You want to do something like this:
DataOut<2> data_out;
data_out.attach_dof_handler(dof_handler);
data_out.add_data_vector(solution, "solution");
data_out.build_patches();
std::ofstream output("solution.vtk");
output.set_precisition(12);
data_out.write_vtk(output);
Best,
Bruno
Le mar. 11 oct. 2022 à 00:48, Wasim Niyaz Munshi ce21d400 <
[email protected]> a écrit :
> I used this to set precision of 12 for my solution vector
> *std::cout << "Solution" << std::setprecision(12) <<solution;*
>
> I had to add the following line of code also:
> *#include <iomanip>*
>
> I tried the following to write data to vtk file with a higher
> precision(12):
> DataOut<2> data_out;
> data_out.attach_dof_handler(dof_handler);
> data_out.add_data_vector(*std::setprecision(12)* <<solution,
> "solution");
> data_out.build_patches();
>
> std::ofstream output("solution.vtk");
> data_out.write_vtk(output);
>
> But it gives the following error:
> error: no match for ‘operator<<’ (operand types are ‘std::_Setprecision’
> and ‘const dealii::Vector<double>’)
>
> Thanks
>
> On Tuesday, October 11, 2022 at 1:27:54 AM UTC+5:30 Wolfgang Bangerth
> wrote:
>
>> On 10/10/22 11:45, Wasim Niyaz Munshi ce21d400 wrote:
>> > So I used set precision function when using the cout to print the
>> > solution vector.
>> > With setprecision, the values are printed accurately to machine
>> precision.
>> > However, I was still unable to write the values accurately upto machine
>> > precision, to a vtk file.
>>
>> Did you use .setprecision(...) also on the stream that you give to
>> data_out.write_vtk()? You need to set the precision separately for each
>> stream on which you want to output.
>>
>> Best
>> W.
>>
>> --
>> ------------------------------------------------------------------------
>> Wolfgang Bangerth email: [email protected]
>> www: http://www.math.colostate.edu/~bangerth/
>>
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