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In the 3d-view workspace, we can use a random color to give our separated object a distinct look.  What if I don't like the result and I want to randomize the color again?   Swapping the setting doesn't change the random seed in color.    (Blender 2.80.64.) What are suitable TV sizes and viewing distances for couch surfing on a 1080p LCD HDTV? I've been trying to find this darn series of books for ages, I read them back in early 2001-02 and can't really remember much of them. I think there were 10-ish books, it was an easy read but a long series. On early publications, the covers, were mainly yellow, with small pictures of whatever happens in that book.  The book began with two siblings, a brother and a sister, running in a forest. She conjures up what can only be remembered as a golem type creature. He then uses a high magic 'blast' and wipes out the golem, knackering himself. His sister laughs at him for being 'powerful' but expending himself too much on one big magic blast. The beginning I remember vividly, the rest, not so much.  The story continues as a conflict happens, I believe two worlds are involved? The brother and sister are split up, but this is where my memory becomes vague.  The mechanics of the world seems that there are gems, or stones, set in the backbone, which in turn give access to magic. When the person uses them, they can draw too much, which ends up exhausting them. The 'big bad evil king' kills their father, and destroys their farm early on in the story. How to properly indent PHP/HTML mixed code? Blender 2.8 - AWS EC2 command line EEVEE render I have been trying to get this to work for a couple days now. I have an EC2 P2 instance with NVIDIA CUDA configured by default, its a Deep learning Ubuntu AMI. This OS does not have a GUI so everything is via terminal.  I downloaded Blender's 2.8 TAR file for Linux and set it up on the EC2 instance. And ran the following command from the directory where the TAR file is extracted:   ./blender -b -noaudio /home/ubuntu/file.blend --render-output . --engine BLENDER_EEVEE --render-format PNG --verbose 4   All I see in the output is this:  Blender 2.80 (sub 75) (hash f6cb5f54494e built 2019-07-29 17:17:04) found bundled python: /mnt/blender/blender-2.80-linux-glibc217-  x86_64/2.80/python Read blend: /home/ubuntu/file.blend  Blender quit   Don't know why its quitting but I am unable to debug this any further. Any help would be appreciated.  UPDATE: As per @rjg's recommendation, ran the following command:  ./blender -b -noaudio /home/ubuntu/file.blend --render-output . --engine BLENDER_EEVEE --render-format PNG -f 1 --verbose 4   Got the following error:  Blender 2.80 (sub 75) (hash f6cb5f54494e built 2019-07-29 17:17:04) found bundled python: /home/ubuntu/blender/blender-2.80-linux-glibc217-  x86_64/2.80/python Read blend: /home/ubuntu/file.blend Unable to open a display Aborted (core dumped) Do SAS expanders work transparently with SAS controllers? I'm new to SAS expanders and I'm trying to get things right. I understand that SAS expanders, when used with SAS controllers which supports expanders, allows you to utilise the full capacity of supported drives on a controller.  However, say I've got a SAS controller with 4 x SSF-8087 ports, which by itself would support 16 disks. I could then, as far as I understand, instead connect each of these ports to an expander to increase disk capacity.  However, will the SAS controller "see" all disks as if they were connected directly to the controller and not through an expander. Could I look at controllers as switches in a network? Would I be able to create a RAID from a disk on expander 1 and expander 3?  UPDATE:  I don't really have a specific project where I need to use SAS expanders. I'm just curious about how they work, and was thinking about how it would work if I used one or more SAS expanders with a LSI MegaRAID controller (9260-16i) which is running in one of our servers. However, I haven't really put any thought into the distinction between "local" disks and disks in another enclosure. The LSI MegaRAID controller has 4 SFF-8087 ports, which makes it capable of accomodating 16 drives. How to make a redstone clock that I can turn on/off with a lever? I want to create a Redstone clock that can be enabled and disabled with a lever permanently placed down. Errors "*ERROR* UVD not responding, trying to reset the VCPU!!!" ACPI error when trying to make dual boot with Ubuntu 18.04 and Windows 10 pgfplots: percentages and endvalues in stacked ybar I have two questions regarding the pgfplots package. I have attached the source code I worked on. There are two features I am not able to realize:   I would like to put the total value (sum of the whole stacked bar) on top of the bar, rotated by 90°. For me, it was only possible yet to get the value of each part of the stacked bar by using the nodes near coords command. Additionally, the percentage of each part of the stacked bar as relative to the whole stacked bar should be displayed in the bar, also rotated by 90° (addition equals 100%)   If it is somehow possible, percentages should have only one significant digit, and those below 5% should not be displayed in the bar. I know this is a pretty complex example, but maybe there is one who can solve it.  \documentclass{article}  \usepackage{pgfplots,pgfplotstable}   \usetikzlibrary{pgfplots.groupplots}    \pgfplotsset{compat=1.8}   \pgfplotstableread{  Criterion  ddd     ccc     vvv   (0)    700         750         750   (a)    700         750         750   (b)        1200        750         750       (c)    33      345     345  (d)    34      333     345  (e)    234     344     344   }\Rob   \pgfplotstableread{  Criterion  ddd     ccc     vvv   0      70          75          75    a      70          75          75    b          120         75      75        c      3       34      34  d      3       33      34  e      23      34      34  }\Gab   \begin{document}  \begin{tikzpicture} \begin{groupplot}[group style= {     columns=2,xlabels at=edge bottom,     ylabels at=edge left,     horizontal sep=1cm,group name=plots, }, ymin=0, enlarge x limits={abs=.5}, enlarge y limits={upper,value=0.4},  ylabel=Mon, ylabel style={text height=0.02\textwidth,inner ysep=0pt},  ybar,ybar stacked, major x tick style = transparent,  /pgf/bar shift=0pt, /pgf/bar width=9pt, x tick label style={text height=2ex},    xlabel style={yshift=-2ex},  xticklabels from table={\Rob}{Criterion},  xtick=data,legend columns=-1, legend style={draw=none, /tikz/every even column/.append   style={column sep=5pt}}]  \nextgroupplot[xlabel=Rob, xlabel shift = -7.5cm, legend to name=grouplegend] \pgfplotstableforeachcolumn\Rob\as\col{     \ifnum\pgfplotstablecol=0      \else       \edef\tmp{         \noexpand\addplot table [x expr=\noexpand\coordindex,y=\col] {\noexpand\Rob};         \noexpand\addlegendentry {\col}     }     \tmp     \fi }  \nextgroupplot[xlabel=Gab, xlabel shift = -7.5cm] \pgfplotstableforeachcolumn\Gab\as\col{     \ifnum\pgfplotstablecol=0      \else     \edef\tmp{         \noexpand\addplot table [x expr=\noexpand\coordindex,y=\col] {\noexpand\Gab};     }     \tmp     \fi   }   \end{groupplot}  \draw[dashed] (plots c1r1.south west) -- ++(0,-1.5);   \draw[dashed] (plots c1r1.south east) -- ++(0,-1.5);  \draw[dashed] (plots c2r1.south west) -- ++(0,-1.5);  \draw[dashed] (plots c2r1.south east) -- ++(0,-1.5);  \node at (plots c1r1.south) [inner sep=0pt,anchor=north, yshift=-12ex]     {\ref{grouplegend}};  \end{tikzpicture}  \end{document} Passing world as parameter results nullpointer Why does the light side of the moon appear not to line up correctly with the evening sun? Prove that $d(n)\leq 2\sqrt{n}$ In Waclaw Sierpinski's book Elementary Theory of Numbers on page 168 there is the following exercise:  "Exercises. 1. Prove that for natural numbers $n$ we have $d(n) \leq 2\sqrt{n}$," where $d(n)$ is the number of divisors of n.  As a hint right below is given: "The proof follows from the fact that of two complementary divisors of a natural number $n$ one is always not greater than $\sqrt{n}$.  I understand the hint but I don't know how it can be used to prove $d(n)\leq 2\sqrt{n}$.  Complementary divisors are pairs of divisors that when multiplied gives the number that is to be divided. For example the number $120$ has the complementary divisors: \begin{align*} &amp; 1, 120 \\ &amp; 2, 60 \\ &amp; 3, 40 \\ &amp; 4, 30 \\ &amp; 5, 24 \\ &amp; 6, 20 \\ &amp; 8, 15 \\ &amp; 10, 12 \\ \end{align*} How do you prove that $d(n) \leq 2\sqrt{n}$? Is it possible to show our custom message in QGIS Status bar using python? How do you rename root? Not that it's a very good idea to change it, but for fun. According to  post, there are still some problems even after changing entries in /etc/passwd, /etc/shadow, and /etc/sudoers. Any suggestions? If router is off for a few days, do you have an ip address as far as ISP is concerned? I have an ISP which assigns IP addresses dynamically. If I go out and turn my router off I am always assigned a new one once I turn it back on. Does that mean that...  1) my previous IP goes elsewhere when my router is turned off?  2) i dont actually have an IP address if my router is off for a day or more? I have a Python script that will need to be given to a client.   We are currently evaluating what license level the client will need in order to run the script for their software acquisition purposes.   We all have ArcGIS 10.1 Advanced license in our company.   I checked all the tools and extensions used in the script against the web help and found that they should work on the Standard license level.   Is there a way I can test the script against the Standard license level, when we have no Standard license level in or company (only the higher Advanced level)? Dependence of Friction on Area Is  really independent of area? The friction force, $f_s = \mu_s N$. The equation says that friction only depends on the normal force, which is $ N = W = mg$, and nature of sliding surface, due to $\mu_S$.   Now, less inflated tires experiences more friction compared to well inflated tire. Can someone give clear explanation, why friction does not depend on area, as the textbooks says? How do gas molecules constantly bounce without losing energy? From a related question (), i asked myself this: How do gas molecules constantly bounce off each other without losing energy?  If you drop a ball, it bounces a bunch of times, but the height of each bounce gets shorter and shorter. Because it loses energy in each bounce.  So I don't see how a pressurized gas doesn't lose energy. As I understand it, pressure is a manifestation of lots of molecules bouncing off each other. So over time, shouldn't the pressure drop as the molecules lose speed? and eventually all the molecules will settle in a pile on the floor.  I think another way to phrase this is, how do elastic collisions not lose any energy in the exchange? My understanding of the 2nd law of thermodynamics is that some energy is always "lost" when it's converted from one form to another, or transferred from one object to another. I.e., no transfer/conversion of energy is ever 100% efficient. PCA on correlation or covariance?