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you can use plain c++ std lib for this:

#include <fstream>

std::ifstream in("my.txt");
// you did not tell us, what type of data to read, i'll assume float here !
Mat m; // initially empty
// slurp in data, one at a time
for  (int i=0; i<238*51; i++)
{
    float f;
    in >> f;
    m.push_back(f);
}
m = m.reshape(1, 238); // finally, reshape to 51x238

you can use plain c++ std lib for this:

#include <fstream>

std::ifstream in("my.txt");
// you did not tell us, what type of data to read, i'll assume float here !
Mat cv::Mat m; // initially empty
// slurp in data, one at a time
for  (int i=0; i<238*51; i++)
{
    float f;
    in >> f;
    m.push_back(f);
}
m = m.reshape(1, 238); // finally, reshape to 51x238