c*******h 发帖数: 1096 | 1 A\speye(n)
if not work or too slow, try BICG, BICGSTAB, CGS, GMRES, QMR with/without
all sorts of preconditioners |
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c*******h 发帖数: 1096 | 2 this condition number is definitely too large.
to solve your system, i suggest you look at a number of sparse solvers,
such as pcg, bicgstab, gmres etc, and see which one suits your matrix.
also, do try some pre-conditioners to lower down the condition number.
returns |
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d********o 发帖数: 59 | 3 A 是sparse, discretized from a PDE. matlab 里的 "\" 自动并行对内存要求比较大
,3D的问题解起来就不快了,bicgstab 没有preconditioner的话,也是很满,gmres好
像就根本不起作用。大家一般都用什么方法呢?有没有好的review的文章呢? |
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c*******h 发帖数: 1096 | 4 很多学校、实验室、公司都是自己写code的
在bicgstab, gmres, shur complement, AMG, 以及各种reordering和preconditioner
之间根据自己的喜好选择…… |
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