Research Article

A Polynomial Preconditioner for the CMRH Algorithm

Table 2


Algorithm No. of restarts Time (sec) Residual norm Convergence

GMRES(20) 1000 368.0310 1.8110e − 6 No
CMRH(20) 883 100.2500 8.4761e − 11 Yes
PCMRH(20) ( ) 481 57.2650 8.2944e − 11 Yes