450 Registered in England (0456 0902) @ 13 Clarke Rd, Milton Keynes, MK1 1LG

2 2

Norwich Pub Meet Thursday 8th October.
by Montmorency 07 Oct '09

07 Oct '09

> Just a heads-up about the pub-meet tomorrow in the Coach and Horses, Thorpe Road. A table for ALUB has been booked. It is a large table, on the left- hand side of the glassed-in section at the rear of the pub. 7pm ish onwards. Montmorency montmorency(a)ukfsn.org bellphegore(a)nerdshack.com

1 0

HP Photosmart R507 can't be mounted
by Jenny Hopkins 07 Oct '09

07 Oct '09

And even worse - now I've sent it to alug social list! Oh someone shoot me now, please! .... Sorry Mark - I just realised that I sent this mail to you a few days ago rather than the alug list. 2009/9/29 MJ Ray <mjr(a)phonecoop.coop>: > Jenny Hopkins wrote: >> I've got a problem with an HP Photosmart R507 camera on an ubuntu >> jaunty system. The camera is set to behave as a disk drive. When >> plugged into a debian system it is assigned to be /dev/hdc1 and can be >> mounted. However, with the ubuntu, it won't assign a device. here is >> the tail of dmesg: >> >> [14522.580027] usb 4-4: new full speed USB device using ohci_hcd and address 4 >> [14522.805646] usb 4-4: configuration #1 chosen from 1 choice >> [14522.815803] scsi8 : SCSI emulation for USB Mass Storage devices >> [14522.840286] usb-storage: device found at 4 >> [14522.840295] usb-storage: waiting for device to settle before scanning >> >> lsusb shows the camera listed. > > Doesn't matter. It's not recognising it as a SCSI disk. It would show > something like: > > scsi 0:0:0:0: Direct-Access CBM Flash Disk 5.00 PQ: 0 ANSI: 2 > usb-storage: device scan complete > > Does it complete the scan? The only time i have anything like that was after reboot, when i got: [ 22.880604] scsi scan: INQUIRY result too short (5), using 36 [ 22.880618] scsi 6:0:0:0: Direct-Access HP PhotoSmart R507 A001 PQ: 0 ANSI: 0 [ 22.896587] sd 6:0:0:0: [sdb] 498176 512-byte hardware sectors: (255 MB/243 MiB) [ 22.901837] sd 6:0:0:0: [sdb] Write Protect is off [ 22.901846] sd 6:0:0:0: [sdb] Mode Sense: 0f 00 00 00 [ 22.901853] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 22.921851] sd 6:0:0:0: [sdb] 498176 512-byte hardware sectors: (255 MB/243 MiB) [ 22.928857] sd 6:0:0:0: [sdb] Write Protect is off [ 22.928865] sd 6:0:0:0: [sdb] Mode Sense: 0f 00 00 00 [ 22.928870] sd 6:0:0:0: [sdb] Assuming drive cache: write through [ 22.928883] sdb: sdb1 [ 22.948024] sd 6:0:0:0: [sdb] Attached SCSI removable disk [ 22.948163] sd 6:0:0:0: Attached scsi generic sg1 type 0 However trying to mount either sdb1 or sg0 denied they existed. Otherwise the plugging and unplugging of the camera just shows: [14522.580027] usb 4-4: new full speed USB device using ohci_hcd and address 4 [14522.805646] usb 4-4: configuration #1 chosen from 1 choice [14522.815803] scsi8 : SCSI emulation for USB Mass Storage devices [14522.840286] usb-storage: device found at 4 [14522.840295] usb-storage: waiting for device to settle before scanning and it never does. >Have you any suspicious-looking stalled > processes? Can you remove the USB devices and rmmod usb-storage or > does it complain that the module is in use? If so, something has > failed badly in the USB drivers and only a reboot will clear it, in my > experience. > The above reboot info suggests this could be a pointer. I'll check for stalled processes and do the rmmod things you suggest when i'm next in the same room as the camera and ubuntu over the next few days. > I've one camera (the Nisis DV4) which refuses to work on one > workstation in a similar way at the moment. I'm sure it used to work. > I think some USB devices are less than perfect and different kernel > versions trigger the problems. > >> I'm puzzled that lsmod doesn't show any e/ohci_usb type modules and >> won't probe for them, but maybe this is an ubuntu thing. > > "Won't probe for them"? Do you have the .ko files in /lib/modules? > Anyway, I don't think that's related. > Ok, I'll ignore it then. Thanks for the pointers - it would be great to go there and fix it instead of flapping around again. Someone muttered something about firmware - would there be any way i can check that out? Many thanks, Jenny

