Dear Bruno,
I am so sorry. My problem is:
I add a function to read the solution from outside:
template <int dim>
void Step6<dim>::read_solution (const unsigned int cycle) const
{
int n = 0;
ifstream File;
File.open("solution-" + std::to_string(cycle) + ".txt");
while(!File.eof())
{
File >> solution[n];
n++;
}
File.close();
}
But the error says:
error:
invalid operands to binary expression ('std::__1::ifstream' (aka
'basic_ifstream<char>') and 'double')
File >> solution[n];
~~~~ ^ ~~~~~~~~~~~
I want to know how to fix it, and my "solution-…txt” is something like this:
"1.373e-03 0.000e+00 7.559e-04 0.000e+00 7.559e-04 4.303e-04 0.000e+00
2.336e-03 1.252e-03 0.000e+00 1.892e-03 1.024e-03 0.000e+00”.
Thanks for your time.
Best
John
> 在 2019年2月23日，上午1:31，Bruno Turcksin <[email protected]> 写道：
>
> John,
>
> You say that you have a problem but you don't say what it is. There is no way
> we can help you if you don't tell us what's wrong.
>
> Best,
>
> Bruno
>
> On Friday, February 22, 2019 at 9:42:22 AM UTC-5, yswang wrote:
> Dear Paul,
>
> Thanks for your quick response. My “solution-…txt” file is created from other
> language (Julia), just an array. I want to use deal ii to get mesh, then
> solve the minimization problem in Julia language on the mesh, and then do
> mesh refinement according to the solution by using deal ii again.
> I read the block_write() just now, It says that “This is done in a binary
> mode, so the output is neither readable by humans nor (probably) by other
> computers using a different operating system or number format.”, so I think
> it is not what I want.
>
> Best,
> John
>
>> 在 2019年2月22日，下午9:05，Jean-Paul Pelteret <[email protected]
>> <mailto:[email protected]>> 写道：
>>
>> Dear John,
>>
>> You don’t say how you write this "solution-…txt” file, so its difficult to
>> say exactly what the best course of action is. Do you know about the
>> block_write()
>> <https://www.dealii.org/9.0.0/doxygen/deal.II/classVector.html#aef98e4994a6c0b20bb33b0290f8d607c>
>> and block_read()
>> <https://www.dealii.org/9.0.0/doxygen/deal.II/classVector.html#a57d77409b8591a13d5ee10c2e705593a>
>> functions? It looks to me like these already do what you’re trying to
>> implement here.
>>
>> I hope that this helps.
>>
>> Best,
>> Jean-Paul
>>
>>> On 22 Feb 2019, at 09:13, [email protected]
>>> <mailto:[email protected]> wrote:
>>>
>>> Dear all,
>>>
>>>
>>> I am a beginner of deal ii and C++. I want to modify some codes in step-6.
>>> I want to load the solution from outside but I meet some problem and have
>>> no idea how to fix it. The following is my modification, I just add a
>>> function:
>>>
>>> template <int dim>
>>>
>>> void Step6<dim>::read_solution (const unsigned int cycle) const
>>>
>>> {
>>>
>>> int n = 0;
>>>
>>>
>>> ifstream File;
>>>
>>> File.open("solution-" + std::to_string(cycle) + ".txt");
>>>
>>> while(!File.eof())
>>>
>>> {
>>>
>>> File >> solution[n];
>>>
>>> n++;
>>>
>>> }
>>>
>>>
>>> File.close();
>>>
>>> }
>>>
>>> Thanks for your time and I know it’s a simple question.
>>>
>>>
>>> Bests,
>>>
>>> John
>>>
>>>
>>> --
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>>
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>
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