the Matrix interface should add the Copy(or CopyTo) func

[xiaok159...@gmail.com]

If I want to copy a matrix to a dense Slice,the Eigen can do :

p.copyTo(A.rowRange(3,8).colRange(0, 4))

It's Very easy to use,
But the mat package must do that things :

p := mat.NewVector(4,mesh_points[r][:]).T()
eq := func(i,j int ,v float64) float64 {return v}
A.Slice(row_index,row_index+1,0,4).(*mat.Dense).Apply(eq,p)

If matrix interface have the copy func , It will be convenient，right？

[Dan Kortschak]

https://godoc.org/gonum.org/v1/gonum/mat#Dense.Copy

p := mat.NewVector(4, m[r][:]).T()
a.Slice(i, i+1, 0, 4).(*mat.Dense).Copy(p)

On Tue, 2017-06-27 at 00:50 -0700, xiaok159...@gmail.com wrote:
> If I want to copy a matrix to a dense Slice,the *Eigen* can do :

[Dan Kortschak]

Though this is easier, and more efficient.

a.SetRow(i, m[r][:]) 

[xiaok159...@gmail.com]

Yes ,Thank you ,i founded later,and the code an be also a.Slice(i, i+1, 0, 4).(Copyier).Copy(p) to use interface!