Hello,

is there a simple method to save a MatrixXf and reload it on next program start?
I do some heavy computations and would like to save them.
I already tried writing the MatrixXf object to a stream, using something like:

Code: Select all

ofstream ofs("/tmp/matrix.dump", ios::binary);
ofs.write((char *)&featureArray, sizeof(featureArray));


where featureArray is of type MatrixXf
But this saves only 12byte for a 1000x300 matrix, and after loading there
are no elements in the matrix.

Ismael

We don't provide file IO, we only support printing to a c++ stream but no readback. You'll have to code that yourself!

if featureArray is of type MatrixXf, then instead of

ofs.write((char *)&featureArray, sizeof(featureArray));

you should do

ofs.write(featureArray.data(), featureArray.size() * sizeof(float));

note that a MatrixXf only contains 2 integer fields (numbers of rows and cols) and the array of coefficients. Nothing else.

Hi,

if (or better say when) you find a solution, can you post it here? I am in the same position as you are (regarding saving and loading).

Regards,
Dženan