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comparison scripts/sparse/pcr.m @ 7001:8b0cfeb06365

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[project @ 2007-10-10 18:02:59 by jwe]
author jwe
date Wed, 10 Oct 2007 18:03:02 +0000
parents 2c85044aa63f
children 93c65f2a5668
comparison
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7000:e87f860624cc 7001:8b0cfeb06365
90 ## @var{iter} is the actual number of iterations performed. 90 ## @var{iter} is the actual number of iterations performed.
91 ## 91 ##
92 ## @item 92 ## @item
93 ## @var{resvec} describes the convergence history of the method, 93 ## @var{resvec} describes the convergence history of the method,
94 ## so that @code{@var{resvec} (i)} contains the Euclidean norms of the 94 ## so that @code{@var{resvec} (i)} contains the Euclidean norms of the
95 ## residualafter the (@var{i}-1)-th iteration, @code{@var{i} = 95 ## residual after the (@var{i}-1)-th iteration, @code{@var{i} =
96 ## 1,2, @dots{}, @var{iter}+1}. 96 ## 1,2, @dots{}, @var{iter}+1}.
97 ## @end itemize 97 ## @end itemize
98 ## 98 ##
99 ## Let us consider a trivial problem with a diagonal matrix (we exploit the 99 ## Let us consider a trivial problem with a diagonal matrix (we exploit the
100 ## sparsity of A) 100 ## sparsity of A)
289 endif 289 endif
290 290
291 if (breakdown) 291 if (breakdown)
292 flag = 3; 292 flag = 3;
293 if (nargout < 2) 293 if (nargout < 2)
294 warning ("pcr: breakdown occured:\n"); 294 warning ("pcr: breakdown occurred:\n");
295 warning ("system matrix singular or preconditioner indefinite?\n"); 295 warning ("system matrix singular or preconditioner indefinite?\n");
296 endif 296 endif
297 endif 297 endif
298 298
299 endfunction 299 endfunction