As the theme side, i gives a vector to a DataOut<dim> object, the type of the
vector entry is double, with 15 effective digit. But there is only 6 digit
when write to a file (vtk or gpl). My vector is around 1647.99932xxxx, the
result write into the file is 1648. How can i improve the presion of the
result in file?
You probably just need to call
output_file_stream.precision(12);
before calling
data_out.write_vtk(output_file_stream);
This should make sure that output is written with 12 digits rather than C++'s
default of 6 digits.
That said, do you really need this many digits of accuracy? It is very
difficult to solve PDEs to more than, say, 4 digits of accuracy. As a
consequence, it would surprise me if you actually need more accuracy than just
the default 6 digits in your output files.
Best
W.
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Wolfgang Bangerth email: bange...@colostate.edu
www: http://www.math.colostate.edu/~bangerth/
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