Can students transfer from one school of witchcraft and wizardry to another?    I am aware that there are  and I'm aware of the fact that they enroll students based on their geographical range, as well as the decision made by The Educational Office of the International Confederation of Wizards, when it comes to foreign and overseas students.  But what if one student, who was learning in Hogwarts, decides to move to Durmstrang Institute? Is this allowed by the Ministry? Or is there a syllabus difference that makes transfers cumbersome?
Are there either examples, or a mention of this having happened, of students permanently transferring from one magical school to another in Potterverse?  Canon only please (books/JKR/Pottermore).  Please note that I am only asking about transfers, e.g. you must already be studying in one school. Therefore an example of Malfoys considering sending Draco to Durmstrang is not in scope, since that happened before he attended Hogwarts. Also, guest-studying during Tri-Wizard doesn't count as it wasn't permanent.  Also, if the answer is a "no", please provide evidence (other than "well I read the books before and I don't remember a single case like that", unless you have eidetic memory) from entire canon.
How do I escape the wildcard/asterisk character in bash? For example:  me$ FOO="BAR * BAR" me$ echo $FOO BAR file1 file2 file3 file4 BAR   and using the \ escape character:  me$ FOO="BAR \* BAR" me$ echo $FOO BAR \* BAR   I'm obviously doing something stupid.  How do I get the output BAR * BAR? How do the PHP equality (== double equals) and identity (=== triple equals) comparison operators differ? Find the area of the shaded region in the figure below: Find the area of the shaded region in the figure below:    I am completely stuck on how to start off this question. Please help on some guidance on how to start it off. Question mark or period to end a rhetorical sentence Which makes more sense as end punctuation for the following rhetorical sentence—a period or a question mark?     Maybe you could be a security guard there and enforce whatever the WalMart policy is at that location Removing control chars (including console codes / colours) from script output Inequality $(1+\frac1k)^k \leq 3$ $$A=\begin{array}{ccc} 0 &amp; 1/2 &amp; 0 &amp; \cdots &amp; 0 \\ 1/2 &amp; 0 &amp; 1/2 &amp;\cdots&amp; 0\\ 0 &amp; 1/2 &amp; 0 &amp; \cdots &amp; 0\\ \vdots &amp; \vdots &amp; \vdots &amp;\ddots &amp; 1/2\\ 0 &amp; 0 &amp; 0 &amp; 1/2 &amp; 0 \end{array}$$  I need to know the spectral radius of $A$ in function of the dimension of the matrix $n$. I know only one way to know the spectral radius, using the definition I find all eigenvalues and then find the maximum. but it very hard if $n$ is changing. Some help please!  I did some iteration by   $$det(\lambda I-A)$$  $$n=2 \quad r=\frac{\sqrt{1}}{2}$$ $$n=3 \quad r=\frac{\sqrt{2}}{2}$$  for $n=2$ and $n=3$ are correct.  and if we take this rule, for   $$n=5\quad \quad r=\frac{\sqrt{4}}{2}$$  but this isn´t true since I know radius for this matrix should be $&lt; 1$ and if we take this rule  for $n=5$ we have  $$\frac{\sqrt4}{2}=1$$   Some hint? I would say $\infty - \infty=0$ because even though $\infty$ is an undetermined number, $\infty = \infty$. So $\infty-\infty=0$. How to convert a std::string to const char* or char*? My father wrote some papers on cosmology that remained unpublished at the time of his death.  I have been looking for a publisher for them. I contacted IOP publishing but they said that, while Dad’s writings were interesting, they were not ready for publishing in any of their journals. For example, they need a reference list citing other current published research on the same topic.  I am not a scientist and have no idea how to do this. Where can I get help with this? Would something like  be a good idea? How to redirect with "www" URL's to without "www" URL's or vice-versa? I am using ASP.NET 2.0 C#. I want to redirect all request for my web app with "www" to without "www"  www.example.com to example.com  Or  example.com to www.example.com  Stackoverflow.com is already doing this, I know there is a premade mechanism in PHP (.htaccess) file. But how to do it in asp.net ?  Thanks How is Anti Aliasing Implemented in Ray Tracing? After reading a few articles online I can confidently say I am clueless on how Anti-Aliasing works when using Ray Tracing.  All I understand is that A Single Pixel/Ray is split into 4 sub-pixels and 4 rays rather than 1.  Could somebody please explain how this is done (preferably with code)? What happens if you use the 32-bit int 0x80 Linux ABI in 64-bit code? How to get speech output from entered text by using command-line?  