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  • C++ typedef for partial templates

    - by Gokul
    Hi, i need to do a typedef like this. template< class A, class B, class C > class X { }; template< class B, class C > typedef X< std::vector<B>, B, C > Y; I just found that it is not supported in C++. Can someone advise me on how to achieve the same through alternative means? Thanks, Gokul.

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  • Which motherboard for Intel i7 and how to get RAID working?

    - by jasondavis
    I am wanting to build a new PC, I have a couple questions. 1) I am wanting to go with the Intel Core i7 920 Processor, can anyone reccomend a good reliable motherboard for this processor? Graphics card support does not matter (sli-crossfire). I would like to support a lot of ram, so the more ram slots the better. I have read so many bad reviews about certain boards not working good, I would love recommendation from experience. 2) I am wanting to run a couple SSD drives in RAID-0, I have never done this, will I need to purchase anything additional to the MB and CPU and drives to get raid working?

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  • Qt "no matching function for call"

    - by Blin
    I have no matching function for call to 'saveLine::saveLine()' error when compiling my application. The construcor is never actually called. saveLine class definition: class saveLine { public: saveLine(QWidget *parent); private: QPushButton *selectButton, *acceptButton; QLabel *filePath; QLineEdit *allias; }; saveLine is used in another class which is defined as follows: class MWindow : public QWidget { Q_OBJECT public: MWindow(QWidget *parent=0); private: saveLine line1; }; error points to MWindow constructor implementation MWindow::MWindow(QWidget *parent):QWidget(parent) { this->setWindowTitle("Launcher"); this->resize(600,600); } What should i do? I intend to use saveLine class in a vector, to create lines at runtime.

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  • allocator with no template

    - by Merni
    Every stl container take an allocator as a second object, template < class T, class Allocator = allocator<T> > class vector; If you write your own class It is possible to use your own allocator. But is it possible to write your own allocator without using templates? For example, writing this function is not easy if you are not allowed to use templates pointer allocate(size_type n, const_pointer = 0) { void* p = std::malloc(n * sizeof(T)); if (!p) throw std::bad_alloc(); return static_cast<pointer>(p); } Because how could you know the size of T?

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  • [MATH]Project an axis to a plane

    - by Robert
    how do i project the X axis to a plane if the plane is defined by three points? see pic here: http://129.25.16.135:2080/v6.5/books/usb/graphics/iconventions-local-surfaces.png The default local 1-direction is the projection of the global x-axis onto the surface. If the global x-axis is within 0.1° of being normal to the surface, the local 1-direction is the projection of the global z-axis onto the surface. let's suppose that these points are: t1 = [-0.362879991531372, 0.357021987438202, -0.373737007379532] t2 = [-0.383525013923645, 0.371621012687683, -0.383549988269806] t3 = [-0.383534014225006, 0.34629300236702, -0.38544899225235] is the vector [0.78280971952246, -0.0307519963686645, 0.411184845614438] correct answer in this case? i've calculated the angle between the surf and x (1,0,0) is ~28°. and can you give the entire procedure for the calculation, because i'm just puzzled.

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  • Javascript function returning number with two decimals...?

    - by muzzledBYbrass
    I have a function to return points along a line and my return comes back with two decimal points...? For example, a return of my variable px will be something like -88.4029.032940598. vx is the x vector and mult is the distance of the line plus distance to calculate the point. Here is the operation that is returning these values: var mult = parseFloat(mag + theUnit); var px = coord_one.x_point + (vx * mult); console.log(px); Never have seen this before- I appreciate any and all help!

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  • IN r, how to combine the summary together

    - by alex
    say i have 5 summary for 5 sets of data. how can i get those number out or combine the summary in to 1 rather than 5 V1 V2 V3 V4 Min. : 670.2 Min. : 682.3 Min. : 690.7 Min. : 637.6 1st Qu.: 739.9 1st Qu.: 737.2 1st Qu.: 707.7 1st Qu.: 690.7 Median : 838.6 Median : 798.6 Median : 748.3 Median : 748.3 Mean : 886.7 Mean : 871.0 Mean : 869.6 Mean : 865.4 3rd Qu.:1076.8 3rd Qu.:1027.6 3rd Qu.:1070.0 3rd Qu.: 960.8 Max. :1107.8 Max. :1109.3 Max. :1131.3 Max. :1289.6 V5 Min. : 637.6 1st Qu.: 690.7 Median : 748.3 Mean : 924.3 3rd Qu.: 960.8 Max. :1584.3 how can i have 1 table looks like v1 v2 v3 v4 v5 Min. : 1st Qu.: Median : Mean : 3rd Qu.: Max. : or how to save those number as vector so i can use matrix to generate a table

