Table of contents including some "hand-made" entries
Create an entry in index without creating a Chapter or Section title
What does it mean to instantiate a trait? How were hobbits created? How were hobbits created? I can't find any reference in The Silmarillion about this. Are they just men who have shrunken over generations or what? How do the likely/unlikely macros in the Linux kernel work and what is their benefit? How are cellphone IP addresses assigned? How to launch the default (native) application for a given file from Java? From yesterday, openweather extention on the top panel does not show the weather. Its shows "Please wait Loading".  I tried to find the solution. There was a post of creating account on openweather website and use API id. I found that it is a subscription base plan. There was a free plan which allows 60 calls free for weather data.  I thought that the extention is open source. And may be I deleted any package that is required to work the extention so I reinstall the OS. But there is no difference of doing that.    What could possibly go wrong any guidance? grep: memory exhausted Coordinate descent soft-thresholding update operator for LASSO I was reading this paper () describing the coordinate descent algorithm for LASSO, and I can't quite figure out how the soft-thresholding update for each $\beta_j$ is derived for the linear regression case. Specifically, how does one go from equation (4) to equation (5) in the paper? Can anyone show me a detailed derivation of the update? Thanks!  Edit: actually this paper deals with the elastic net penalizing term, which reduces to LASSO when $\alpha=1$. I am mostly interested in LASSO, but I guess the derivation should be principally the same for elastic net. How can I move my /home directory to another partition if it's already part of the / partition? I have a generic class in my project with derived classes.  public class GenericClass&lt;T&gt; : GenericInterface&lt;T&gt; { }  public class Test : GenericClass&lt;SomeType&gt; { }   Is there any way to find out if a Type object is derived from GenericClass?  t.IsSubclassOf(typeof(GenericClass&lt;&gt;))   does not work. How can I extract a predetermined range of lines from a text file on Unix? Is it possible to extend a tourist Schengen visa (12 more days)? Here is a question that's been bothering me since I was a sophomore in university, and should have probably asked before graduating:  In analytic (Lagrangian) mechanics, the derivation of the Euler-Lagrange equations from the principle of least action assumes that the start and end coordinates at the initial and final times are known. As a consequence, any variation on the physical path must vanish at its boundaries. This conveniently cancels out the contributions of the boundary terms after integration by parts, and setting the requirement for minimal action, we obtain the E.L. equations.  This is all nice and dandy, but our intention is finding the location of a particle at a time in the future, which we do not know a priori; after we derive any equations of motion for a system, we solve them by applying initial values instead of boundary conditions.   How are these two approaches consistent? How can I install WhatsApp in Ubuntu? Related: some \newcommand instructions not working 8.4 - Use entity browser in a module block from in same way as I would in a custom block grep a file, but show several surrounding lines? Strange, unexpected behavior (disappearing/changing values) when using Hash default value, e.g. Hash.new([]) What does "Suit yourself" mean? Enter from password field doesn't submit SE login form On  page for a site where I don't yet have an account, if I select the "Log in using Stack Exchange" box, when I hit enter from the password form, nothing happens.  Minor, but...