Description Usage Arguments Value

The flattened vector contains all elements of the lower triangular
part of a symmetric matrix including all diagonal elements. Because
any row i of a quadratic matrix contains i elements below the
diagonal, including the diagonal element, the flattened vector of
an n * n symmetric matrix contains the sum of all natural numbers
up to and including n. That length has a closed form and corresponds
to *n*(n+1)/2*. Given the length of the flattened vector, we have
a quadratic equation for n, that can be solved. We are only interested
in the positive solution which is *n = (-1 + √(1+8l))/2*

1 | ```
nGetMatDim(pnLenFlatVec)
``` |

`pnLenFlatVec` |
length of flattened vector |

nMatDimResult dimension of symmetric matrix

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