ao-matrices in binary format

[Florian Schiffmann]

Dear Karl,

from the input the only option is to get it as a text file.  The simplest 
solution to your problem is to write a converter for the data in the file. 
If you are up for a little challenge you might have to get into the source 
of cp2k. 
The KS matrix is stored as a dbcsr (sparse matrix). There is a routine 
which can perform a binary write of a sparse matrix cp_dbcsr_binary_write. 
However, the format it uses retains sparsity and will therefore be very 
complicated to read in again.
If you really want cp2k to write it, I would go to qs_scf_post_gpw.F. At 
about line 2840 is where it writs out the matrix. Here you will need to 
replace the cp_dbcsr_write_sparse_matrix part.
At first you will need to convert the dbcsr ks matrix into a full matrix 
(fm_type). This is a bit of a pain (create the fm_struct, create the fm, 
transfer dbcsr to fm) but an example can be found in the same file in the 
subroutine qs_scf_post_molopt. As the KS matrix is symmetric (only half of 
it is stores) you might have to use the function cp_fm_upper_to_full to 
make sure it contains all entries
Finally use the function cp_fm_write_unformatted to dump it to file. 

Hope that helps

Flo
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