Just restarted my computer and this happens, tried switching desktop managers and the same thing. Help?
When I login, nothing happens.   I am presented with my desktop wallpaper.    No Dash, no Launcher, nothing.
We know that the trace of a matrix is a linear map for all square matrices and that $\operatorname{trace}(AB)=\operatorname{trace}(BA)$ when the multiplication makes sense.   On the , under properties, it says that these properties characterize the trace completely in the following sense: If $f$ is a linear function on the space of square matrices satisfying $f(xy)=f(yx)$, then $f$ and $\operatorname{tr}$ are proportional. A  of the page gives the justification, but I do not understand the logic of it. Thanks See question when answering Column line overshooting the horizontal line in table \begin{tabular}{|m{3.5cm}|m{5.5cm}|m{4.5cm}|} \hline \emph{Category of Benefits} &amp; \emph{General Benefit} &amp; \emph{Operational Advantages} \\ \hline \multirow{3}{*}{\pbox{3.5cm}{Robust operational performance}} &amp; \multirow{3}{*}{\pbox{5.5cm}{One sensor can contribute information while other are unavailable, denied(jammed), or lack coverage of a target or event}} &amp; -Allows continued operation despite jamming \\ &amp;  &amp; -Graceful degradation \\ &amp;  &amp; -Increased probability of detection \\ \hline  \multirow{2}{*}{\pbox{3.5cm}{Extended spatial coverage}} &amp; \multirow{2}{*}{\pbox{5.5cm}{One sensor can look where another cannot}} &amp; -Increased survivability \\ &amp;  &amp; -Probability of detection increased  \\ \hline \label{tab1.1} \end{tabular}   For the LateX code mentioned above the table which comes looks like this ![enter image description here][1]   In the resulting table, column 1 vertical line overshoots the last horizontal line.  What is the problem? Using R, I have fitted a linear model for a single response variable from a mix of continuous and discrete predictors. This is uber-basic, but I'm having trouble grasping how a coefficient for a discrete factor works.   Concept: Obviously, the coefficient of the continuous variable 'x' is applied in the form y = coefx(varx) + intercept but how does that work for a factor z if the factor is non-numeric? y = coefx(varx) + coefz(factorz???) + intercept   Specific: I have fitted a model in R as lm(log(c) ~ log(d) + h + a + f + h:a) where h and f are discrete, non-numeric factors. The coefficients are:  Coefficients:               Estimate  (Intercept)  -0.679695  log(d)        1.791294  h1            0.870735   h2           -0.447570   h3            0.542033    a             0.037362   f1           -0.588362   f2            0.816825  f3            0.534440 h1:a         -0.085658 h2:a         -0.034970  h3:a         -0.040637   How do I use these to create the predictive equation:  log(c) =  1.791294(log(d)) + 0.037362(a) + h??? + f???? + h:a???? + -0.679695   Or am I doing it wrong?   I THINK that that concept is if the subject falls in category h1 and f2, the equation becomes:   log(c) =  1.791294(log(d)) + 0.037362(a) +  0.870735  + 0.816825  + h:a???? + -0.679695   But I'm really not clear on how the h:a interactive term gets parsed. Thanks for going easy on me. Dual VGA Cards Intel/ Nvidia This is my first post in this forum. I am new to Linux, just installed Ubuntu 11.10 on my Sony Vaio VGN-Z12 with two graphic cards Intel and NVidia Geforce 9300 GS.  After the installation the lightdm works on Intel card but with very law display quality. I installed Nvidia driver from the official website as well as this PPA.  sudo apt-add-repository ppa:ubuntu-x-swat/x-updates sudo apt-get update sudo apt-get install nvidia-current       Once I installed the driver and run nvidia-xconfig which creates xorg.conf file, the xserver will not start with error "no screen". If I delete the xorg.conf file then I am able to start the xserver normally but with intel display (bad quality) double r = 11.631; double theta = 21.4;   In the debugger, these are shown as 11.631000000000000 and 21.399999618530273.  How can I avoid this? This weekend is a "Supermoon" (the largest full moon of the year, in perigee, the closest to Earth). Would someone please advise how I could make the most out of my Canon PowerShot to photograph this phenomenon?    What settings should I use?    What times are the best with respect to the exact times of moonrise and moonset provided by the U.S. Naval Observatory? In other words, is it better 30 min before it crosses the horizon? Or just at the crossing? Are there any tips and tricks for a beginner to benefit from?  Are moonrises or moonsets generally better/easier to capture? Are there different techniques for different phases of the moon?   I read that full moon tends to come out flat, but I also want to benefit from the perigee. Change the font of figure captions I would like to italicize my figure captions and make them smaller.  How can I do that? how to loop through arguments in a bash script What is the purpose of .bashrc and how does it work? Defrosting meat/fish in warm water I have found warm water to be a great way to quickly defrost meat and fish as opposed to just letting it sit outside the freezer, which is what my mom does.  But I wonder if there are any negative side effects to the method, as in, for example, compromised taste or compromised food safety.  I do understand that the water shouldn't be too hot as to avoid actually cooking the frozen food. Why does .NET use banker's rounding as default? According to the documentation, the  method uses a round-to-even algorithm which is not common for most applications. So I always end up writing a custom function to do the more natural round-half-up algorithm:  public static decimal RoundHalfUp(this decimal d, int decimals) {     if (decimals &lt; 0)     {         throw new ArgumentException("The decimals must be non-negative",              "decimals");     }      decimal multiplier = (decimal)Math.Pow(10, decimals);     decimal number = d * multiplier;      if (decimal.Truncate(number) &lt; number)     {         number += 0.5m;     }     return decimal.Round(number) / multiplier; }   Does anybody know the reason behind this framework design decision?  Is there any built-in implementation of the round-half-up algorithm into the framework? Or maybe some unmanaged Windows API?  It could be misleading for beginners that simply write decimal.Round(2.5m, 0) expecting 3 as a result but getting 2 instead. Meta sites in "Your Communities" display different reputation How to compute prediction bands for non-linear regression? I don't see the gear button next to the Sign in button at the login screen. I have Nvidia drivers installed (for Nvidia 730 GT card). Ubuntu boots into Xorg as seen from the terminal with echo $XDG_SESSION_TYPE which outputs x11.  How do I switch to Wayland? Cubic polynomial with three (distinct) irrational roots I am looking for an equation     $$x^3+ax^2+bx+c=0, \qquad a, b, c \in \Bbb Z,$$   of degree $3$ that has $3$ different roots.  For an equation of degree $2$ it is easy---for example $x^2-2=0$---but I can't find an example for degree $3$.  if there is a method for finding this kind of Equation I will be grateful. Does Google use the Meta Description Tag for Description of Page? When you do a Google search, there is typically a snippet of sample content from the page. I seem to recall that the Meta Tags can influence this choice of descriptive sentences. Is that correct(?) and if so, is it the Meta Description Tag?  Also, how many characters is Google's descriptive sentences limited to? Content Type field on NewForm.aspx I have a custom list and I am using content types to add items to the list. I am using OOTB forms for new and edit items. One field that I see on the EditForm.aspx is the one that I hope I get on the NewForm.aspx also and it is the Content Type field. It is shown in the following screenshot. Do you know how to add that field on the NewForm.aspx page also?    Thanks. How can I use a variable in the replacement side of the Perl substitution operator? I would like to do the following: $find = &quot;start (.*) end&quot;; $replace = &quot;foo \1 bar&quot;;  $var = &quot;start middle end&quot;; $var =~ s/$find/$replace/;  I would expect $var to contain &quot;foo middle bar&quot;, but it does not work. Neither does: $replace = 'foo \1 bar';  Somehow I am missing something regarding the escaping. Say there are $m+n$ elements split into two groups ($m$ and $n$). The variance of the first group is $\sigma_m^2$ and the variance of the second group is $\sigma^2_n$. The elements themselves are assumed to be unknown but I know the means $\mu_m$ and $\mu_n$.  Is there a way to calculate the combined variance $\sigma^2_{(m+n)}$?   The variance doesn't have to be unbiased so denominator is $(m+n)$ and not $(m+n-1)$.