libmesh-users

[Libmesh-users] [RB] Print solution vector as ".txt"

[<ss...@pu...>]

Hello, all.

 

To find the maximum solution value, I try to print a solution vector, e.g.,
displacement vector in linear elasticity, as text extension.

However, I was able to find only the solution with the exodus extension. 

 

This exodus extension is useful to visualize with a program like "ParaView,"
but it is complicated to compare results directly.

So I want to print solution with ".txt" as follows: 

 

(node)          (solution)

1                  0.1122

2                  0.5454

.

3224             0.5722

 

If there are multiple solutions such as 2D elasticity (displacements for x
and y directions), I want to print a text file as

 

(node)           (x)                (y)

1                  0.1122           0.5556

2                  0.5454           0.5878

.

3224             0.5722           0.4125

 

Could you please tell me some ways or ideas?

If it is impossible, I want to print the maximum solution value in
"Terminal"  using "std::cout << . << std::endl" at least.

 

I always thank you for your help.

 

Regards,

SKang

Re: [Libmesh-users] [RB] Print solution vector as ".txt"

[David K. <dav...@ak...>]

On Sun, Jul 8, 2018 at 10:53 PM, <ss...@pu...> wrote:

> Hello, all.
>
>
>
> To find the maximum solution value, I try to print a solution vector, e.g.,
> displacement vector in linear elasticity, as text extension.
>
> However, I was able to find only the solution with the exodus extension.
>
>
>
> This exodus extension is useful to visualize with a program like
> "ParaView,"
> but it is complicated to compare results directly.
>
> So I want to print solution with ".txt" as follows:
>
>
>
> (node)          (solution)
>
> 1                  0.1122
>
> 2                  0.5454
>
> .
>
> 3224             0.5722
>
>
>
> If there are multiple solutions such as 2D elasticity (displacements for x
> and y directions), I want to print a text file as
>
>
>
> (node)           (x)                (y)
>
> 1                  0.1122           0.5556
>
> 2                  0.5454           0.5878
>
> .
>
> 3224             0.5722           0.4125
>
>
>
> Could you please tell me some ways or ideas?
>
> If it is impossible, I want to print the maximum solution value in
> "Terminal"  using "std::cout << . << std::endl" at least.
>
>
>
> I always thank you for your help.
>


I gather you're asking how to write to a .txt file? That is a C++ question,
not specifically related to libMesh. I suggest you look on the web for a
tutorial for I/O, e.g. http://www.cplusplus.com/doc/tutorial/files/

Best,
David

Re: [Libmesh-users] [RB] Print solution vector as ".txt"

[<ss...@pu...>]

Thank you for your reply, David

 

I think my question was unclear.

 

My final goal is the same as the question.

However, before I print solutions using “cout” or “I/O,” I do not know which variable the solution vector is stored in.

In other words, which variable can I use to load solutions of a PDE in RB codes?

I also want to know which variable stores nodes that match the above solutions.

 

I look forward your reply.

 

Regards,

SKang

 

 

From: David Knezevic <dav...@ak...> 
Sent: Monday, July 9, 2018 9:12 PM
To: 강신성 <ss...@pu...>
Cc: libmesh-users <lib...@li...>
Subject: Re: [Libmesh-users] [RB] Print solution vector as ".txt"

 

On Sun, Jul 8, 2018 at 10:53 PM, <ss...@pu... <mailto:ss...@pu...> > wrote:

Hello, all.



To find the maximum solution value, I try to print a solution vector, e.g.,
displacement vector in linear elasticity, as text extension.

However, I was able to find only the solution with the exodus extension. 



This exodus extension is useful to visualize with a program like "ParaView,"
but it is complicated to compare results directly.

So I want to print solution with ".txt" as follows: 



(node)          (solution)

1                  0.1122

2                  0.5454

.

3224             0.5722



If there are multiple solutions such as 2D elasticity (displacements for x
and y directions), I want to print a text file as



(node)           (x)                (y)

1                  0.1122           0.5556

2                  0.5454           0.5878

.

3224             0.5722           0.4125



Could you please tell me some ways or ideas?

If it is impossible, I want to print the maximum solution value in
"Terminal"  using "std::cout << . << std::endl" at least.



I always thank you for your help.

 

 

I gather you're asking how to write to a .txt file? That is a C++ question, not specifically related to libMesh. I suggest you look on the web for a tutorial for I/O, e.g. http://www.cplusplus.com/doc/tutorial/files/

 

Best,
David

Re: [Libmesh-users] [RB] Print solution vector as ".txt"

[David K. <dav...@ak...>]

On Mon, Jul 9, 2018 at 8:43 PM, <ss...@pu...> wrote:

> Thank you for your reply, David
>
>
>
> I think my question was unclear.
>
>
>
> My final goal is the same as the question.
>
> However, before I print solutions using “cout” or “I/O,” I do not know
> which variable the solution vector is stored in.
>
> In other words, which variable can I use to load solutions of a PDE in RB
> codes?
>
> I also want to know which variable stores nodes that match the above
> solutions.
>
>
>
> I look forward your reply.
>


I'm not sure I understand what you're asking, but in general I'd suggest
you review the reduced_basis examples carefully since that should cover
what you're asking about. For example, see the "online stage" of
reduced_basis_ex1, where we do "rb_con.load_rb_solution()". This loads the
RB solution into the "solution" vector of the RBConstruction object.

