Optimally scaled and optimally conditioned Vandermonde and Vandermonde-like matrices |
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Authors: | Email author" target="_blank">Walter?GautschiEmail author |
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Institution: | 1.Department of Computer Sciences,Purdue University,West Lafayette,USA |
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Abstract: | Vandermonde matrices with real nodes are known to be severely ill-conditioned. We investigate numerically the extent to which the condition number of such matrices can be reduced, either by row-scaling or by optimal configurations of nodes. In the latter case we find empirically the condition of the optimally conditioned n×n Vandermonde matrix to grow exponentially at a rate slightly less than \((1+\sqrt{2})^{n}\). Much slower growth—essentially linear—is observed for optimally conditioned Vandermonde-Jacobi matrices. We also comment on the computational challenges involved in determining condition numbers of highly ill-conditioned matrices. |
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