2 3

[ALUG Announce] Alug Norwich 2nd Thursday Pub Meet 8th October @ The Coach & Horses
by Adam Bower 07 Oct '09

07 Oct '09

ALUG Announce Please send announcements to Announce(a)lists.alug.org.uk Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce ----- Dear ALUG, This months second Thursday social meeting of ALUG will take place on 8th October 2009 at The Coach and Horses (82 Thorpe Road, Norwich, NR1 1BA http://www.thecoachthorperoad.co.uk/ ). This is our second meeting in the Coach and Horses and it offers food, a good selection of real beer (including takeouts!) and reasonably good connections for travel and parking. There should be people there from 8pm, hopefully someone will bring a Tux to aid people in recognising us. I look forward to seeing you tomorrow. Thanks Adam -- jabberid = quinophex(a)jabber.earth.li ----- Send discussion replies to main(a)lists.alug.org.uk (Reply-To set) Unsub, change settings via http://lists.alug.org.uk/mailman/listinfo/announce

1 0

Delays at earth.li?
by Ted.Harding＠manchester.ac.uk 02 Oct '09

02 Oct '09

Hi, I have just (08:40 BST, 30 Sept) received Sam Tuke's posting dated Sat, 26 Sep 2009 16:02:04 +0000. The successive headers encapsulating the delay are: Received: from col0-omc1-s16.col0.hotmail.com ([65.55.34.26]) by the.earth.li with esmtp (Exim 4.69) (envelope-from <samtuke(a)hotmail.com>) id 1MrZio-0005vC-VR for main(a)lists.alug.org.uk; Sat, 26 Sep 2009 17:02:07 +0100 Received: from localhost ([127.0.0.1] helo=the.earth.li) by the.earth.li with esmtp (Exim 4.69) (envelope-from <main-bounces(a)lists.alug.org.uk>) id 1Mstm5-0003BE-Tq; Wed, 30 Sep 2009 08:38:57 +0100 This isn't the first time recently that I've noticed substantial delays, though not on the 4-day scale until today. Is there a problem? Ted. -------------------------------------------------------------------- E-Mail: (Ted Harding) <Ted.Harding(a)manchester.ac.uk> Fax-to-email: +44 (0)870 094 0861 Date: 30-Sep-09 Time: 08:58:01 ------------------------------ XFMail ------------------------------

7 16

Backup/Recovery Options
by Alex Scotton 29 Sep '09

29 Sep '09

Hi there, I have seen this matter arise under a slightly different context many times on this mailing list and am sure a Google search will produce tonnes of results; however i thought I'd get some recommendations and some easy options for backing up my Linux OS: I would like to create an image of the Ubuntu 9.04 system running on my desktop PC, so that in the event I mess something up I can return to a system, that is already setup and 'tweaked', as apposed to dropping the install disk back in and starting again.. I would also like to look into doing this for other ubuntu pcs over the network and hosting these recovery images on my desktop pc... Would be awesome to have some sort of semi-automated process to recovering these images from the grub. Anyways cheers in advance for your help Alex Scotton

