Hello all - many thanks again to people who have kindly offered help (especially to Mark for his outstanding response to my previous question). I would like to plot implicit equations (of the form f(x,y)=g(x,y) eg. x^y=y^x) in Matplotlib. Is this possible? All the best, Geddes ...
I'm not sure how to construct the question but I'm interested to know what do you guys think of the following situations and which one would you prefer. We're working at a client-server application with winforms. And we have a control that has some fields automatically calculated upon filling another field. So we're having a field curre...
Hello - I am working on using Matplotlib to produce plots of implicit equations (eg. y^x=x^y). With many thanks to the help I have already received I have got quite far with it. I have used a contour line to produce the plot. My remaining problem is with formatting the contour line eg width, color and especially zorder, where the contour...
I have the following code: template <class T> struct pointer { operator pointer<const T>() const; }; void f(pointer<const float>); template <typename U> void tf(pointer<const U>); void g() { pointer<float> ptr; f(ptr); tf(ptr); } When I compile the code with gcc 4.3.3 I get a message (aaa.cc:17: error: no matching function...
Why does this code fail to compile, but compiles successfully when I uncomment the indicated line? (I'm using Scala 2.8 nightly). It seems that explicitly calling string2Wrapper allows it to be used implicitly from that point on. class A { import Implicits.string2Wrapper def foo() { //string2Wrapper("A") ==> "B" // <-- uncommen...
Here is my scenario: we have a database, let's call it Logging, with a table that holds records from Log4Net (via MSMQ). The db's recovery mode is set to Simple: we don't care about the transaction logs -- they can roll over. We have a job that uses data from sp_spaceused to determine if we've met a certain size threshold. If the thre...
I have the following code, which uses a Unicode string class from a library that I'm writing: #include <cstdio> #include "ucpp" main() { ustring a = "test"; ustring b = "ing"; ustring c = "- -"; ustring d; d = "cafe\xcc\x81"; printf("%s\n", (a + b + c[1] + d).encode()); } The encode method of the ustring class instances co...
Basically, I want to be able to use string.Split(char[]) without actually defining a char array as a separate variable. I know in other languages you could do like string.split([' ', '\n']); or something like that. How would I do this in C#? ...
I have a method like this: private static double ComputePercentage(ushort level, ushort capacity) { double percentage; if(capacity == 1) percentage = 1; // do calculations... return percentage; } Is it possible to make it of a generic type like "type T" where it can return either decimal or double, dep...
When running the following code, the filenames of all files below C:\Test are printed. Why doesn't it print just Hello (n times, depending on how many files are processed)? Does this imply that I cannot rely on shift to reliably assign to $_? Imagine a coworker implements the wtf function and doesn't know that it's called from a File::...
e.g. When deadlock occurs, following SQL commands are successfully executed, even if they have assigned SQL transaction that is after rollback. It seems, it is caused by a new implicit transaction that is created on SQL Server. Someone could expect that ADO.NET would throw an exception that the commands are being executed on a zombie tr...
Hello, As it is MyClass x = 120;, is it possible to create such a custom class? If so, how can I do that? ...
For example implicitly MyClass myClass = new MyClass(); int i = myClass; ...
So I've started looking at ruby, and a lot of things look nice but I'm quite put off by implicit return statements. I understand making everything return self or nil by default but not the last value of a statement. To me it looks horribly fragile (especially) if you are working with a method that doesn't plan to return something (espec...
I am writing an interpreter and tried to use solution from how-to-set-up-implicit-conversion-to-allow-arithmetic-between-numeric-types for the same problem I need to be able to add Boolean + Boolean, Int + Boolean, Boolean + Int, Int + Double, Double + Double etc. So I used WeakConformance and C classes from that solution sealed trait...
I have an implicit function, for example: f(x,y) = x**y + y**y - 3*x I want to solve the root on a meshgrid. So f(x,y) = 0 Drawing the solution is easy: x = linspace(-2,2,11) y = linspace(-2,2,11) (X,Y) = meshgrid(x,y) A = X**Y + Y**Y - 3*X contour(X,Y,A,0) This works great, I have a drawing of the curve I need, however I would l...
Often there's no need to pay any attention to implicit arguments in Scala, but sometimes it's very helpful to understand how the compiler is automatically providing them. Unfortunately, this understanding seems to be hard to obtain! Is there a general method to discover how an implicit parameter has been provided, in a given piece of...
scala> class A(implicit a: Int); defined class A scala> class B()(implicit a: Int); defined class B scala> new A()(1) res1: A = A@159d450 scala> new B()(1) res2: B = B@171f735 scala> new A(1) <console>:7: error: too many arguments for constructor A: ()(implicit a: Int)A new A(1) Why does Scalac insert an empty parameter list...
I can get the compiler (msvc++ express) to convert "string" as a CustomString in a constructor, but not with a reference. Will it therefore not have the same chance of being optimized out with a pass-by-reference anyway, like passing by value with other types can, if the compiler thinks it can? won't implicit convert using new xmlNode...
There seems to be a lot of enthusiasm among Scala bloggers lately for the type classes pattern, in which a simple class has functionality added to it by an additional class conforming to some trait or pattern. As a vastly oversimplified example, the simple class: case class Wotsit (value: Int) can be adapted to the Foo trait: trait F...