My system is overheating frequently, and sometimes it shuts down, so I think I have to install the AMD/Intel Hybrid drivers to fix this problem... My laptop is  and I am running Xubuntu 16.04 amd64 (I made a zero installation today).  02:00.0 VGA compatible controller [0300]: Advanced Micro Devices, Inc. [AMD/ATI] Thames [Radeon HD 7550M/7570M/7650M] [1002:6841] (prog-if 00 [VGA controller])   This is what I have tried:   Installing drivers with sudo apt-get install fglrx fglrx-amdcccle fglrx-dev -- didn't work. Installing drivers with .deb packages from  -- didn't work. Following the instructions here and here -- didn't work.   Now I am trying to install the drivers manually, as described  and in  using  that I have downloaded from AMD Website.  When I try to run the .run file as root, this error message appears:  ERROR: Please install the required pre-requisites before proceeding with AMD Catalyst installation. Please check file usr/share/ati/fglrx-install.log for more details   I have checked the /usr/share/ati/fglrx-install.log and the content is:  NOTE: If your system has logged the missing packages required for installation, install them in the order as per the log file to resolve package-dependency issues.  fglrx installation requires that the system has kernel headers.  /lib/modules/4.4.0-22-generic/build/include/linux/version.h cannot be found on this system. Install kernel headers using the command apt-get install linux-headers-4.4.0-22-generic.   So I ran sudo apt-get install linux-headers-4.4.0-22-generic and:  Reading package lists... Done Building dependency tree        Reading state information... Done linux-headers-4.4.0-22-generic is already the newest version (4.4.0-22.39). 0 upgraded, 0 newly installed, 0 to remove and 0 not upgraded.
I have 14.04.5/16.04 or newer and an AMD GPU. I'm not getting the performance I want, and some programs say they need things like OpenCL.  I've heard about fglrx, but if I try to install it on my machine, it breaks and I have no GUI.  Is there anything I can do to get my AMD card working to its full potential?
Why do we let hostile users dictate the perception of Stack Overflow? How to vertically center content with variable height within a div? What are suitable TV sizes and viewing distances for couch surfing on a 1080p LCD HDTV? I am working on a proof about Dedekind cuts on the positive rational numbers. I have been stuck for a while on the following point and would appreciate any help.  Given $x\in \mathbb{Q}^+$ such that $x^2&lt;2$, how to find $y\in \mathbb{Q}^+$ such $y&gt;x$ and $y^2&lt;2$? What Sci-Fi book (1987 or older) had Aliens conquer earth and made Humans their slaves? I have been trying to recall the title of a book I read about 25 years ago (1987), I have tried to find it again a couple of times over the years without any luck.    The story takes place on earth, which has been invaded and conquered by aliens.  The humans have become servants or slaves.  One of the primary human characters is the human servant of an alien leader.  If I remember correctly, the aliens are much bigger than humans, I keep thinking of horses or elephants for some reason with regard to the aliens.  At the end, somehow the human slaves have forced the aliens to abandon their conquest of earth, but I don't remember exactly why.  I think it was something to do with simply refusing to be obedient, which the aliens could not comprehend, but I'm not sure about that.  I think the book ends with the alien leader (and the rest of the aliens) blasting off from earth in a rocket.  Does anyone recognize what book I'm referring to?  Thanks for any help! I am wondering, given the minimal polynomial of $A$, what can we say about the minimal polynomial of $A^n$?  I know that if we were looking at the roots of the characteristic polynomial ie eigenvalues then the roots of the characteristic polynomial of $A^n$ would be $nth$ powers of the eigenvalues so again these are roots of the minimal polynomial also. Any way to sync directory structure when the files are already on both sides? I have two drives with the same files, but the directory structure is totally different.  Is there any way to 'move' all the files on the destination side so that they match the structure of the source side? With a script perhaps?    For example, drive A has:    /foo/bar/123.txt /foo/bar/234.txt /foo/bar/dir/567.txt   Whereas drive B has:  /some/other/path/123.txt /bar/doo2/wow/234.txt /bar/doo/567.txt   The files in question are huge (800GB), so I don't want to re-copy them; I just want to sync the structure by creating the necessary directories and moving the files.  I was thinking of a recursive script that would find each source file on the destination, then move it to a matching directory, creating it if necessary. But -- that's beyond my abilities!  Another elegant solution was given here: Windows 8 removes Grub as default boot manager I have a time series that shows a nonstationary seasonal autoregressive component as well as known heteroshedasticity. In order to model the series, I have fit a seasonal ARIMA model for the mean with the auto.arima model in the forecast package in R and a GARCH model on the residuals of the ARIMA model.   Is the procedure of sequentially estimating ARIMA and GARCH model correct or would it have been better to jointly model the mean and the variance of the series? If this were correct, is there a (possibly R) function to do it? Does scikit-learn have forward selection/stepwise regression algorithm? I'm working on the problem with too many features and training my models takes way too long. I implemented forward selection algorithm to choose features.  