What are the different methods to find approximate solution of an underdetermined system?

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R. C. Mittal

Suppose rank(A) = m , m

Harald Lang

What do you mean by "approximate"? There are infinitely many exact solutions.

Chitta Behera

Thanks Gentleman. sorry for wording .Here i mean how to find solution of under determined system. let say my dim(A)- 40*1800, dim(x)-1800*1 and dim(b)-40*1. so in this case what are the best way to find solution .