c++ - What's the most basic way to format a 2D matrix of doubles in binary for reading into IDL? -


so have j matrix of doubles in c++ want read idl program.

lets matrix called data, size rows cols, , name string saved filename. , write values out in stream binary file.

ofstream myfile (filename, ios::binary); if(myfile.isopen()) {   (int = 0; < rows; i++){      (int j=0; j < cols; j++){           myfile<<data.at(i,j); } myfile.close();

i want read idl i'm new working binary in idl , following documentation has gotten me here it's not working. 

function read_binmatrix, filename, rows, cols, thetype      mat = read_binary(filename,data_type=thetype,data_dims=[rows-1,cols-1])     return, mat  end  ...  ... matrix = read_binmatrix(file2,num_rows,num_cols,5)

...but error output.

% read_binary: readu: end of file encountered. unit: 100, file: ... % execution halted at: read_binmatrix     21  ... 

 myfile<<data.at(i,j);

writes text file, not binary data. write numbers in binary format use std::ofstream::write():

 myfile.write(reinterpret_cast<char*>(&data.at(i,j),sizeof(decltype(data.at(i,j))));

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