However, I was wondering does scikit-learn have forward selection/stepwise regression algorithm? How to remove feeds from WordPress totally? I want to completely remove feeds from WordPress. I am using this little function from    /** * disable feed */ function fb_disable_feed() { wp_die( __('No feed available,please visit our &lt;a href="'. get_bloginfo('url') .'"&gt;homepage&lt;/a&gt;!') ); } add_action('do_feed', 'fb_disable_feed', 1); add_action('do_feed_rdf', 'fb_disable_feed', 1); add_action('do_feed_rss', 'fb_disable_feed', 1); add_action('do_feed_rss2', 'fb_disable_feed', 1); add_action('do_feed_atom', 'fb_disable_feed', 1);   Still there is tons of transient options.. like _transient_feed_mod or _transient_timeout_feed_mod  How can i completely remove feeds from WordPress? How to remove time from date? I am having trouble coming up with a consistent method of determining the direction of static friction.  So far the best I have come up with is: it should oppose the relative acceleration the contact point would have parallel to the surface of contact in its absence.  This seems to work up to a point:   A block sits on a rug. The rug is pulled to the left. The relative acceleration of the block to the rug is to the right. So static friction must act (in the frame of the rug) to the left.  A cyclist makes a turn to the right and leans to the right. The torque that his weight puts about the contact point will make it accelerate to the left relative to the ground in the absence of friction. So the ground sees static friction pointing to the right. A coin rotates with a turntable. In the absence of static friction, the table sees a centrifugal force on the coin that will make it accelerate away radially from the centre of rotation. So friction must act radially towards the centre of rotation, in the frame of the table.   But then I run into some difficulties.   (already solved; see first answer) A cyclist makes a turn to the right. As a result he leans to the right. The resulting torque around the centre of mass causes the point of contact to slide to the left in the absence of static friction, so static friction must act to the right. However, now the cyclist as a whole must make circular motion with static friction acting as the centripetal force. As there is no torque, this means the contact point must move along with the centre of mass and therefore act as something with an acceleration to the right. So according to my understanding of static friction, another layer of it must now be added acting to the left. Why is it not? A car enters a banked curve with speed $v$. Suppose the curve is banked at the right angle for the car to make circular motion in the absence of friction. In the absence of any static friction, therefore, the car's acceleration points towards the centre of the banked curve. However, in this case the car's acceleration still has a downward component along the slope. My understanding of the direction of static friction means therefore, when it is added in, it should act up the slope. But in reality no static friction is produced in such a case.   Can someone explain what is wrong with my method of finding the direction of friction? Or if there is nothing wrong, how have I misapplied it in this case to create this paradox? How to find the joint PDF? Ley X,Y two random variables with density $f(x,y)=8xy \  \text{if} \   0&lt;x&lt;y&lt;1$  Find the joint distribution F(x,y).  I find that $F(x,y)=2x^2y^2-x^4\ \text{  if}  \ 0&lt;x&lt;y&lt;1$ but I dont know how to find the didtribution in other points. mathpazo + siunitx: π turns into ß When I use mathpazo and siunitx (version 2.3h) together, if I use \pi inside the numerical argument to \SI, it will show up in the output as "ß".  \documentclass{article} \usepackage{mathpazo, siunitx} \begin{document}     $\pi + \SI{\pi}{\ohm}$ \end{document}   Produces:    But when I don't use mathpazo:    Why does this happen and how can I fix it? How does Newtonian mechanics explain why orbiting objects do not fall to the object they are orbiting? The force of gravity is constantly being applied to an orbiting object.  And therefore the object is constantly accelerating.  Why doesn't gravity eventually "win" over the object's momentum, like a force such as friction eventually slows down a car that runs out of gas?  I understand (I think) how relativity explains it, but how does Newtonian mechanics explain it? What is the difference between '/' and '//' when used for division? Creating new users using PHP not recognized by Apache 2.4 I have a server setup where new linux users are created using (PHP)  shell_exec ( '/usr/sbin/useradd ' . $username ); exec ('usermod -a -G ' . $username . ' '. $username); #add user into the usergroup exec ('usermod -a -G ' . $username . ' www-data'); #add usergroup with the www-data   And then the user script changes the owner and group of the files to this owner. The server is setup with suPHP which then allows these files to be run as the owner.  This setup worked fine with Apache 2.2 but is breaking in Apache 2.4. Everything works fine except when I try to oepn the files, it gives a 403 forbidden error. Restarting apache after the user is added fixes the issue but that is not a viable solution for me. The users are added using a web server and hence I need to be able to do this without having to reload/restart apache everytime.  I have searched for serveral hours and tried to fix the issue but haven't been able to do so! I am running ubuntu 14.04 and I am not able to downgrade to apache 2.2 as well. Problem understanding the logistic regression link function Is the word "data" now considered singular? If so, what about "datum"?