LEPDS:

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   Solves the problem ax = b when a is positive definite symmetric
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   Form:
   [x, err] = LEPDS( a, b )
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   Inputs
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   a           (n,n)   Positive definite matrix
   b           (n,1)   Right hand side

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   Outputs
   -------
   x           (n,1)   Solution
   err                 Error

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