So I wanted to use R's graphics to visualize information, but when I typed
Code: Select alldemo (graphics::graphics), R's built-in introduction to its graphics, the separate window opened up with no graphics, and the terminal returns
Code: Select allError in plot.new() : attempt to plot on null device.
I have the core Jessie packages for R, so I don't think that is the issue.
I have a server running Red Hat Enterprise Linux ES (2.6.9.55.ELsmp). When it starts up I get the following error: Uncompressing Linux... Ok, booting the kernel. Red Hat nash version 4.2.1.10 starting WARNING: can't access (null) exec of init ((null)) failed!!!: 14 unmount /initrd/dev failed: 2 Kernel panic - not syncing: Attempted to kill init!
After that I got no response from the OS. I have the installation CD, so I tried to start the rescue mode, while going through the steps I received an error stating that mounting to /mnt/sysimage failed and that if I want to I can access a shell. I really don't know what to do from here
#!/bin/bash
sed -n 8p file.txt
returns the 8th line to the StdOut.
If I assign the value to the variable line = $(sed -n 8p file.txt)
and now print it out with echo
echo $line
the line would be printed.
But what if the file has only 4 lines. What value would be assigned to the variable line?
I want to know that because I want to only print it if the value is "something", that is not null.
In Java for example I would do it like this...
String line = "";
line = reader.readLine(); // or anything else..
if(line!=null){
System.out.println(line);
}
How would I check if the value is not "null"(I don't know if bash knows null)
VFS: Cannot open root device "<NULL>" or unkown-block(202,17)
append a correct "root=" boot option
Kernel panic not syncing
VFS: unable to mount root FS on unkown-block(202,17)
I have a Dell xps with a dual core, 8 gigs ram, a primary hard drive with vista on it, and a secondary with linux in its future. It starts loading vmlinuz but ends up with the kernel panic before anything else. I am able to install earlier cores (5-8) and vista recognizes the ram just fine.
I got a problem with my kernel. The initramfs source is busybox, python and gcc from ubuntu. The busybox have i compiled it self. Python and gcc is from /usr/bin. I gonna install my kernel on a i586 machine. Old yes. On the xTerm (termial) it stand "root device 8,1).
Quote:
VFS: Cannot open root device "sda1" or unknow-block(0,0) append a correct "root=" boot option; here are the available partions: Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block(0,0)Pid: 1, comm: swapper Not tainted 2.6.38.3 #1
Call trace: This is my syslinux.cfg
default menu.c32
prompt 0
menu title BOOTLOADER
[code]....
Currently running rc2. Downloaded 11.2 final DVD, md5sum is good, burned DVD, YaST says media check is good. (And for completeness burned a second DVD and get the same problem.)
On booting from the DVD I select "Installation" - a kernel loads and starts checking available h/w devices then crashes with the above message.
Followed by Please append a correct "root=" boot option.
Tried with root=sda1 (partition that is /) and only change is unknown-block (0,0)
My best guess is that I have EXT4 (did a clean install of RC2)? And/or I dont have a swap partition?
I have a vector of bytes that I need to store in a DB2 database and was wanting to do it with a column declared as VARCHAR () FOR BIT DATA. I can do this with no problem except when a byte representing the NULL character occurs in the vector. Anytime this occurs, the rest of the bytes are truncated. I know this is the proper behavior for if this were a string, but I was under the impression that if the column is declared as I previously mentioned, that this would support any variable length binary data including the NULL character.
I've found repeated references to people dealing with DB2 tables where the data in VARCHAR columns contained leading and embedded NULLS, so I know this is possible. Can anyone provide me with the proper INSERT statement in order to get this to work? This is the current BindParameters call I'm making for the VARCHAR () FOR BIT DATA column that's truncating after the NULL character occurs.
Code:
SQLBindParameter(handleStmt, 3, SQL_PARAM_INPUT, SQL_C_CHAR,
SQL_VARCHAR, (SQLUINTEGER)(30000), 0, data2, 30000,
&sqlNts);
If I have a Query that returns columns where some of the values are NULL, is it possible to tell SQL to return all the NULL values as empty strings instead of the NULL datatype?
If the solution is vendor specific I am (unfortunately) using a Microsoft 2008 SQL server.
Example:
Code:
Select * from imaginary_table where id = 1
Might return:
Code:
Id: 1
Name:xyz
[Code].....
I need to read a binary file using my C++ application. That binary file may contain arbitary characters and it also contains 0 at some places. I need to read the file without considering null terminating character. (i.e. considering 0 as a normal byte and not as the end of the string)Can some one suggest me a method to read the buffer while ignoring the null terminated character.
View 4 Replies View RelatedI have the following working script. It checks the directory for txt files, if files are there, it copies to another directory or gives error. I would like to exclude "file not found" errors and send them to /dev/null. All other errors should go to the email address as usual.
