Hi, i have been compiling the examples in the chapters, but i am having problem with Matrix-matrix and matrix-vector multiplication example, this is the error

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C2039: 'ReturnType' : no es un miembro de 'Eigen::ScalarBinaryOpTraits<ScalarA,ScalarB,BinaryOp>'
1> with
1> [
1> ScalarA=double,
1> ScalarB=Eigen::Matrix2d,
1> BinaryOp=Eigen::internal::scalar_product_op<double,Eigen::Matrix2d>
1> ]
1> c:\eigen\eigen\src\core\util\meta.h(371) : vea la referencia a la creación de instancias de plantilla de clase 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>' que se está compilando
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]
1> c:\ejemplos visual\dense matrix and array manipulation\matrix and vector arithmetic\multiplicación _mxm_mxv\multiplicación _mxm_mxv\main.cpp(10) : vea la referencia a la creación de instancias de plantilla de clase 'Eigen::internal::has_ReturnType<T>' que se está compilando
1> with
1> [
1> T=Eigen::ScalarBinaryOpTraits<double,Eigen::Matrix2d,Eigen::internal::scalar_product_op<double,Eigen::Matrix2d>>
1> ]
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C2146: error de sintaxis : falta ';' delante del identificador 'result_type'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C4430: falta el especificador de tipo; se presupone int. Nota: C++ no admite default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C4430: falta el especificador de tipo; se presupone int. Nota: C++ no admite default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C4430: falta el especificador de tipo; se presupone int. Nota: C++ no admite default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C2143: error de sintaxis : falta ';' delante de '('
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C2433: 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : '__forceinline' no se permite en las declaraciones de datos
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C4430: falta el especificador de tipo; se presupone int. Nota: C++ no admite default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2327: Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : no es un nombre de tipo, elemento estático o enumerador
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C4430: falta el especificador de tipo; se presupone int. Nota: C++ no admite default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2146: error de sintaxis : falta ';' delante del identificador 'predux'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2433: 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : '__forceinline' no se permite en las declaraciones de datos
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2086: 'const int Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : nueva definición
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]
1> c:\eigen\eigen\src\core\functors\binaryfunctors.h(86) : vea la declaración de 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type'
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2238: símbolos (token) inesperados delante de ';'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C4430: falta el especificador de tipo; se presupone int. Nota: C++ no admite default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2143: error de sintaxis : falta ';' delante de '<end Parse>'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): warning C4183: 'predux': falta el tipo de valor devuelto; se supone que se trata de una función miembro que devuelve 'int'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(93): error C2143: error de sintaxis : falta ';' delante de '}'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(93): error C2238: símbolos (token) inesperados delante de ';'

I am wotking with Visual C++

Could you change the compiler output to English and also post a minimal example producing the error?
It would greatly help to test the code.

The example is the following :
#include <iostream>
#include <Eigen/Dense>
using namespace Eigen;
int main()
{
Matrix2d mat;
mat << 1, 2,
3, 4;
Vector2d u(-1,1), v(2,0);
std::cout << "Here is mat*mat:\n" << mat*mat << std::endl;
std::cout << "Here is mat*u:\n" << mat*u << std::endl;
std::cout << "Here is u^T*mat:\n" << u.transpose()*mat << std::endl;
std::cout << "Here is u^T*v:\n" << u.transpose()*v << std::endl;
std::cout << "Here is u*v^T:\n" << u*v.transpose() << std::endl;
std::cout << "Let's multiply mat by itself" << std::endl;
mat = mat*mat;
std::cout << "Now mat is mat:\n" << mat << std::endl;
}
and the error message is
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C2039: 'ReturnType' : is no a member of 'Eigen::ScalarBinaryOpTraits<ScalarA,ScalarB,BinaryOp>'
1> with
1> [
1> ScalarA=double,
1> ScalarB=Eigen::Matrix2d,
1> BinaryOp=Eigen::internal::scalar_product_op<double,Eigen::Matrix2d>
1> ]

