What should I learn to become a web design expert? I am from engineering background
Tips and resources for beginning designers
How to make a LAMP server accessible from the internet? Hi I want to make my own SNS (Social Networking Site), so I installed LAMP on my Ubuntu 14.04. But its not accessible from the internet! I can run the server only on my computer by typing "https:\localhost" on my browser.  I don't want any domains; I just want that whosoever from any part of the world wants to use my SNS he/she just have to type the ip-address and my SNS opens i.e. I want my server accessible from the internet.  My router is Binatone DT 850W. Can you please tell me what should I do? I'm fairly certain this has happened to all of us at some point: You go into a room to get something, but once you're there, you can't remember what you intended to get. It seems like a specific, common phenomenon like this must have a name, but I can't think of it. Does anyone know a name (either formal or slang) for this?  I don't want a general term like forgetfulness or absent-mindedness, which could apply to all sorts of forgetting, or a term for not being able to remember a certain word. I'm looking for a word or phrase that describes this one specific situation of forgetting what you need to get as soon as you go to get it. Is it possible to mount a virtual hard disk (VHD, HDD, VDI, VMDK) on Ubuntu? How can this be done? How can one expand the function $f_1(x) = x$ on $(−π, π)$in terms of the functions $\cos nx, n = 0, 1, 2, ...$ and $\sin nx, n = 1, 2, ...,$ in a way so that $$f_2(x) = a_0 + \sum_{n=1}^{\infty}(a_n \cos nx + b_n \sin nx)$$ is the expansion of the $f_1$, how is that? I have asked  related to the same issue but didn't get full answer, I have been told that this is a standard application of Fourier series, $f_1$ and $f_2$ are equivalent in the sense that $f_1(x)=f_2(x)$ for all $x∈(−π,π)$. For any $x$ in this interval, the Fourier series will converge to $f(x)$, but I didn't get any rigorous proof  with elaborate explanation. So, plz provide rigorous proof of $f_1=f_2$ with elaborate explanation as I am new to the subject. Thanks You. I have attached the excerpt below - How does a credit card company make any money off of me using their card if there are no fees associated with the card (I don't pay any extra) and I pay off my balance on time every month (so I don't pay any fees ever for this either).  Are they just banking on the fact that many people don't do this and end up owing them money? I am interested in calculating area under the curve (AUC), or the c-statistic, by hand for a binary logistic regression model.  For example, in the validation dataset, I have the true value for the dependent variable, retention (1 = retained; 0 = not retained), as well as a predicted retention status for each observation generated by my regression analysis using a model that was built using the training set (this will range from 0 to 1).  My initial thoughts were to identify the "correct" number of model classifications and simply divide the number of "correct" observations by the number of total observations to calculate the c-statistic. By "correct", if the true retention status of an observation = 1 and the predicted retention status is > 0.5 then that is a "correct" classification. Additionally, if the true retention status of an observation = 0 and the predicted retention status is &lt; 0.5 then that is also a "correct" classification. I assume a "tie" would occur when the predicted value = 0.5, but that phenomenon does not occur in my validation dataset. On the other hand, "incorrect" classifications would be if the true retention status of an observation = 1 and the predicted retention status is &lt; 0.5 or if the true retention status for an outcome = 0 and the predicted retention status is > 0.5. I am aware of TP, FP, FN, TN, but not aware of how to calculate the c-statistic given this information. Do I need to license fonts included with my OS? Glossaries: Make a glossary entry recognizable in printing How do you make it visible to the reader that the printed word/term is an entry in the glossary? In my PDF on the computer, I just see it because I use the hyperref package and there's a red box around it. But when printing it, there's just nothing that makes it visible to the user.  Is there a typographically good and common way of doing this? Show that $\prod (1- P(A_n))=0$ iff $\sum P(A_n) = \infty$ Prove convergence of the sequence $(z_1+z_2+\cdots + z_n)/n$ of Cesaro means Developing Unit Tests While Refactoring Legacy Code? Failed to fetch jessie backports repository I'm using a docker image as a base for my own development that adds the jessie backports repository in its Dockerfile and uses that to install a dependency. This image uses the following command to add the repository:  echo "deb http://ftp.debian.org/debian jessie-backports main" &gt;&gt; /etc/apt/sources.list   The problem is that fetching packages from the backports repository now  fails with the following error (this used to work previously):  W: Failed to fetch http://ftp.debian.org/debian/dists/jessie-backports/main/binary-amd64/Packages 404  Not Found  W: Failed to fetch http://deb.debian.org/debian/dists/jessie-updates/main/binary-amd64/Packages  404  Not Found   I looked on that server, and those paths are indeed not present there.  I tried to figure out on the Debian backports site whether this particular repository should still be available, and I didn't find any indication that this was deprecated or something like that.  Is this a temporary issue with the repository, or is the jessie-backports repository not available anymore? And if this is not a temporary issue, what options do I have to use this or an equivalent repository without upgrading to the newer Debian stable version? In drupal 7 you can do this to load an entity revision using  ($entity_type, $ids = FALSE, $conditions = array(), $reset = FALSE)  like this:  $old_revision = entity_load('node', array(), array('vid' =&gt; 123));   However now $conditions is being deprecated. Pretty much wherever you go you see people saying that you should use  instead of conditions, however that doesn't help in this case. You can use  to query revisions using EntityFieldQuery however it doesn't give you fully loaded node results so you then still have to load the entity and how do you load that revision of that entity without the conditions. This question is the converse to:    In Overleaf LaTeX Editor, if you type some markup that the autocomplete does not recognise, it gets added to the autocomplete. 99% of the time this is great.  However, if you mistype something, such as \bodl instead of \bold, you will forever have \bodl come up as the first suggestion when inputting \bo...!   As the length of the document increases, and the number of typos goes up, the number of incorrect suggestions quickly starts to outweigh the benefit of the autocomplete, which is a real shame.  How can I remove these typos from the autocomplete? Showing that $\displaystyle\lim_{s \to{1+}}{(s-1)\zeta(s)}=1$ I need prove the following: ($\zeta(s)$ is the Riemann zeta function)  $\displaystyle\lim_{s \to{1+}}{(s-1)\zeta(s)}=1$  I really don't know, I have tried hard, but have obtained nothing for now. Creating polygons from points in Mapinfo The   echo one; echo two &gt; &gt;(cat); echo three;    command gives unexpected output.  I read this:  and many other articles about process substitution on the internet, but don't understand why it behaves this way.  Expected output:  one two three   Real output:  prompt$ echo one; echo two &gt; &gt;(cat); echo three; one three prompt$ two   Also, this two commands should be equivalent from my point of view, but they don't:  ##### first command - the pipe is used. prompt$ seq 1 5 | cat 1 2 3 4 5 ##### second command - the process substitution and redirection are used. prompt$ seq 1 5 &gt; &gt;(cat) prompt$ 1 2 3 4 5   Why I think, they should be the same? Because, both connects the seq output to the cat input through the anonymous pipe - .  Question: Why it behaves this way? Where is my error? The comprehensive answer is desired (with explanation of how the bash does it under the hood). How can I install Steam? Change folder permissions and ownership Volume of the solid generated by revolving the region R enclosed by the curve - Disk and Shell method Find the volume of the solid generated by revolving the region $R$ enclosed by the curve $y=x^3$, the $x$-axis and the line $x=1$.  (About the line $y=1$ using the disk and shell method.)