[petsc-dev] cheby.c

[Barry Smith]

On May 22, 2012, at 4:17 PM, Hong Zhang wrote:

> Barry,
> Do you recall the paper or detailed Chebyshev algorithm that you implemented the Chebyshev in petsc?

  No

> I added 'hybrid' to it, which is not correct. Jie is helping to fix it. Having an original
> algorithm would help. 

   The code has also heavily evolved since first being code with bells and whistles being added. 

    Perhaps look at the templates book for the definitive algorithm :-)



   Barry

> 
> On Tue, May 22, 2012 at 1:21 PM, Jie Chen <jiechen at mcs.anl.gov> wrote:
> Then do you know who wrote the code? Hong said it was you.
> 
> It was written in the 90s, before version control history. 
> Sorry, my mistake. I recall that Barry said that he wrote it when Jed was in dia... ;-(
> Hong 
>  
> 
> Hong is trying to modify the code but there is something wrong. I am helping to see what is the problem. The code itself is fine. 
> 
> Hard to speculate without more than "something wrong".
>  
> 
> Jie
> 
> 
> 
> ----- Original Message -----
> From: "Jed Brown" <jedbrown at mcs.anl.gov>
> To: "Jie Chen" <jiechen at mcs.anl.gov>, "For users of the development version of PETSc" <petsc-dev at mcs.anl.gov>
> Sent: Tuesday, May 22, 2012 1:18:07 PM
> Subject: Re: cheby.c
> 
> 
> On Tue, May 22, 2012 at 12:37 PM, Jie Chen < jiechen at mcs.anl.gov > wrote:
> 
> 
> Jed, I am reading your implementation of the chebyshev code. The algorithm does not seem to be the same as the version I am familiar with. Did you implement it according to some paper or book?
> 
> 
> 
> I didn't write it.
> 
> 
> What do you find strange?
> 
>