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  • Need recommendation for object serialization library in c++

    - by michael
    Hi, I am looking for recommendation for object serialization/deserialization library in c++? Which one are the most advanced and open-sourced? Can it handle Any class that users defined? Object hierarchy (parent and child classes)? A Tree of objects? Class A has an attribute of Class B which has an attribute of Class C? STL containers? Class A has a vector of Class B? A cyclic of objects? Class A has a pointer pointing to B which has a pointer to A? I find boost serialization library. I am not sure what is its limitation from http://www.boost.org/doc/libs/1_42_0/libs/serialization/doc/tutorial.html

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  • won't repaint a different Month after pressing button in my calendar

    - by DarkStar123
    I'm trying to build a Calendar in Java as a little project I thought of, But I can't seem to change the name of the Month every time I click the Next button. here's my code! package drawing; import javax.swing.*; import java.awt.*; import java.awt.event.*; public class Drawing_something extends JPanel{ int[] calender_squares = {1, 2, 3, 4, 5, 6, 7}; String[] Month = {"January", "February", "March", "April","May","June","July", "August","September","October","November","December"}; int i = 0; Graphics c; @Override public void paintComponent(Graphics c){ super.paintComponent(c); this.setBackground(Color.WHITE); int WIDTH = 55, HEIGHT = 65; for (int in: calender_squares) { for (int counter = 0; counter < 7; counter++){ c.drawRect(50, 50, 100, 100); c.drawRect(50, 50, 700, 500); c.copyArea(50, 50, 600, 500, 100, 0); c.copyArea(50, 50, 600, 400, 0, 100); } } for (int date = 1; date <= 30; date++) { String s = String.valueOf(date); c.drawString(s, WIDTH, HEIGHT); if (date <= 6){ WIDTH += 100; } else if (date == 7){ WIDTH = 55; HEIGHT = 165; }else if (date <= 13){ WIDTH += 100; }else if (date == 14){ WIDTH = 55; HEIGHT = 265; }else if (date <= 20){ WIDTH += 100; }else if (date == 21){ WIDTH = 55; HEIGHT = 365; }else if (date <= 27){ WIDTH += 100; }else if (date == 28){ WIDTH = 55; HEIGHT = 465; }else if (date <= 30){ WIDTH += 100; } } c.setFont(new Font("default", Font.BOLD, 40)); c.drawString(Month[i], 320, 45); } public Drawing_something(){ setLayout(new BorderLayout()); JButton N = new JButton("NEXT"); JButton B = new JButton("BACK"); JPanel P = new JPanel(); P.add(B); P.add(N); add(P, BorderLayout.SOUTH); B.addActionListener(new HandlerClass()); N.addActionListener(new NextClass()); } public class HandlerClass implements ActionListener{ public void actionPerformed(ActionEvent e){ } } public class NextClass implements ActionListener{ public void actionPerformed(ActionEvent e){ if (i == 11){ i = 0; } i = i + 1; c.drawString(Month[i], 320, 45); } } public static void main(String[] args){ JFrame mainFrame = new JFrame("Calender"); mainFrame.add(new Drawing_something()); mainFrame.setSize(850, 650); mainFrame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE); mainFrame.setVisible(true); } } if anyone could help that would be much appreciated!! Thanks in advance!!

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  • Filtering spectrum using FIR filters

    - by Alex Hoppus
    If i have signal values x[T] and filter coefficients b[i], i can perform filtering using convolution. Suppose i have spectrum of x (after FFT) and i need to perform filtering using filters coefficients, how can i perform this? I heard that in frequency domain it will be multiplying, rather than convolution (time domain). But i can't find an equation to use it. I have 614000 values in y = fft(x[T]) vector and 119 filter coefficients (generated using fdatool), i can't multiply them directly ... Thanks.

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  • Strange calculation problem in C multiply by 1.2 fails

    - by DoomStone
    I have this c code, where i need to calculate a dobule from a long. double result; long t2_value; t2_value = 72; result = t2_value * 1.2; Now this code crashes at "result = t2_value * 1.2;" only with the error "Vector 0000000006". Here is the strange thing, if i replace result = t2_value * 1.2; with result = 72 * 1.2; evything works just as it should, i have tryed type casting t2_value as an double result = ((double)t2_value * 1.2); or making it an int istead of a long, but nothing helps.

