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tutorial: extend casting section with set

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Gael Guennebaud 2008-11-20 11:01:17 +00:00
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doc/QuickStartGuide.dox
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@ -190,13 +190,21 @@ v = 6 6 6
\subsection TutorialCasting Casting
In Eigen, any matrices of same size and same scalar type are all naturally compatible. The scalar type can be explicitely casted to another one using the template cast() function:
In Eigen, any matrices of same size and same scalar type are all naturally compatible. The scalar type can be explicitely casted to another one using the template MatrixBase::cast() function:
\code
Matrix3d md(1,2,3);
Matrix3f mf = md.cast<float>();
\endcode
Note that casting to the same scalar type in an expression is free.
The sizes of a resizable destination matrix can be changed automatically using the Matrix::set() function:
\code
MatrixXf res(10,10);
Matrix3f a, b;
res = a + b; // does not work (no automatic resizing)
res.set(a+b); // OK
\endcode
\subsection TutorialMap Map
Any memory buffer can be mapped as an Eigen expression: