I want to express the following sum into vector product of $\beta$ and $\lambda$, where $\beta = (\beta_{1},...,\beta_{p})^{T},\lambda = (\lambda_{1},...,\lambda_{p})^{T},$:
$$sum = \sum_{k=1}^{p} \lambda_{k}\beta_{k}^{2}$$
Can anybody help?
2026-05-14 06:18:06.1778739486
How to express the following sum term into vector product?
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You can write fot instance $\mathbf{\beta}^T \mathrm{diag}(\lambda) \mathbf{\beta}$.