Re: [ublas] getting started?

From: djdb684_at_[hidden]
Date: 2006-05-11 00:20:49

Hi Dvir,

Your link-error is typical for the case of using the C-compiler 'gcc' instead of the C++ compiler g++.

Please try 'g++ test_b2.cpp' instead.  Your source-code worked fine for me under cygwin with GCC version 3.2.3, resulting in cout of 'm1=[3,3]((0,1,2),(3,4,5),(6,7,8))'. ( Please note that while the GNU suite of C/C++ compilers is called GCC, the C++ compiler is actually the g++.exe! )

If that's not the reason for the undefined reference please give more details about the compiler and environment that you're using.

BTW, you may also want to change the deprecated <iostream.h> header for the newer <iostream> header.  Nor is <stdio.h> needed for namespace std components; its a C header file for the likes of printf.

Best wishes, and good luck!

Dieter Beaven

---- Original message ----
>Date: Wed, 10 May 2006 14:50:27 +0300
>From: "dvir schirman" <dvir.boost_at_[hidden]>  
>Subject: [ublas] getting started?  
>To: ublas <ublas_at_[hidden]>
>
>   Hi.
>    
>   I want to use ublas in order to work with vector &
>   matrices.
>   I am working with cygwin.
>    
>   I wrote the following simple code, it compiled well,
>   but I tried to link it it has returned alott of
>   errors.
>   the first error is:
>   "/cygdrive/z/test_boost/test_b2.cpp:(.text+0xd):
>   undefined reference to `std::basic_string<char,
>   std::char_traits<char>, std::allocator<char>
>   >::size() const'"
>   And after this one there are alott of similiar ones
>   mostly regarding "std".
>    
>   Hope youy can help me with this.
>   Dvir
>    
>
>   #include
>
>   <boost/numeric/ublas/matrix.hpp>
>
>   #include
>
>   <boost/numeric/ublas/io.hpp>
>
>   #include
>
>   <boost/numeric/ublas/matrix_proxy.hpp>
>
>   #include
>
>   <iostream.h>
>
>   #include
>
>   <stdio.h>
>
>    
>
>   namespace
>
>   ublas = boost::numeric::ublas;
>
>   int
>
>   main ()
>
>   {
>
>    using  namespace boost::numeric::ublas;
>
>    using  namespace std;
>
>    
>
>    matrix<
>
>   float> m1 (3, 3);
>
>    
>
>    for
>
>   (unsigned i = 0; i < m1.size1 (); ++ i)
>
>         for (unsigned j = 0; j < m1.size2 (); ++ j)
>
>                    m1 (i, j) = 3 * i + j;
>
>   std::cout<<"m1="<<m1<<endl;
>
>   return
>
>   1;
>
>   }
>
>    
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