What would be the code for moving onto a new screen after a user presses a key. For example I have coded a blank screen that says press any key to begin.   I have been looking all over the web, but I am unable to find such a code that does not involve jQuery etc.   Thank you in advance.  &lt;script&gt;     //created a variable for instructions        var instructions = '&lt;h1&gt;&lt;center&gt;You will see three different symbols appear&lt;/center&gt;&lt;/h1&gt;';      //Created a button        var button = document.createElement('button');         button.innerHTML = 'Click here to Start';         var body = document.getElementsByTagName('body')[0];         body.appendChild(button);         button.addEventListener('click', function(){         if('click'){             document.open(newPage)         }         });      //Pressing a key (space bar in this case) will open up a blank page with the instructions of the experiment      document.addEventListener('keydown',function(e){     if(e.keyCode==32){          document.location.href=('about:blank');         document.write(instructions) } });  &lt;/script&gt;
How can I redirect the user from one page to another using jQuery or pure JavaScript?
Max dimension of a subspace of singular $n\times n$ matrices I am sure the answer to this is (kind of) well known. I've searched the web and the site for a proof and found nothing, and if this is a duplicate, I'm sorry.  The following question was given in a contest I took part. I had an approach but it didn't solve the problem.     Consider $V$ a linear subspace of the real vector space $\mathcal{M}_n(\Bbb{R})$ ($n\times n$ real entries matrices) such that $V$ contains only singular matrices (i.e matrices with determinant equal to $0$). What is the maximal dimension of $V$?   A quick guess would be $n^2-n$ since if we consider $W$ the set of $n\times n$ real matrices with last line equal to $0$ then this space has dimension $n^2-n$ and it is a linear space of singular matrices.  Now the only thing there is to prove is that if $V$ is a subspace of $\mathcal{M}_n(\Bbb{R})$ of dimension $k &gt; n^2-n$ then $V$ contains a non-singular matrix. The official proof was unsatisfactory for me, because it was a combinatorial one, and seemed to have few things in common with linear algebra. I was hoping for a pure linear algebra proof.  My approach was to search for a permutation matrix in $V$, but I used some 'false theorem' in between, which I am ashamed to post here. Korea: Visa required to go to the city while in transit in Seoul for a Philippine citizen? Clip vector on Geoprocesing QGIS 2.18.13, global name 'features' is not defined I want to clip a vector polygon with a boundary vector polygon but the process is failing. I am getting the error, "global name 'features' is not defined See log for more details". I don't know what is causing this error. How do I change my default browser? Is there an option to change my default browser for all my applications? First of Tablet info :   Model number : Micromax P275  Android version : 4.0.4  Baseband version : v3.0  Kernal version : 3.0.8+ linda@SKYWORTHSERVER3 #52  Fri Sep 21 14:00:53 CST 2012  Build number : P275_HW.V0.1_V3.0_20120921  I dont know anything about android  now the issue is that the screen keeps randomly jerking and there are random touches that happen which will open apps and close apps randomly. this happens after few minutes since  Tablet turn on. When these things happen i cannot do anything. even if i try to power down by pressing the power key the dialog box disappears because of this random behavior.  i observer this behavior mainly when i travel in bus. so i'm thinking that the vibrations are affecting the accelerometer and thus causing the random movements. When i'm in a stationary place i rarely see this issue, but it has occured.  now i disabled  1)Auto rotate  2)Disabled all options in Developer options except Force hardware rendering.  the system update will happen and i cant turn it off(atleast i dont know).  my main useage in the Tablet are 1) pdf reading 2)videos 3)small c programmin(using CCtools).  