Re: [Lapackpp-devel] How to write and read the matrix on hard disk efficiently?

[Christian S. <sti...@tu...>]

Hi,

Am Sonntag, 12. M=810=8A1rz 2006 06:52 schrieb Cheng Guo:
> In my program, large LaGenMatDouble matrices will be wrote on the hard
> disk frequently for later use. I know that the "<<" operator has been
> overload to write the matrix to text files, but I think this would be
> less efficient than to write/read the matrix to/from binary files.Does
> directly writing the LaGenMatDouble matrix to a binary file saves all
> the information about the matrix or otherwise how to write and read the
> matrix on hard disk efficiently?

I'm not sure what kind of "binary file writing" you expect. The operator<<(=
)=20
has been overloaded so that writing the matrix to somewhere would work in t=
he=20
first place -- if operator<<() didn't exist, writing a matrix would not wor=
k=20
at all. So: A normal C++ class doesn't support any kind of "writing to file=
",=20
neither binary nor text. For you convenience LaGenMatDouble offers you the=
=20
operator<< to write in text format to a file. If you additionally need to=20
write in binary format, you need to write your own method to do so. Shouldn=
't=20
be too difficult, though -- simply iterate over all matrix elements. But=20
there is no standard way to do this, so you need to come up with your own=20
binary format anyway. Again: No such thing currently exists in lapack++, so=
=20
you have to write these methods on your own anyway.

Christian