Thanks Barry. Another question is about subroutine ComputeMatrix(ksp,JJ,jac,ctx,ierr), which is called by KSPSetComputeOperators(ksp,ComputeMatrix,ctx,ierr). In the tutorials, it seems that Mat JJ, the linear operator, is not assigned in ComputeMatrix. Only Mat jac, which supposed to be preconditioning matrix, is set. I am confused with this part. Why is the linear operator used without being set? Looking forward to your reply. Regards, Pengyang ---------------------------------------------------------------- Pengyang Song（宋朋洋） MSc candidate in Physical Oceanography College of Oceanic and Atmospheric Sciences Ocean University of China No. 238 Songling Road, Qingdao 266100, Shandong, China TEL: (+86) 15762264643
-----邮件原件----- 发件人: Smith, Barry F. <[email protected]> 发送时间: 2018年10月27日 9:02 收件人: SONG Pengyang <[email protected]> 抄送: [email protected] 主题: Re: [petsc-users] Problems with fortran subroutine DMDAVecGetArrayF90 You are calling the routine incorrectly. Take a look at usage in src/dm/examples/tutorials/ex11f90.F90 Barry > On Oct 26, 2018, at 5:16 AM, SONG Pengyang <[email protected]> wrote: > > Hi all, > I am trying to change a KSP tutorial code ex34.c to ex34f.F90. I found that > after I changed DMDAVecGetArray to DMDAVecGetArrayF90, and > DMDAVecRestoreArray to DMDAVecRestoreArrayF90. Compilation errors say that > there is no matching specific subroutine for this generic subroutine call. > Can anyone help me with the problem? > The error massage is listed below and the fortran code is also attached. Many > thanks. > > ex34f.F90(83): error #6285: There is no matching specific subroutine for this > generic subroutine call. [DMDAVECGETARRAYF90] > call DMDAVecGetArrayF90(x,array,ierr) -----------^ > ex34f.F90(91): error #6285: There is no matching specific subroutine for this > generic subroutine call. [DMDAVECRESTOREARRAYF90] > call DMDAVecRestoreArrayF90(x,array,ierr) > -----------^ > compilation aborted for ex34f.F90 (code 1) > > ---------------------------------------------------------------- > Pengyang Song（宋朋洋） > MSc candidate in Physical Oceanography College of Oceanic and > Atmospheric Sciences Ocean University of China No. 238 Songling Road, > Qingdao 266100, Shandong, China > TEL: (+86) 15762264643 > > <ex34f.F90>