1> c:\eigen\eigen\src\core\util\meta.h(371) : see the reference to the creation of instances of class template 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>' that is compiling
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1> c:\ejemplos visual\dense matrix and array manipulation\matrix and vector arithmetic\multiplicación _mxm_mxv\multiplicación _mxm_mxv\main.cpp(10) : see the reference to the creation of instances of class template 'Eigen::internal::has_ReturnType<T>' that is compiling
1> with
1> [
1> T=Eigen::ScalarBinaryOpTraits<double,Eigen::Matrix2d,Eigen::internal::scalar_product_op<double,Eigen::Matrix2d>>
1> ]


1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C2146: syntax error : missing ';' before identificador 'result_type'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C2143: syntax error : missing ';' before '('
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C2433: 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : '__forceinline' not permitted on data declarations
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2327: Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : is not a type name, static, or enumerator
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2146: syntax error : missing ';' before identificador 'predux'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2433: 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : '__forceinline'not permitted on data declarations
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2086: 'const int Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : redefinition
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1> c:\eigen\eigen\src\core\functors\binaryfunctors.h(86) : see declaration of 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type'
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2238:unexpected token(s) preceding 'token'';'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2143: syntax error : missing ';' before <end parse>
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2143: syntax error : missing ';' before '}'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2238:unexpected token(s) preceding 'token'';'

emilf wrote:Could you change the compiler output to English and also post a minimal example producing the error?
It would greatly help to test the code.

The example is
#include <iostream>
#include <Eigen/Dense>
using namespace Eigen;
int main()
{
Matrix2d mat;
mat << 1, 2,
3, 4;
Vector2d u(-1,1), v(2,0);
std::cout << "Here is mat*mat:\n" << mat*mat << std::endl;
std::cout << "Here is mat*u:\n" << mat*u << std::endl;
std::cout << "Here is u^T*mat:\n" << u.transpose()*mat << std::endl;
std::cout << "Here is u^T*v:\n" << u.transpose()*v << std::endl;
std::cout << "Here is u*v^T:\n" << u*v.transpose() << std::endl;
std::cout << "Let's multiply mat by itself" << std::endl;
mat = mat*mat;
std::cout << "Now mat is mat:\n" << mat << std::endl;
}

and the error is
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C2039: 'ReturnType' : is no a member of 'Eigen::ScalarBinaryOpTraits<ScalarA,ScalarB,BinaryOp>'
1> with
1> [
1> ScalarA=double,
1> ScalarB=Eigen::Matrix2d,
1> BinaryOp=Eigen::internal::scalar_product_op<double,Eigen::Matrix2d>
1> ]

1> c:\eigen\eigen\src\core\util\meta.h(371) : see the reference to the creation of instances of class template 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>' that is compiling
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1> c:\ejemplos visual\dense matrix and array manipulation\matrix and vector arithmetic\multiplicación _mxm_mxv\multiplicación _mxm_mxv\main.cpp(10) : see the reference to the creation of instances of class template 'Eigen::internal::has_ReturnType<T>' that is compiling
1> with
1> [
1> T=Eigen::ScalarBinaryOpTraits<double,Eigen::Matrix2d,Eigen::internal::scalar_product_op<double,Eigen::Matrix2d>>
1> ]


1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C2146: syntax error : missing ';' before identificador 'result_type'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(78): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C2143: syntax error : missing ';' before '('
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C2433: 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : '__forceinline' not permitted on data declarations
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(86): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2327: Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : is not a type name, static, or enumerator
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2146: syntax error : missing ';' before identificador 'predux'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2433: 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : '__forceinline'not permitted on data declarations
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2086: 'const int Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type' : redefinition
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1> c:\eigen\eigen\src\core\functors\binaryfunctors.h(86) : see declaration of 'Eigen::internal::scalar_product_op<LhsScalar,RhsScalar>::result_type'
1> with
1> [
1> LhsScalar=double,
1> RhsScalar=Eigen::Matrix2d
1> ]

1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2238:unexpected token(s) preceding 'token'';'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C4430: missing type specifier - int assumed. Note: C++ does not support default-int
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2143: syntax error : missing ';' before <end parse>
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2143: syntax error : missing ';' before '}'
1>c:\eigen\eigen\src\core\functors\binaryfunctors.h(91): error C2238:unexpected token(s) preceding 'token'';'

This works fine here using 3.3 head and various versions of gcc and clang.

This also works fine with msvc 2012, 2013, and 2015.