Also facility to change speech rate, pitch, volume etc using simple command. Why do electrons move towards anode in the Photoelectric effect experiment? Consider a Photoelectric effect experiment apparatus as shown in Figure 11.1    The variation of photocurrent with the voltage applied across $\mathrm{A}$ and $\mathrm{C}$ is as shown in Figure 11.3.    My question –     Why is the current non-zero even if the voltage is zero?    Consider a situation in which the voltage across the plates is zero. Photons of sufficient frequency strike the outermost surface of the cathode, emitter plate $\mathrm{C}$. Electrons become free from the attraction of nucleus as their net energy becomes positive.  Why I think that there should be no net current?  As soon as photons strike the outermost surface of the cathode(assumed to be $1$ to $10$ atomic diameters thick), electrons become free. Now, as the electrons have kinetic energy, they'll come out of that outermost surface. Now, the electrons(with kinetic energy) should have an equal probability of going in every direction of the surface. So, around half of the electrons should go in the right direction towards the anode and strike it and half should go to the left, trying to penetrate the inner surfaces of the cathode plate.   Now, the electrons which will go to the right will face some field due to the space charge present in the tube but nevertheless, some electrons will definitely reach the anode plate. After they strike with the anode plate, they'll face some resistance but still, some electrons will reach the low resistance copper wires connected to the anode plate and milliammeter.  Now, consider the electrons which go towards left. They'll definitely face resistance from cathode plate but some will still reach the copper wire.  Now, as there is no potential difference applied between $\mathrm{A}$ and $\mathrm{C}$, there is no need of commutator and voltmeter. So, the ammeter is connected in series with the anode plates and cathode plates with copper wires.  Now, if there is steady state current in the circuit, electrons emitted to any one of the sides should dominate over the other. But the number of electrons emitted on both the sides is same, and all the electrons should face the same resistance as the current(electrons) should flow in a closed loop. But if the number and velocity of electrons coming from both the sides are same, there should be no net current. But there is. Why?  Edit –  From the answers of anna v and mmainville, it can be seen that the emission of electrons is dependent on the angle of emission of light.  But still, the question remains. If the electrons emitted towards anode have enough energy to complete the circuit and again reach the holes in cathode despite the resistance in between, the electrons emitted to the left should have enough energy to come to anode plate via copper wires and again get ejected through anode plate by the virtue of their kinetic energy and reach the cathode plate. In this case too, the current should be zero which is not true. Why? Let $m$ be a natural number. Define $f(m) = m + \lfloor\sqrt{m}\rfloor$. Prove that at least one of the number among $m, f(m), f^2(m), \ldots$ is a perfect square. Here $f^k(m)$ denotes the composition of $f$ over itself $k$ times.  I tried the question, but the greatest integer along with square root is creating trouble. Cannot set LC_CTYPE to default locale: No such file or directory How to properly establish a PostgreSQL connection using QgsCredentials I'm trying to establish a Postgres connection using QgsCredentials as described here:    The only problem is that I cannot establish a working connection unless I "physically" add the layer to the map canvas (which I don't want because I only want a connection to the DB and a reference to the layer which will be edited later on in the code)  When clicking a button the run function reads:  uri = QgsDataSourceURI() connInfo = uri.connectionInfo()  (success, user, passwd) = QgsCredentials.instance().get(connInfo, None, None)  if success:     # Isn't this enough to establish the connection and get a valid reference to the layer?     uri.setConnection("HOST", "PORT", "DB_NAME", user, passwd)     uri.setDataSource("SCHEMA", "TABLE_NAME", "the_geom")     LYR = QgsVectorLayer(uri.uri(), "LYR", "postgres")      # Unless I add the following line, I am not able to use properly the object     # (which asks the user the credentials until he/she inserts the right ones and gets     # a working connection with a valid reference to the layer)     QgsMapLayerRegistry.instance().addMapLayer(LYR)   What am I doing wrong?  Thanks in advance,  m. How can I search for a keyword with special characters in Google Search? where do I use Database. Methods?