please help me with this issue. its is very very frustrating. last thing,i brought this device 28 days ago. also i would like links on reinstalling android. Does Blender support dual-GPU rendering if the two GPUs aren't the same? I have a GTX 1060 6GB in my current build, and I also have a GTX 960 2GB in storage. I was wondering if I got , and got both of my GPUs in one build (not SLI or CrossFire, just in the same system) would I be able to use both GPUs for rendering simultaneously? I don't care if this means having them both render separate tiles in one instance of Blender, or rendering separate frames in two instances. I'm using Cycles for everything I do. Solution for A/C Condensate Drain Line that doesn't require emptying a bucket of water every day? Answering beyond the question's scope Is answering beyond the scope of the question a valid thing? Or should we just stick to the question asked and ignore any potential bugs which might be present (of course OP is unaware of that, as of now).  To make myself more clear, please have a look at this .  There are 3 answers which talk about the issue asked and that's it. If you look at my answer, I've added an additional point about a potential bug which the OP has missed now (may find out later). So is it a good thing to point out such potential bugs or not? Should this practice be encouraged? Why are date-based hats awarded too early? How to check a particular directory is mounted on the Linux machine. For instance there is a folder named test, I want to check if it is mounted or not. I am new to Ubuntu and Linux in general.  I created a dual boot OS on my laptop (Windows 10 and Ubuntu).    Typing: sudo apt-get install python3-tk (or even python-tk) didn't work. Trying to install the python3-dev or python-devel (no luck). Downloading Tcl and Tk to manually install.   In Windows 10 Bash Subsystem the Tk and Tcl are already included, so I thought Ubuntu already had it.  But, I want to use my Ubuntu desktop to develop Python GUI apps.   So, how can I install the Tcl/Tk to be use in Python 3.5 for GUI development?   I loaded Python 3.5.2 fine but need the GUI modules enabled.  The code to test that Tk is working is:      Type python3    Type:     import tkinter    tkinter._test()  Result: a GUI pop-up displaying This is a Tcl/Tk version.. Clojure - Side Effects Happening Out Of Order While dabbling in Clojure I've written a very basic program to echo whatever the user types into it. However, it doesn't run in a way that I'm perceiving to be natural. Here's the code:  (defn goo []   (print "echo&gt; ")   (def resp (read-line))   (print resp) )   I would expect the code to run like this (for me typing in foo as the input to read-line):  user=&gt; (goo) echo&gt; foo foonil   But instead, the echo and read-line is switched:  user=&gt; (goo) foo echo&gt; foonil   Why does this happen? Is there a subtlety I'm missing?  EDIT: From Joe's answer, the updated correct solution is:  (defn goo []   (print "echo&gt; ")   (flush)   (def resp (read-line))   (print resp)   (flush) )   Also, the flushes aren't necessary if you use println instead of print. . (See comments to the question: the OP tried to include a couple of long XML files, but that wasn't possible.)  What's the recommended approach to including code/data, when there's just too much of it to embed in the question?  I could think of a few approaches myself:   Paste the data to a pastebin and link (and wait for the links to die) Encode the (compressed) data in an image and include that (kludgy!) Implement an attachment feature in Stack&nbsp;Overflow (which will probably be abused) Why cant we replace diode connected BJTs by simple diodes in a current mirror circuit? What is the difference between “do” and “make”? Why do we age? or Do we have a theory of senescence? There seem to be a number of ideas about why we age. Hypotheses include the gradual accumulation of cell metabolic products affecting organism function and the reduction of  during cell division. My hand-wavey idea would be "wear and tear".  Are we anywhere near a consensus theory of senescence? What is the difference between topological and metric spaces? What is the difference between a topological and a metric space? What is the preferred way to find focused control in WinForms app? Our 3 months old baby is very keen on rolling over and being on his stomach. Most of the time he automatically rolls over in a few minutes after we put him on his back, including during bed time. Is this dangerous? We are particularly worried that   his nose maybe blocked when facing down it is said that SIDS risk increases when a baby sleeps on his stomach   If it is dangerous, how can we stop this, especially during bed time or other times when we can't watch him continuously? Optional Android notifications for reputation changes I would like to get a notification if my reputation count has changed. I think there is already some internal API for that. (I can see that changes in the menu bar in the top).  I'm sure that some people would not like that so that should be optional.