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  • Can I use MFC objects in STL containers?

    - by Jesse Stimpson
    The following code doesn't compile for me in MSVC2005: std::vector<CMenu> vec(10); CMenu is an MFC menu object (such as a context menu). Through some testing I learned that CMenu does not have a public copy constructor. To do what I wanted to do, I needed to use a dynamic array. CMenu* menus = new CMenu[10]; // ... delete [] menus; Of course, now I've lost all the benefits of using an STL container. Do I have any other options?

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  • algorithms that destruct and copy_construct

    - by FredOverflow
    I am currently building my own toy vector for fun, and I was wondering if there is something like the following in the current or next standard or in Boost? template<class T> void destruct(T* begin, T* end) { while (begin != end) { begin -> ~T(); ++begin; } } template<class T> T* copy_construct(T* begin, T* end, T* dst) { while (begin != end) { new(dst) T(*begin); ++begin; ++dst; } return dst; }

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  • MATLAB pdist function

    - by James
    Hi, I am using the pdist command to find the distance between x and y coordinates stored in a matrix. X = [100 100; 0 100; 100 0; 500 400; 300 600;]; D = pdist(X,'euclidean') Which returns a 15 element vector. : [0.734979755525412 3.40039811339820 2.93175207511321 1.83879677592575 2.40127440268306 2.75251513299386 2.21488402640753 1.10610649500317 1.81674017301699 0.903207751535635 1.99116952754924 1.05069952386082 1.24122819418333 1.08583377275532 1.38729428638035] Is there a way to associate these distances with the coordinates they were derived from, i.e. store them in a matrix with the general row form: [Length xcoordinate1 ycoordinate1 xcoordinate2 ycoordinate2] Where there is a row for each length found? Thanks in advance

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  • how do I determine how much VRAM is in the system?

    - by Cocoa Dev
    I just bought a Samsung Series 7 laptop but I have no idea how much VRAM the graphics card has. This is an NVIDIA OPTIMUS card. I am using Windows 7 and will upgrade to 8 within the hour. I switched from Mac to PC. So its not familiar to me. I am sorry that you guys know where to look and think this question is very trivial. Someone is selling me his laptop and claims it has 1GB VRAM. The stock # says it should have 512MB and I wanted to verify these details.

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  • C++ - How to call a member function for an inherited object.

    - by Francisco P.
    Hello! I have a few classes (heat, gas, contact, pressure) inheriting from a main one (sensor). I have a need to store them in a vector<Sensor *> (part of the specification). At some point in time, I need to call a function that indiscriminately stores those Sensor *. (also part of the specification, not open for discussion) Something like this: for(size_t i = 0; i < Sensors.size(); ++i) Sensors[i]->storeSensor(os) //os is an ofstream kind of object, passed onwards by reference Where and how shall storeSensor be defined? Is there any simple way to do this or will I need to disregard the specification? Mind you, I'm a beginner! Thanks for your time!

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  • Proper use of use of "cor" function in R

    - by order
    I am interested to know what a proper x (vector matrix or data frame) input looks like. I am currently using the function in two different sorts of matrices. However, I am not sure how R would interpret my data the way I intend. I will explain the types of matrix by example. Type 1 Gene1 Gene2 Gene3 sample1 sample2 Type 2 Sample1 Sample2 Sample3 gene 1 gene 2 gene 3 Are either of these formats valid x parameters? I input both of types of matrices and get some results, but without knowing whether or not this a proper use the function, these are just random numbers. Thank you for your time. I apologize that this isn't more interesting.

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  • How would you write this Clojure snippet in Ruby and/or Haskell?

