Note that when saving a matrix to .txt with gretl, it seems the only
"problematic" part of the file is the header line like "mymatrix (2x2)".
Otherwise it's an almost perfect csv file. So as a workaround you could
comment out or delete the header.
I deleted the .txt file header file but nothing good happened ! On the other hand, I transformed the .txt file into a .csv file and it worked fine.
But what do you really want to do? If your matrices really represent
data series / variables, I think you can convert them to series via a
console command (check the user guide) and then normally save them as
series to a .gdt file.
The problem is with matrix whose rows' number exceeds the number of observation in the data file. You can't save the rows as series.
I have a 10-observation file and a 150-step loop for bootstrapping. Of course, I can use the "--progressive" flag for saving results in a .gdt file but what if one wants to store the coefficients in a 150-row matrix intoo a .gdt file? :-)

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