5 4

HP Photosmart R507 can't be mounted
by Jenny Hopkins 29 Sep '09

29 Sep '09

Hullo List, I've got a problem with an HP Photosmart R507 camera on an ubuntu jaunty system. The camera is set to behave as a disk drive. When plugged into a debian system it is assigned to be /dev/hdc1 and can be mounted. However, with the ubuntu, it won't assign a device. here is the tail of dmesg: [14522.580027] usb 4-4: new full speed USB device using ohci_hcd and address 4 [14522.805646] usb 4-4: configuration #1 chosen from 1 choice [14522.815803] scsi8 : SCSI emulation for USB Mass Storage devices [14522.840286] usb-storage: device found at 4 [14522.840295] usb-storage: waiting for device to settle before scanning lsusb shows the camera listed. The running modules after this show: Module Size Used by vfat 18816 0 fat 58272 1 vfat binfmt_misc 16776 1 ppdev 15620 0 bridge 56212 0 stp 10500 1 bridge bnep 20224 2 video 25360 0 output 11008 1 video input_polldev 11912 0 nfsd 228012 17 auth_rpcgss 42144 1 nfsd exportfs 12416 1 nfsd nfs 266600 2 lockd 74284 2 nfsd,nfs nfs_acl 11136 2 nfsd,nfs sunrpc 195552 23 nfsd,auth_rpcgss,nfs,lockd,nfs_acl lp 17156 0 parport 42220 2 ppdev,lp snd_hda_intel 434100 3 snd_pcm_oss 46336 0 snd_mixer_oss 22656 1 snd_pcm_oss snd_pcm 83076 2 snd_hda_intel,snd_pcm_oss snd_seq_dummy 10756 0 snd_seq_oss 37760 0 snd_seq_midi 14336 0 snd_rawmidi 29696 1 snd_seq_midi snd_seq_midi_event 15104 2 snd_seq_oss,snd_seq_midi snd_seq 56880 6 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_seq_midi_event snd_timer 29704 2 snd_pcm,snd_seq snd_seq_device 14988 5 snd_seq_dummy,snd_seq_oss,snd_seq_midi,snd_rawmidi,snd_seq pcspkr 10496 0 snd 62756 15 snd_hda_intel,snd_pcm_oss,snd_mixer_oss,snd_pcm,snd_seq_oss,snd_rawmidi,snd_seq,snd_timer,snd_seq_device shpchp 40212 0 soundcore 15200 1 snd snd_page_alloc 16904 2 snd_hda_intel,snd_pcm usb_storage 99648 0 usblp 20224 0 usbhid 42336 0 forcedeth 61712 0 fbcon 46112 0 tileblit 10752 1 fbcon font 16384 1 fbcon bitblit 13824 1 fbcon softcursor 9984 1 bitblit (sorry about large list...) I've been googling for hours, and the closest thing I have found is a bug report in libgphoto_2 here: https://bugs.launchpad.net/ubuntu/+source/libgphoto2/+bug/355998 but the bug is reported fixed and the version being used is 2.4.2-0ubuntu4. I'm puzzled that lsmod doesn't show any e/ohci_usb type modules and won't probe for them, but maybe this is an ubuntu thing. Any hints warmly welcomed. Thanks, Jenny

2 1

sharing a dvd writer amongst linux boxen
by Jenny Hopkins 28 Sep '09

28 Sep '09

Hullo, erm, again.... Out of curiosity: If I have a debian server (no X window system installed) that has a cd/dvd burning drive on the same intranet as a debian client that has no dvd burner, is there any method known to man or beast that can allow the server drive to be shared? First, I'm not sure how to include the drive in exports, as surely it isn't mountable with just a blank medium in it? Secondly, if I could somehow do the latter, how would I tell the dvd burning GUI that the medium to be used is an nfs mounted share? Thanks, Jenny

2 1

Jump to page:

2025

2024

2023

2022

2021

2020

2019

2018

2017

2016

2015

2014

2013

2012

2011

2010

2009

2008

2007

2006

2005

2004

2003

2002

2001

2000

1999

1998

1997

main