    - by dnolen
    I was working on a Rails template and was trying to write a bit of code that allows me to populate a table or multiple columns of ul tags "top-to-bottom" and "left-to-right" across however many columns I specify. I'm just getting the hang of Ruby so I couldn't figure this out. I'm also curious about an idiomatic Haskell version for this useful snippet. Improvements to Clojure version appreciated: (defn table [xs & {:keys [cols direction] :or {cols 1 direction 'right}}] (into [] (condp = direction 'down (let [c (count xs) q (int (/ c cols)) n (if (> (mod c q) 0) (inc q) q)] (apply map vector (partition n n (repeat nil) xs))) 'right (map vec (partition cols cols (repeat nil) xs))))) With this bit of code I can then do the following: (table (range 10) :cols 3) Printed out this would look like so: 0 1 2 3 4 5 6 7 8 9 And the trickier one: (table (range 10) :cols 3 :direction 'down) Looks like so: 0 4 8 1 5 9 2 6 3 7

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  • Pushing image changes to multiple servers

    - by gms8994
    I need the ability to push images out to multiple servers whenever they're updated. I've looked at Network Filesystems, but they're all but worthless due to their speed. Images can be uploaded to any one of 3 servers, and would then need to be copied to the other 2. Any suggestions? I'm open to try just about anything. EDIT: Graphics data (jpg, gif, png, etc). Linux only. We're currently using rsync. But having it work back and forth is getting cumbersome. It's all local network.

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  • C++ virtual + protected?

    - by user346113
    Hi, In C++, I have a base class A, a sub class B. Both have the virtual method Visit. I would like to redefine 'Visit' in B, but B need to access the 'Visit' function of each A (and all subclass to). I have something like that, but it tell me that B cannot access the protected member of A! But B is a A too :-P So, what can I do? class A { protected: virtual Visit(...); } class B : public class A { protected: vector<A*> childs; Visit(...); } B::Visit(...) { foreach(A* a in childs) { a->Visit(...); } } Thx

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  • C++: need indexed set

    - by user231536
    I need an indexed associative container that operates as follows: initially empty, size=0. when I add a new element to it, it places it at index [size], very similar to a vector's push_back. It increments the size and returns the index of the newly added element. if the element already exists, it returns the index where it occurs. Set seems the ideal data structure for this but I don't see any thing like getting an index from a find operation. Find on a set returns an iterator to the element. Will taking the difference with set.begin() be the correct thing to do in this situation?

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  • [C++] Why am I not getting the same values?

    - by xbonez
    I am using Bode's formuala to calculate distance of nth planet from sun dist = (4 + 3*(2^(n-2)))/10 If I calculate the distance this way, I get the right values: dist[2] = ((4 + 3*1)/10.0) ; dist[3] = ((4 + 3*2)/10.0) ; dist[4] = ((4 + 3*4)/10.0) ; But doing it this way, gives me incorrect values: vector double> dist(5); for (unsigned int i = 2; i < 5; i++) { dist[i] = ((4 + 3*(2^(3-2)))/10.0) ; } ` Why so?

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  • an issue with VMWare Workstation 10 and three monitors

    - by whtvr
    I'm having a bit of a problem with using three monitors with VMWare Workstation 10. When only two monitors are enabled in the system I have an option to "Cycle Multiple Monitors", available from the View menu (in full screen). When I enable the third monitor that option is no longer in the menu and I can only use one monitor at a time. I've found this article and a "Choose a Monitor Layout" button is mentioned there but I'm unable to see it anywhere. I'm using Windows 8.1 as the host and Ubuntu 14.04 as the guest. The graphics card is AMD Radeon R9 290x with latest beta drivers

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  • Constructor Definition

    - by mctl87
    Ok so i have a class Vector: #include <cstdlib> class Vec { private: size_t size; int * ptab; public: Vec(size_t n); ~Vec() {delete [] ptab;} size_t size() const {return size;} int & operator[](int n) {return ptab[n];} int operator[](int n) const {return ptab[n];} void operator=(Vec const& v); }; inline Vec::Vec(size_t n) : size(n), ptab(new int[n]) { } and the problem is that in one of my homework exercises i have to extend constructor def, so all elements will be initialized with zeros. I thought i know the basics but cant get through this dynamic array -.- ps. sry for gramma and other mistakes ;)

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  • How to check whether iterators form a contiguous memory zone?

    - by Vincent
    I currently have the following function to read an array or a vector of raw data (_readStream is a std::ifstream) : template<typename IteratorType> inline bool MyClass::readRawData( const IteratorType& first, const IteratorType& last, typename std::iterator_traits<IteratorType>::iterator_category* = nullptr ) { _readStream.read(reinterpret_cast<char*>(&*first), (last-first)*sizeof(*first)); return _readStream.good(); } First question : does this function seem ok for you ? As we read directly a block of memory, it will only work if the memory block from first to last is contiguous in memory. How to check that ?

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