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Search found 5 results on 1 pages for 'jcyang'.

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• Why do we need normalized coordinate system? Options

  - by jcyang

  Hi, I have problem understand following sentences in my textbook Computer Graphics with OpenGL. "To make viewing process independent of the requirements of any output device,graphic system convert object descriptions to normalized coordinates and apply the clipping routines." Why normalized coordinates could make viewing process independent of the requirements of any output devices? Isn't the projection coordinates already independent of output device?We only need to first scale and then translate the projection coordinate then we will get device coordinate. So why do we need first convert the projection coordinate to normalized coordinate first? "Clipping is usually performed in normlized coordinates.This allows us to reduce computations by first concatenating the various transformation matrices" Why clipping is usually performed in normlized coordinates? What kind of transformation concatenated? thanks. jcyang.

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• What are the applications of binary trees?

  - by jcyang

  I am wondering what the particular applications of binary trees are. Could you give some real examples? Thanks.

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• Which programming language suits web critical application development?

  - by jcyang

  According to this page,it seems that Perl,PHP,Python is 50 times slower than C/C++/Java. Thus,I think Perl,PHP,Python could not handle critical application(such as 100 million user,xx million request every second) well.But exceptions are exist,e.g. facebook(it is said facebook is written with PHP entirely),wikipeida.Moreover,I heard google use Python extensively. So why?Is it the faster hardware fill the big speed gap between C/C++/Java and Perl/PHP/Python? thanks.

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• What are the real-world applications of huffman coding?

  - by jcyang

  I am told that Huffman coding is used as loseless data compression algorithm but also am told that real data compress software do not employ huffman coding,cause if the keys are not distributed decentralized enough,the compressed file could be even larger than the orignal file. This leave me wondering are there any real-world application of huffman coding? thanks.

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• How to make an ambiguous call distinct in C++?

  - by jcyang

  void outputString(const string &ss) { cout << "outputString(const string& ) " + ss << endl; } void outputString(const string ss) { cout << "outputString(const string ) " + ss << endl; } int main(void) { //! outputString("ambigiousmethod"); const string constStr = "ambigiousmethod2"; //! outputString(constStr); } ///:~ How to make distinct call? EDIT: This piece of code could be compiled with g++ and msvc. thanks.

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