CPPLapack Code

*bug fix on dsymatrix::set function. Thanks, Hui Li!!
*change the return object type of zero,initialize,and set functions
to enable quick initialization like ...
const dgematrix A(dgematrix(3,3).zero().set(1,1,x));

*add cap to dcovector and drovector for frexable stretching

The trunk cpplapack source code was added.