Code:
#!/bin/bash
function err
{
if [[ $? -ne 0 ]]
[Code]....
I've all of a sudden been getting permission denied for almost everything I try to do. Upon logging in, I get a huge amount of "/dev/null: Permission denied"
The only way I can manage to get to the terminal is by Ctrl-C. It never brings up the command line, unless I do that.
If I try to startX, I get errors, also saying permission denied, and then one that says
Code:
I also get many "failed" errors when booting, most of them saying that a file could not be found/located.
Check the thread link at the top for other information in the first post.
I could reinstall Debian, but the computer I am using is a Libretto 110CT (64MB RAM), which has only a PCMCIA drive, for which I have a USB port replicator. There is no CD drive.
It was also a custom install fitted for the computer, so I'd rather not have to set everything up again, nor would I know how to exactly, as I've never done it before.
I run a mediaserver on Archlinux, working perfectly (or almost). I have set up NFS v3 and that worked for me on these clients:
- Debian Lenny
- Archlinux 64bit
Now I've upgraded my Lenny-box to squeeze and I see that 2 of my 3 shared folders (tdone and twatch) are mounted like they should and the third one (media) doesn't come up. A 'mount -a' as root gives this error: mount.nfs4: access denied by server while mounting (null) My relevant fstab-lines:
[Code]....
how I can go about debugging this?
how can i search bluetooth device in linux(redhat) without graphics
View 1 Replies View RelatedI really wanna use the OS. I wiped my laptop and installed it but I can't change my screen resolution (it's stuck at 1024 X 768 and my refresh rate is at 0 HZ) I tried installing a driver that was for both the i9xx and i8xx chipset family but it doesn't look like it helped anything. I want to be able to play World of Warcraft Wrath of The Lich King but when I try it the way the computer is now the the frame rate is really really slow. I also need to fix my audio because there's crackling that comes from the speakers often. I attached a screen shot of what I get when I enter the command: sudo lshw -c video Changing the resolution isn't the problem so much as the fact that I can't change the refresh rate from "0 HZ" to anything higher so that my game will play smoothly. I would also like to put compiz fushion on my laptop as well but I don't believe it will work unless I resolve this problem.
View 9 Replies View RelatedDoes an O.S need a Windows system manager to view anything or can text be displayed without it? Also does anyone know of a decent guide/tutorial on X or the applications that X includes?
View 6 Replies View RelatedThere are a few very important man pages having UTF-8 translations. Those UTF-8 man pages cannot be viewed unless a groff wrapper (http://www.haible.de/bruno/packages-groff-utf8.html) is also installed.
Please either remove those man pages or include that groff-utf8 wrapper in slackware.
[Edit] I believe removing those man pages is better since the translations are often incomplete and inaccurate.
using the System->Preferences->Remote Desktop i have setup a fresh ubuntu install to share its screen.
from my OSX 10.6 machine, i have tried connecting via Chicken of the VNC and Jolly's Fast VNC Client, both will successfully connect and show the full screen on access, but fail to update the screen after this.
the only way to update it is to disconnect my VNC session and reconnect again.
the Ubuntu desktop is being VERY responsive to mouse gestures over VNC, so this seems to be a one way issue.
I have just tested this 3 times now and everytime I got the same result. I have two identical servers, they are both IBM x345 and everything has been copied directly from one to the other so they are exact duplicates other than the hard drive and partition sizes. When copying over the /svn directory it looks like everything copied successfully (I have tested rsync and cp) but when I go to look at the files locally there is nothing there. I can view the files without issue over the nfs share that I am using to copy the files but nothing is there locally. Even df shows that there is nothing there. The other server on the network shows the files there and using du I can see that the size is correct on all of them.
Before anyone suggests this is a permission issue, I was using root to see if the files are there but even root does not see anything. I am completely lost on this and even google does not seem to come up with anything. The servers are running fedora 12, the /etc/exports file is placed below.
Code:
/ export 10.0.0.201(rw,no_root_squash)
I have tried to set up the desktop version of the server . In my apache2.conf file I have changed the following lines-
Code:
# Include the virtual host configurations:
#Include /etc/apache2/sites-enabled/
Include /home/www/websites/
Yes I do keep the default values commented out
In my virtual host file I have made the following changes to the DocumentRoot, and to one of the <Directory>; the rest of the file doesn't appear here as nothing was changed.
Code:
<VirtualHost *:80>
ServerAdmin webmaster@localhost
# DocumentRoot /var/www
[Code]....
I've been having this problem when viewing online videos/tv, primarily channel4.com/4od and similar sites.
The videos load up and play with no problems, but if the view is shifted away from the video (e.g. scrolling down the page so the video is no longer visible or switching to another tab or window), after a little while (up to a few minutes) the audio from the video stops and, upon returning to the video window, the video has been replaced with a light grey rectangle. The problem seems to be different from others described here since the videos themselves are running with no problem until the view shifts away from them. Flash-based chat applications have the same problem.
I'm running Firefox 3.6.15 in Ubuntu 10.10 (Maverick). All systems updated repeatedly, as far as I know the problem has existed forever. The issue doesn't seem to exist in Chromium, interestingly (but I prefer Firefox...)
Any suggestions on diagnostics to try to find the cause and solution?
I want to track the number of requests that a file gets downloaded and viewed.
What I have is mp4 files on the server and they could either get played in flash player or downloaded via mobile or whatever.
I need to see how many times that files gets downloaded or viewed. Since its in a php page I am able to track the number of views. But I want to able to track the direct downloads.
I was thinking something along the lines of htaccess redirect to php then to file.
But that would mess up the player from playing the file I would think. I am not sure how to make that happen with the htaccess either though.
i am having dell inspiron 1540 laptop installed with ubuntu 10.04 (updated). i wanted to install LAMP(Linux,Apache,MySQL,PHP) for software development purpose.
but after restarting the system, following things occured:-Message box appears saying "Ubuntu is running in low-graphics mode" Your screen, graphics card and input device setting could not be detected... OK
Then i get prompt saying what would you like to do ?Run ubuntu in low-graphics mode for just one session.
i get a message starting display in one minute.....nothing happens ... i switch to text mode by pressing
escape. There is a brown color star before: Speech dispacher configured for user sessions.on battery state there is a infinte loop i.e. no response and system just hangs there...startx at text mode makes the screen blank...
Please tell which part of '/var/log/Xorg.0.log' sholud be scanned to find required information.
i am a new to ubuntu How to solve this problem i donot have internet connection and its important that i get it repaired as soon as possible....essential to get it running else i will be forced to goto Windows...
I did searched you tube but my results were not great.I have 2 books on KernelProgramming.I feel I need if some where I can get a video tutorial which can help me to understand how to develop a Linux Device driver that will be great.I had a look at Greg Kroah Hartmans video lecture of developing patches on ......I have been reading books and a lot of stuff.So I wish if I could get a video lecture that would be better
View 1 Replies View RelatedHttp://ocw.mit.edu/courses/electrica...res/lecture-4/
The above lecture can not be viewed in Full Screen mode . When the full screen displaying point is clicked the video stops and only the sound goes on.
To where shall I report this?
I am using Fedora 15
I'm running apache2 on Hardy and Karmic machines. I converted some .flv's to .wmv's using VLC and embedded them in my index.html file. Now, when I go to view them from Vista machines (32 or 64, IE or Firefox), they look compressed or skinny like this: [URL] When viewed on other Ubuntu or XP machines, they look fine.
View 6 Replies View RelatedWhen sending an HTML formatted email with KMail and viewing this email on an MS Exchange Outlook client, all the empty lines are removed. This appears to be a known issue (KMail & HTML. - KDE Community Forums), but I was hoping anyone here knows a workaround for this....?
This is REALLY annoying when using KMail in a business setting, since emails look embarrassing on a customer's email client (which is in 99% of the cases Outlook, I'm afraid).
I installed slackware 13.1 x86_64 bit with multilib, and its been about a month already, I'm really enjoying slackware but I am being troubled with my nvidia card, and I need to get my 3D acceleration working. And I've been looking around the net for information and kept on trying to make my nvidia card to work but to no avail. I cant get X to start, once I put in a xorg.conf stating to use the nvidia card. After troubleshooting for almost 2 weeks and now at my wits end, I now come humbly looking for help in linuxquestions slackware community forum.I've installed nvidia 64 bit kernel, drivers from slackbuilds (version 256.44). The laptop model I'm trying to get it working is an -ASUS K52J Intel Core i3 2.40Ghz with 2GB RAM and with an Nvidia Geforce 310M with 1GB dedicated VRAM.
View 14 Replies View RelatedMy boss is looking to use Linux for an embedded device that will require some 2D graphical output. Ideally I'd want to do this without the use of X.
Ideally what we are looking for is something that is easy to program for and could execute without initializing an x-windows system. If we do need to program inside of X what would be the best approach for creating a full-screen dedicated 2D interface?
i have newly installed fedora..and i wanted to know..whether the graphics in c++ can be used in a normal way...if not... i need the code for changing the background color and color of the font. And i want to know..as we cannot use conio.h..how can we clear the screen..in turbo we used to use clrscr()..but what do we use in c++ Its for a project.
View 14 Replies View Relatedi want to develop some c++ graphics programs using vi editor.i m currently using Fedora
View 4 Replies View Related