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Beginner
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Low Accuracy with CG Solver ?

I am just wondering why , the CG Solver is so inaccurate and also in some cases the solver doesnt covert. So how to make the solution of x more accurate and how to set the maximum number of itereations to a higher bound. Into the attachment my adapted files from the standard example,the input are just mkl files. In some cases it works,but in most cases the obtained solution is far away from the real solution.

best regard

 

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Moderator
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It may be caused the ill-conditioning the input matrices. Have you checked these cases?

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Beginner
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na not really, do u think that those matrices from matrix market are ill conditioned ?

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Beginner
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Is it possible to say me some good parameters to improve the accuracy and conergence of the solver ?

best regards

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