Flexible GMRES from ITSOL developed by Yousef Saad.  
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| double | ddot_ (int *, double[], int *, double[], int *) | 
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| double | dnrm2_ (int *, double[], int *) | 
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| int | dfgmr (int n, void(*dmatvec)(double, double[], double, double[]), void(*dpsolve)(int, double[], double[]), double *rhs, double *sol, double tol, int im, int *itmax, FILE *fits) | 
|  | Simple version of the ARMS preconditioned FGMRES algorithm.  More... 
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◆ epsmac
◆ ddot_()
      
        
          | double ddot_ | ( | int * | , | 
        
          |  |  | double | [], | 
        
          |  |  | int * | , | 
        
          |  |  | double | [], | 
        
          |  |  | int * |  | 
        
          |  | ) |  |  | 
      
 
 
◆ dfgmr()
      
        
          | int dfgmr | ( | int | n, | 
        
          |  |  | void(*)(double, double[], double, double[]) | dmatvec, | 
        
          |  |  | void(*)(int, double[], double[]) | dpsolve, | 
        
          |  |  | double * | rhs, | 
        
          |  |  | double * | sol, | 
        
          |  |  | double | tol, | 
        
          |  |  | int | im, | 
        
          |  |  | int * | itmax, | 
        
          |  |  | FILE * | fits | 
        
          |  | ) |  |  | 
      
 
Y. S. Dec. 2000. – Apr. 2008
internal work arrays: vv = work array of length [im+1][n] (used to store the Arnoldi basis) hh = work array of length [im][im+1] (Householder matrix) z = work array of length [im][n] to store preconditioned vectors
- Parameters
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    | [in] | n | Dimension of vectors and matrices. |  | [in] | dmatvec | Operation for matrix-vector multiplication. |  | [in] | dpsolve | (right) preconditioning operation. Can be a NULL pointer (GMRES without preconditioner) |  | [in] | rhs | Real vector of length n containing the right hand side. |  | [in,out] | sol | In: Real vector of length n containing an initial guess to the solution on input. Out: Contains an approximate solution (upon successful return). |  | [in] | tol | Tolerance for stopping iteration |  | [in] | im | Krylov subspace dimension |  | [in,out] | itmax | In: max number of iterations allowed. Out: number of steps required to converge. |  | [in] | fits | If NULL, no output. If not NULL, file handle to output "resid vs time and its". |  
 
- Returns
- Whether the algorithm finished successfully. 
 
 
◆ dnrm2_()
      
        
          | double dnrm2_ | ( | int * | , | 
        
          |  |  | double | [], | 
        
          |  |  | int * |  | 
        
          |  | ) |  |  |