Best,
David



>
>
> *From:* David Knezevic <dav...@ak...>
> *Sent:* Monday, July 9, 2018 9:12 PM
> *To:* 강신성 <ss...@pu...>
> *Cc:* libmesh-users <lib...@li...>
> *Subject:* Re: [Libmesh-users] [RB] Print solution vector as ".txt"
>
>
>
> On Sun, Jul 8, 2018 at 10:53 PM, <ss...@pu...> wrote:
>
> Hello, all.
>
>
>
> To find the maximum solution value, I try to print a solution vector, e.g.,
> displacement vector in linear elasticity, as text extension.
>
> However, I was able to find only the solution with the exodus extension.
>
>
>
> This exodus extension is useful to visualize with a program like
> "ParaView,"
> but it is complicated to compare results directly.
>
> So I want to print solution with ".txt" as follows:
>
>
>
> (node)          (solution)
>
> 1                  0.1122
>
> 2                  0.5454
>
> .
>
> 3224             0.5722
>
>
>
> If there are multiple solutions such as 2D elasticity (displacements for x
> and y directions), I want to print a text file as
>
>
>
> (node)           (x)                (y)
>
> 1                  0.1122           0.5556
>
> 2                  0.5454           0.5878
>
> .
>
> 3224             0.5722           0.4125
>
>
>
> Could you please tell me some ways or ideas?
>
> If it is impossible, I want to print the maximum solution value in
> "Terminal"  using "std::cout << . << std::endl" at least.
>
>
>
> I always thank you for your help.
>
>
>
>
>
> I gather you're asking how to write to a .txt file? That is a C++
> question, not specifically related to libMesh. I suggest you look on the
> web for a tutorial for I/O, e.g. http://www.cplusplus.com/
> doc/tutorial/files/
>
>
>
> Best,
> David
>

Re: [Libmesh-users] [RB] Print solution vector as ".txt"

[<ss...@pu...>]

Thank you very much!

 

The “rb_con.load_rb_solution()” is the answer I want.

 

I have not seen RB examples because I mistakenly thought that there was only content with exodus extension in examples.

So I have only looked at LibMesh documentation and have searched a “solution” keyword.

 

Thanks again for your kind answers to minor questions.

 

Regards,

SKang

 

From: David Knezevic <dav...@ak...> 
Sent: Tuesday, July 10, 2018 9:52 AM
To: 강신성 <ss...@pu...>
Cc: libmesh-users <lib...@li...>
Subject: Re: [Libmesh-users] [RB] Print solution vector as ".txt"

 

On Mon, Jul 9, 2018 at 8:43 PM, <ss...@pu... <mailto:ss...@pu...> > wrote:

Thank you for your reply, David

 

I think my question was unclear.

 

My final goal is the same as the question.

However, before I print solutions using “cout” or “I/O,” I do not know which variable the solution vector is stored in.

In other words, which variable can I use to load solutions of a PDE in RB codes?

I also want to know which variable stores nodes that match the above solutions.

 

I look forward your reply.

 

 

I'm not sure I understand what you're asking, but in general I'd suggest you review the reduced_basis examples carefully since that should cover what you're asking about. For example, see the "online stage" of reduced_basis_ex1, where we do "rb_con.load_rb_solution()". This loads the RB solution into the "solution" vector of the RBConstruction object.

 

Best,

David

 

 

 

From: David Knezevic <dav...@ak... <mailto:dav...@ak...> > 
Sent: Monday, July 9, 2018 9:12 PM
To: 강신성 <ss...@pu... <mailto:ss...@pu...> >
Cc: libmesh-users <lib...@li... <mailto:lib...@li...> >
Subject: Re: [Libmesh-users] [RB] Print solution vector as ".txt"

 

On Sun, Jul 8, 2018 at 10:53 PM, <ss...@pu... <mailto:ss...@pu...> > wrote:

Hello, all.



To find the maximum solution value, I try to print a solution vector, e.g.,
displacement vector in linear elasticity, as text extension.

However, I was able to find only the solution with the exodus extension. 



This exodus extension is useful to visualize with a program like "ParaView,"
but it is complicated to compare results directly.

So I want to print solution with ".txt" as follows: 



(node)          (solution)

1                  0.1122

2                  0.5454

.

3224             0.5722



If there are multiple solutions such as 2D elasticity (displacements for x
and y directions), I want to print a text file as



(node)           (x)                (y)

1                  0.1122           0.5556

2                  0.5454           0.5878

.

3224             0.5722           0.4125



Could you please tell me some ways or ideas?

If it is impossible, I want to print the maximum solution value in
"Terminal"  using "std::cout << . << std::endl" at least.



I always thank you for your help.

 

 

I gather you're asking how to write to a .txt file? That is a C++ question, not specifically related to libMesh. I suggest you look on the web for a tutorial for I/O, e.g. http://www.cplusplus.com/doc/tutorial/files/

 

Best,
David