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September 2008

3 participants
2 discussions

multiplying a matrix with 0 makes it become a scalar 0
by dummy-address＠web.de 21 Sep '08

21 Sep '08

Hi! symbol a("a"), b("b"), c("c"); matrix blah(3,1); blah = a,b,c; cout << "blah: " << blah << endl; //output: // blah: [[a],[b],[c]] cout << "3*blah: " << 3*blah << endl; //output: // 3*blah: 3*[[a],[b],[c]] cout << "(3*blah).evalm(): " << (3*blah).evalm() << endl; // output: // [[3*a], [3*b], [3*c]] cout << "0*blah: " << 0*blah << endl; // output: // 0 cout << "(0*blah).evalm(): " << (0*blah).evalm() << endl; // output: // 0 I don't like this behaviour. Is it supposed to be that way or is this a bug? Is there a nice way to prevent a matrix from losing its row and column information? Regards Al Capone

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solving differential equatrions symbolically or numerically with C++
by Alessandro Bernardini 01 Sep '08

01 Sep '08

Hello, I am looking for a C++ library for doing symbolic or numeric computations within C++ programs. I would like a class that provides usefull tools for scientific computing (symbolic and numeric computations). I woluld like tools like in Mathematica (or Maple), but in a C++ class library !! Of particular importance is the solution of differential equations (symbolically or numerically; for ODEs or PDEs), so as variable precision arithmetic. Of course symbolic sympflification is very important. Is GiNaC the right tool for me, for doing symbolic computing and solving differential equations ? Or SymbolicC++ ? Can this libraries be an alternative to the functionality of mathematica (when used in C++ programs of course ... ) ? Thank you very very much for a short answer ... Alex.

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