[petsc-users] fast multipole method using petsc

[Ji Zhang]

Dear all,

I'm a petsc user. Currently, the system I face is so huge that is out of
memory. I want to perform fast multipole method using petsc. Is it possible
for me to tell the solver the result of matrix-vector product, which is
gmres need indeed, instead of generate the whole matrix directly? For
example, give a function headle to the solver.

Thanks.

此致
    敬礼
张骥（博士研究生）
北京计算科学研究中心
北京市海淀区西北旺东路10号院东区9号楼 （100193）

Best,
Regards,
Zhang Ji, PhD student
Beijing Computational Science Research Center
Zhongguancun Software Park II, No. 10 Dongbeiwang West Road, Haidian
District, Beijing 100193, China
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